US3478857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard pushbutton return spring
Assignee: Lear Siegler Inc
•
Filing: 1967-07-19
•
Granted: 1969-11-18
•
Expires: 1987-07-19
Abstract
No abstract record available.
Inventors
- 👤 John T Linker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:50
CPC Classifications
B; B41; B41J; B41J7/00; B41J7/02; B41J7/26; H; H01; H01H; H01H2215/00; H01H2215/004; H01H2215/006; H01H2215/012
Claims Analysis
Total Claims: 0
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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) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |