US2390221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system
Assignee: American District Telegraph Co
•
Filing: 1943-07-03
•
Granted: 1945-12-04
•
Expires: 1963-07-03
Abstract
No abstract record available.
Inventors
- 👤 Maxwell H A Lindsay
- 👤 Woloschak Konstantin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:15
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/26; G08B23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-12-03 | 1949-06-04 | 1949-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-03 | 1953-06-04 | 1953-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-03 | 1957-06-04 | 1957-12-04 | $7700.00 | Window Closed / Lapsed |