US3387693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard with keys of transparent material
Assignee: Wirth Gallo and Co
•
Filing: 1966-12-20
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Granted: 1968-06-11
•
Expires: 1986-12-20
Abstract
No abstract record available.
Inventors
- 👤 Wirth Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:58
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/22; B; B41; B41J; B41J5/00; B41J5/08; B41J5/12; G; G01; G01G; G01G23/00; G06; G06C; G06C7/00; G06C7/02; H01; H01H; H01H13/00; H01H13/02; H01H13/023; H01H13/70; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20468
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US430774A
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US2228780A
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US867868A
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US1286769A
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US3237591A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |