US2923882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signalling apparatus
Assignee: Individual
•
Filing: 1955-11-14
•
Granted: 1960-02-02
•
Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 Henry K Bradford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:51
CPC Classifications
H; H03; H03B; H03B19/00; H03H; H03H11/00; H03H11/02; H03H11/26; H03H11/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2394196A
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US2484618A
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US2474268A
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US2500431A
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US2565231A
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US2545871A
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US2447543A
Cited
US2650949A
Cited
US2607031A
Cited
US2666181A
Cited
US2650350A
Cited
US2765446A
Cited
US2811664A
Cited
US2835802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |