US3550111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security alarm system
Assignee: HAROLD D ERVIN
•
Filing: 1966-08-16
•
Granted: 1970-12-22
•
Expires: 1986-08-16
Abstract
No abstract record available.
Inventors
- 👤 Harold D Ervin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:24
CPC Classifications
G; G08; G08B; G08B19/00; G08B19/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2909767A
Cited
US3128456A
Cited
US2983912A
Cited
US3174143A
Cited
US3135951A
Cited
US3307176A
Cited
US3304547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |