US3516529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard lock
Assignee: Singer Co
•
Filing: 1968-01-26
•
Granted: 1970-06-23
•
Expires: 1988-01-26
Abstract
No abstract record available.
Inventors
- 👤 Russell A Shurtliff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:07
CPC Classifications
G; G06; G06C; G06C7/00; G06C7/02; G06C7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB1052696A
Cited
US232692A
Cited
GB191415468A
Cited
US2060431A
Cited
US3107771A
Cited
US3032168A
Cited
US3366216A
Cited
US3369643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |