Patent US2106985A successfully refreshed from Google Patents.
Patent US3588820A successfully refreshed from Google Patents.
US3588820A
Expired / Lapsed
US
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Character checking apparatus for optical character generator
Assignee: International Business Machines Corp
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Filing: 1969-01-15
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Granted: 1971-06-28
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Expires: 1989-01-15
Abstract
Abstract AN OPTICAL CHARACTER GENERATOR IS IMPROVED BY PROVIDING CHECKING BITS FOR THE CHARACTERS OF THE CHARACTER MASK. THE CHECKING BITS ARE SENSED ON THE OUTPUT SIDE OF THE CHARACTER GENERATOR AND ARE COMPARED WITH A CHARACTER ADDRESS SUPPLIED TO THE CHARACTER GENERATOR. A MISMATCH BETWEEN THE ADDDRESS OF THE SELECTED CHARACTER AND THE CHECKING BITS SENSED AT THE CHARACTER GENERATOR OUTPUT SIGNIFIES A FAILURE IN THE CHARACTER GENERATOR OR THE ASSOCIATED APPARATUS.
Inventors
- 👤 Richard O Cobb
- 👤 James Lipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:06
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/045; G02; G02F; G02F1/00; G02F1/29; G02F1/31; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/1608; G06F11/1616
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |