US3532928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-failure warning system with oppositely wound transformer and scr logic circuit
Assignee: ROGER F WEST
•
Filing: 1967-05-10
•
Granted: 1970-10-06
•
Expires: 1987-05-10
Abstract
No abstract record available.
Inventors
- 👤 Roger F West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:01
CPC Classifications
B; B60; B60Q; B60Q11/00; B60Q11/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1805764A
Cited
US1997848A
Cited
US1972514A
Cited
US2719288A
Cited
US3143729A
Cited
US3253220A
Cited
US3311779A
Cited
US3250950A
Cited
US3405357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |