Patent US3543012A successfully refreshed from Google Patents.
US3543012A
Expired / Lapsed
US
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Universal digital filter and function generator
Assignee: United States Department of the Navy
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Filing: 1968-07-10
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Granted: 1970-11-24
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Expires: 1988-07-10
Abstract
No abstract record available.
Inventors
- 👤 John E Courtney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:30
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/0294; G; G06; G06G; G06G7/00; G06G7/48; G06G7/62; G06G7/623; H03H17/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2567532A
Cited
US3167649A
Cited
US3250898A
Cited
US3305676A
Cited
US3351749A
Cited
US3445643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |