Patent US2366501A successfully refreshed from Google Patents.
US1238869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve-receiver for wireless signals.
Assignee: Marconi Wireless Telegraph Co America
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Filing: 1917-03-13
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Granted: 1917-09-04
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Expires: 1937-03-13
Abstract
No abstract record available.
Inventors
- 👤 George Maurice Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:33
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/14; H03D1/16
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) | 1920-09-03 | 1921-03-05 | 1921-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-09-03 | 1925-03-05 | 1925-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-09-03 | 1929-03-05 | 1929-09-04 | $7700.00 | Window Closed / Lapsed |