Patent US1780669A successfully refreshed from Google Patents.
US1780669A
Expired / Lapsed
US
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Frequency-responsive signal-receiving apparatus
Assignee: General Electric Co
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Filing: 1925-04-23
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Granted: 1930-11-04
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Expires: 1945-04-23
Abstract
No abstract record available.
Inventors
- 👤 Bruckel Waldemar
- 👤 Schimpf Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:27
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/16; H; H03; H03J; H03J3/00; H03J3/02; H03J3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1933-11-03 | 1934-05-05 | 1934-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-11-03 | 1938-05-05 | 1938-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-11-03 | 1942-05-05 | 1942-11-04 | $7700.00 | Window Closed / Lapsed |