US3507973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Touch sensitive capacitor timing percussion keying circuit
Assignee: Individual
•
Filing: 1968-05-01
•
Granted: 1970-04-21
•
Expires: 1988-05-01
Abstract
No abstract record available.
Inventors
- 👤 Lee De Pree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:55
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/057
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2482548A
Cited
US3018353A
Cited
US3197709A
Cited
US3259728A
Cited
US3306969A
Cited
US3333043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |