Patent US3056030A successfully refreshed from Google Patents.
US3056030A
Expired / Lapsed
US
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Light responsive photo-optical keyboard
Assignee: Unisys Corp
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Filing: 1960-08-31
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Granted: 1962-09-25
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Expires: 1980-08-31
Abstract
No abstract record available.
Inventors
- 👤 Harley E Kelchner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:16
CPC Classifications
B; B41; B41J; B41J5/00; B41J5/08; H; H03; H03K; H03K17/00; H03K17/94; H03K17/965; H03K17/968; H03K17/969
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220427A
Cited
US2432527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |