US2740955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic annunciator
Assignee: CHARLES S VRTIS
•
Filing: 1951-06-07
•
Granted: 1956-04-03
•
Expires: 1971-06-07
Abstract
No abstract record available.
Inventors
- 👤 Edward L Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:19
CPC Classifications
G; G08; G08B; G08B5/00; G08B5/22; G08B5/24; G08B5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2159820A
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US2555791A
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US2632888A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |