US3475702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical filters
Assignee: English Electric Co Ltd
•
Filing: 1966-02-01
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Granted: 1969-10-28
•
Expires: 1986-02-01
Abstract
No abstract record available.
Inventors
- 👤 John Desmond Ainsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:16
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/14; H02M1/146; H02M1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |