US2636121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatically operated signaling apparatus
Assignee: Individual
•
Filing: 1949-02-14
•
Granted: 1953-04-21
•
Expires: 1969-02-14
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Freas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:23
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/03; H04B1/034; H01; H01Q; H01Q1/00; H01Q1/08; H01Q1/10; H01Q1/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1672596A
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US1933694A
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US1985184A
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US2198697A
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US2232693A
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US2172117A
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US2179415A
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US2239614A
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US2286764A
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US2327163A
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US2350866A
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US2344425A
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US2402143A
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US2555867A
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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) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |