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 |
| 3937939 | (none) | January 7, 1974 | February 10, 1976 | Frenkel | - | Single-hand digital calculator | Calculator pen; two opposing rows of leys allow calculator to be used while held with one hand |
| 4007364 | Hoshedenki-Seizo | May 2, 1974 | February 8, 1977 | Ojima | - | Writing instrument with calculator | Calculator pen; rotary switch used to select number or function |
| 4029915 | Hoshidenkiseizo | December 12, 1974 | June 14, 1977 | Ojima | Calcu-pen | Miniaturized calculator keyboard switch assembly having universally pivoted key actuators | “Calcu-pen” with its “Quadraplane” four-way rocker switches |
| 4128889 | Hoshidenki-Seizo | June 28, 1976 | December 5, 1978 | Ojima | - | Pen type electronic digital calculator | Calculator pen; three rows of keys |
| 4141073 | (none) | August 8, 1977 | February 20, 1979 | Tan | - | Keyless electronic calculating pen | Calculator pen; interprets key strokes |
| 4404643 | Hosiden Electronics Co. | February 27, 1980 | September 13, 1983 | Ojima | - | Portable electronic calculator with a writing instrument | (calculator pen) |
| 6104603 | (none) | January 6, 1999 | August 15, 2000 | Wang | - | Electronic pen calculator | (calculator pen) |
Last updated November 5, 2006
