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Patent applications and USPTO patent grants for Spangler; Richard M..The latest application filed is for "programmable calculator having extended input/output capability".
Patent | Date |
---|---|
Programmable calculator having extended input/output capability Grant 4,127,897 - Spangler , et al. November 28, 1 | 1978-11-28 |
Programmable calculator including terminal control means Grant 4,126,898 - Spangler , et al. November 21, 1 | 1978-11-21 |
Programmable calculator Grant 4,012,725 - Spangler , et al. March 15, 1 | 1977-03-15 |
Subroutine Call And Return Means For An Electronic Calculator Grant 3,693,162 - Spangler September 19, 1 | 1972-09-19 |
Electronic Calculator Grant 3,678,466 - Spangler July 18, 1 | 1972-07-18 |
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