Patent US2549157A successfully refreshed from Google Patents.
US2549157A
Expired / Lapsed
US
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Audible signaling device
Assignee: AUTH ELECTRICAL SPECIALTY Co
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Filing: 1946-03-16
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Granted: 1951-04-17
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Expires: 1966-03-16
Abstract
No abstract record available.
Inventors
- 👤 Charles G Auth
- 👤 Alfred H Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:25
CPC Classifications
G; G10; G10K; G10K1/00; G10K1/06; G10K1/07; Y; Y10; Y10S; Y10S116/00; Y10S116/30
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) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |