Patent US2745021A successfully refreshed from Google Patents.
US2449304A
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Supervisory electrical alarm system
Assignee: Weston Electric Instrument Corp
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Filing: 1946-05-16
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Granted: 1948-09-14
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Expires: 1966-05-16
Abstract
No abstract record available.
Inventors
- 👤 Anthony H Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:12
CPC Classifications
G; G08; G08B; G08B26/00; F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1856
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |