This compilation Copyright (C) 2005 Mike Sebastian. No copyright claim is made to original U.S. Government works.
| U.S. Patent No. | Assignee | File Date | Issue Date | Inventor1 | Product | Title | Comments |
| 3973111 | Sharp | July 19, 1973 | August 3, 1976 | Washizuka | - | Calculator having thermal printing head | Exposed print head to print in a stamp-like fashion |
| 3986014 | Sharp | July 17, 1972 | October 12, 1976 | Katsui | - | Hood structure for electronic calculators | - |
| 4020467 | Sharp | September 28, 1973 | April 26, 1977 | Hashimoto | - | Miniaturized key entry and translation circuitry arrangement for a data processing unit | Buffering of input keystrokes before translation into internal representation |
| 4074118 | Sharp | October 6, 1972 | February 14, 1978 | Washizuka | - | Calculator construction | - |
| 4081664 | Sharp | April 11, 1975 | March 28, 1978 | Washizuka | - | Calculator operation time period counter in a combination of electronic timepiece and electronic calculator | - |
| 4086655 | Sharp | December 22, 1975 | April 25, 1978 | Tanimoto | - | Combination timepiece and calculator including slidable keyboard means | Calculator watch with keyboard sliding under watch body |
| 4099177 | Sharp | August 11, 1975 | July 4, 1978 | Maekawa | - | Keyboard entry circuitry of the key strobing type | Faster keyboard scanning technique |
| 4103208 | Sharp | October 31, 1975 | July 25, 1978 | Washizuka | - | Fluorescent tube display calculator | A single module incorporating both the flourscent display and calculator chip |
| 4104727 | Sharp | September 23, 1975 | August 1, 1978 | Washizuka | - | Liquid crystal display calculator construction | See 4192060 |
| 4104728 | Sharp | June 6, 1973 | August 1, 1978 | Kasubuchi | - | Electronic apparatus equipped on a flexible substratum | Calculator components bonded to a flexible PCB |
| 4120036 | Sharp | September 5, 1975 | October 10, 1978 | Maeda | - | Time information correction in combination timepiece and calculator | - |
| 4145120 | Sharp | September 19, 1975 | March 20, 1979 | Kubota | - | Electronic table calculator using liquid crystal display | Construction technique where calculator chip is bonded directly to one of the glass plates forming the LCD |
| 4158230 | Sharp | October 15, 1976 | June 12, 1979 | Washizuka | - | Electronic calculator with no protruding key tops | - |
| 4181959 | Sharp | November 30, 1976 | January 1, 1980 | Tateishi | - | Stored information transferable means for a combined electronic digital scale and calculator | Calculator that can measure distances with incorporated tape measure |
| 4181960 | Sharp | November 29, 1976 | January 1, 1980 | Tateishi | - | Tape reel and detector assembly for an electronic combined digital scale and calculator | Tape measure |
| 4185169 | Sharp | February 4, 1977 | January 22, 1980 | Tanimoto | - | Synthetic-speech calculators | - |
| 4189912 | Sharp | May 31, 1976 | February 26, 1980 | Washizuka | - | Combination calculator and timepiece | Double-sided device with calculator on one side and digital clock on the other |
| 4192060 | Sharp | September 23, 1975 | March 11, 1980 | Washizuka | - | Method of constructing liquid crystal display | See 4104727 |
| 4195348 | Sharp | February 22, 1977 | March 25, 1980 | Kakutani | - | Combined electronic digital scale and calculator storing selectable programs | Tape measure, functions to compute area and volume |
| 4209735 | Sharp | September 29, 1976 | June 24, 1980 | Yoshida | - | Solar battery powered electronic calculator | - |
| 4211892 | Sharp | February 15, 1977 | July 8, 1980 | Tanimoto | - | Synthetic-speech calculators | - |
| 4213035 | Sharp | December 10, 1976 | July 15, 1980 | Washizuka | - | Electronic combined protractor and calculator capable of measuring length and angle of an object | Tape measure, protractor |
| 4231098 | Sharp | September 9, 1974 | October 28, 1980 | Tanimoto | - | Casing of electronic calculators | - |
| 4236152 | Sharp | November 12, 1977 | November 25, 1980 | Mazuzawa | - | Readout means of a calculator operatively associated with a home tv image screen | Tv used for optional display |
| 4259668 | Sharp | May 15, 1978 | March 31, 1981 | Nishimura | - | Television set/calculator interface including exchangeable keyboard panel and program memory cartridge | - |
| 4271404 | Sharp | March 29, 1977 | June 2, 1981 | Tanaka | - | Power supply controller in a keyboard-equipped apparatus such as an electronic calculator | Power supply circuit capable of scanning a keyboard matrix to reapply power to remainder of device when key is pressed |
| 4276444 | Sharp | March 15, 1977 | June 30, 1981 | Tanimoto | - | Synthetic-speech calculators | - |
| 4282404 | Sharp | February 4, 1977 | August 4, 1981 | Tanimoto | - | Synthetic-speech calculators | - |
| 4298865 | Sharp | July 26, 1978 | November 3, 1981 | Masuzawa | - | Display device for electronic calculator or the like | Dot-matrix display with ability of displayed data to be scrolled |
| 4306294 | Sharp | September 14, 1978 | December 15, 1981 | Hashimoto | - | Combined electronic calculator and electronically tuning radio receiver | - |
| 4314115 | Shin-Etsy Polymer Co., Ltd. | July 4, 1979 | February 2, 1982 | Sado | - | Key-board switching unit | Conductive traces on the elastomer key pad are utilized as jumpers, instead of using double-sided PCB or other means |
| 4316081 | Sharp | March 2, 1978 | February 16, 1982 | Washizuka | - | Electronic digital tape measure having flexible measuring tape | - |
| 4334279 | Sharp | April 11, 1979 | June 8, 1982 | Miyakoshi | - | Display device for electronic calculators or the like | Formula prompting/parsing |
| 4336530 | Sharp | April 6, 1978 | June 22, 1982 | Koike | - | Thin keyboard with changeable key indicia | Function switch moves plate to display different key legends |
| 4366477 | Sharp | April 17, 1979 | December 28, 1982 | Iwase | - | Dot matrix type running display panel for use in electronic calculators and the like | Scrolling single line dot-matrix LCD |
| 4396941 | Sharp | May 15, 1978 | August 2, 1983 | Nishimura | - | Combined television receiver/recorder/calculator | - |
| 4412210 | Sharp | November 1, 1976 | October 25, 1983 | Washizuka | - | Electronic calculator with acoustic confirmation of key actuation and acoustical alarms | - |
| 4447889 | Sharp | June 30, 1980 | May 8, 1984 | Haneda | - | Method for controlling display of output of a programmable device | Output to printer when one is attached to pocket computer |
| 4523858 | Sharp | March 4, 1982 | June 18, 1985 | Nishimura | - | Combined electronic calculator and electronic alarm timepiece | - |
| 4531194 | Sharp | November 11, 1981 | July 23, 1985 | Morino | PC-1500? | Tape recorder drive system in a programmable electronic calculator | - |
| 4540180 | Sharp | August 20, 1982 | September 10, 1985 | Morita | - | Electronic target hunting game apparatus | Calculator/game; game involving searching for a target in a virtual matrix (maybe like a sub-hunt type game) |
| 4554641 | Sharp | February 19, 1980 | November 19, 1985 | Haneda | - | Programmable calculator | Calculator capable of displaying annotations along with numeric data |
| 4569029 | Sharp | September 18, 1981 | February 4, 1986 | Hatta | - | Check calculator | Checkbook calculator |
| 4577286 | Sharp | January 8, 1983 | March 18, 1986 | Yoshimura | - | Solar energy-powered calculator or the like | - |
| 4587409 | Sharp | November 30, 1982 | May 6, 1986 | Nishimura | - | Information processing device | Checkbook calculator that also maintains credit card balance data |
| 4608557 | Sharp | September 10, 1982 | August 26, 1986 | Nakanishi | - | Graph-drawing machine | Calculator with integrated graphics printer for drawing simple statistical charts |
| 4609918 | Sharp | September 10, 1982 | September 2, 1986 | Nakanishi | - | Graph-drawing machine | Calculator with integrated graphics printer for drawing simple statistical charts |
| 4617650 | Sharp | August 3, 1982 | October 14, 1986 | Morino | - | Memory module for a programmable electronic device | - |
| 4618927 | Sharp | May 24, 1982 | October 21, 1986 | Hatta | - | Electronic game apparatus | Game-calculator |
| 4627736 | Sharp | June 15, 1982 | December 9, 1986 | Komaki | - | Thin card-like electronic apparatus | Thin LCD calculator |
| 4630222 | Sharp | October 22, 1981 | December 16, 1986 | Yoshida | - | One chip integrated circuit for electronic apparatus with means for generating sound messages | - |
| 4636970 | Sharp | November 24, 1981 | January 13, 1987 | Morino | PC-1500? | Personal type computer with execution of programs in ROM and RAM | - |
| 4640994 | Sharp | January 24, 1983 | February 3, 1987 | Komaki | - | Electronic apparatus with a flat panel keyboard unit | Thin LCD calculator |
| 4646307 | Sharp | June 22, 1983 | February 24, 1987 | Nishimura | - | Memory contents confirmation | Detection of memory corruption caused by power cycle or battery replacement |
| 4647911 | Sharp | April 30, 1980 | March 3, 1987 | Maegawa | - | Calculator with definable keys | Software definable function keys for programmable calculator or handheld computer |
| 4651294 | Sharp | May 27, 1983 | March 17, 1987 | Washizuka | - | Electronic function calculator with improved functional command entry | Use prior result in formula calculator |
| 4695976 | Sharp | September 8, 1982 | September 22, 1987 | Nakanishi | - | Combined electronic table preparation and graph drawing apparatus | Calculator with integrated graphics printer for drawing simple statistical charts |
| 4695983 | Sharp | May 30, 1983 | September 22, 1987 | Oda | - | Calculator or pocket computer with selectable operational sequence | - |
| 4707794 | Sharp | March 13, 1979 | November 17, 1987 | Hashimoto | - | Playback operation circuit in synthetic-speech calculator | - |
| 4718029 | Sharp | November 18, 1981 | January 5, 1988 | Morino | PC-1500 class machine | Display device for a programmable electronic calculator | Single-line LCD with multi-line buffer; keyboard macros |
| 4724527 | Sharp | November 5, 1982 | February 9, 1988 | Nishimura | - | Electronic personal asset control device | Checkbook calculator |
| 4727502 | Sharp | July 12, 1982 | February 23, 1988 | Katsura | - | Programmable electronic calculator | Comment insertion/storage |
| 4760918 | Sharp | October 20, 1981 | August 2, 1988 | Washizuka | - | Pocketbook type electronic apparatus | Pocket notebook with calculator as one of the covers |
| 4763292 | Sharp | April 14, 1982 | August 9, 1988 | Kotani | - | Printer controller | Improved logic for printing to avoid printing erroneous function entries, and to print numbers as entered before normalization |
| 4796215 | Sharp | May 22, 1984 | January 3, 1989 | Hatta | - | Programmable calculator with external memory module and protection against erroneous erasure of data in the module | - |
| 4805136 | Sharp | November 9, 1981 | February 14, 1989 | Morino | - | Program protection in a programmable electronic calculator | - |
| 4811257 | Sharp | March 13, 1984 | March 7, 1989 | Sumitani | PC-1260? | Electronic calculator having means for directly inputting variables int a presored and displayed equation | - |
| 4866650 | Sharp | October 21, 1986 | September 12, 1989 | Oba | EL-9000? | Electronic calculator having matrix calculations | - |
| 4890832 | Sharp | October 5, 1982 | January 2, 1990 | Komaki | - | Compact electronic apparatus with removable processing units | Removable keyboard/processor unit plugs into main unit containing the display and batteries |
| 4897800 | Sharp | September 8, 1982 | January 30, 1990 | Nakanishi | - | Electronic graph drawing apparatus | Calculator with integrated graphics printer for drawing simple statistical charts |
| 4908786 | Sharp | October 17, 1986 | March 13, 1990 | Kuno | EL-5200/EL-9000? | Electronic calculator having graph displaying function | - |
| 5065359 | Sharp | November 18, 1988 | November 12, 1991 | Koumo | - | Desk top calculator with access sequence control system for various constants | Method of using previously accessed ROM constant in subsequent calculation |
| 5079732 | Sharp | April 28, 1989 | January 7, 1992 | Koumo | - | Multi-function electronic desk calculator | Sexagesimal entry method |
| 5203001 | Sharp | April 27, 1987 | April 13, 1993 | Yanagiuchi | - | Portable computer having an updatable table of starting addresses for accessing those stored programs having been previously executed | BASIC programs in handheld computer can be assigned to programmable function key |
| 5245536 | Sharp | November 9, 1989 | September 14, 1993 | Hsieh | - | Portable electronic financial calculator and planner | - |
| 5309380 | Sharp | July 31, 1991 | May 3, 1994 | Satoh | - | Computer display for input and display of improper and mixed fractions | Fraction calculator with display of numerator over denominator |
| 5335193 | Sharp | January 25, 1992 | August 2, 1994 | Kawawaki | - | Scientific calculator with coordinate transformation and single line numeric value display | - |
| 5371694 | Sharp | May 1, 1993 | December 6, 1994 | Kawawaki | - | Scientific calculator | Access of unit conversion functions using a 2-digit code |
| 5381353 | Sharp | June 10, 1992 | January 10, 1995 | Oba | EL-9200? | Scientific calculator for performing mathematical operations with predetermined priority | - |
| 5432721 | Sharp | December 28, 1992 | July 11, 1995 | Satoh | - | Device and method of displaying mathematical expression for small electronic appliance | Method for displaying mathematical expressions requiring more vertical space than available on the display |
| 5455905 | Sharp | July 13, 1992 | October 3, 1995 | Kaya | - | Electronic communication device for communication between and overhead projection display device and an input devece therefor | Graphing calculator overhead projector display, only keycodes transmitted from calculator to display |
| 5519646 | Sharp | July 15, 1993 | May 21, 1996 | Uemura | - | Calculator with display of processing formulas as processing progresses | Calculator with equation display displays partial results when they can be calculated |
| 5557718 | Sharp | May 23, 1994 | September 17, 1996 | Tsuneyoshi | - | Information processing apparatus having a function of displaying a plurality of graphs | Graphing calculator capable of displaying overlapping functions plotted with different scales |
| 5586060 | Sharp | June 25, 1993 | December 17, 1996 | Kuno | - | Compact electronic equipment having a statistical function | Statistical graphs |
| 5601489 | Sharp | October 13, 1982 | February 11, 1997 | Komaki | - | Compact electronic apparatus with removable processing units | Removable keyboard/processor unit plugs into main unit containing the display and batteries |
| 5680638 | Sharp | August 5, 1994 | October 21, 1997 | Satoh | - | Mathematical expression input apparatus | Calculator with context sensative data/expression entry |
| 5712656 | Sharp | July 10, 1995 | January 27, 1998 | Ikeda | - | Graphic drawing apparatus | (graphing calculator) |
| 5732001 | Sharp | September 13, 1994 | March 24, 1998 | Nakayama | - | Calculator with stepwise display of linear equations | - |
| 5758035 | Sharp | November 30, 1992 | May 26, 1998 | Tsuneyoshi | - | Graphic plotting apparatus plotting diagram represented by function and graphic plotting method thereof | (graphing calculator) |
| 5825001 | Sharp | December 22, 1995 | October 20, 1998 | Oba | - | Function calculator with graphic chart facility | Graphing calculator cursor changes when tracing a curve at an intersection of another function, a minimum, a maximum, or an inflection point |
| 5943247 | Sharp | May 7, 1996 | August 24, 1999 | Kaya | - | Electronic desk calculator with counter and counter display | Entry counter |
| 6081819 | Sharp | May 9, 1997 | June 27, 2000 | Ogino | - | Electronic calculator with graph displaying function | Ability to store screen images in RAM |
| 6104411 | Sharp | April 16, 1997 | August 15, 2000 | Ito | - | Electronic computing apparatus having graph displaying function and method for displaying graph | Method of selecting the quadrant and scale of he displayed graph on a graphing calculator |
| 6133924 | Sharp | April 3, 1997 | October 17, 2000 | Ito | - | Calculator | Graphing calculator with keys to change x and y ranges for plotted functions |
| 6195671 | Sharp | April 16, 1997 | February 27, 2001 | Ito | - | Electronic computing apparatus having arithmetic processing function and arithmetic processing method | Graphing calculator with pen (touch screen) input |
| 6243726 | Sharp | April 14, 1997 | June 5, 2001 | Satoh | - | Electronic calculating apparatus utilizing input and display of expressions in textbook and single line forms | - |
| 6362812 | Sharp | January 19, 1998 | March 26, 2002 | Shiraki | - | Electronic device and display system employing the same | Graphing calculator overhead projector display |
Last updated November 5, 2006
