US2921275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-terminal networks
Assignee: Pye Electronic Products Ltd
•
Filing: 1954-10-08
•
Granted: 1960-01-12
•
Expires: 1974-10-08
Abstract
No abstract record available.
Inventors
- 👤 O'donovan Harry Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:57
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2333148A
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US2356446A
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US2362549A
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US2669697A
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US2477475A
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US2740941A
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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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |