US3474346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic ripple filter and amplifier used therein
Assignee: Technipower Inc
•
Filing: 1966-09-15
•
Granted: 1969-10-21
•
Expires: 1986-09-15
Abstract
No abstract record available.
Inventors
- 👤 Johannes M Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:09
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/14; H02M1/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2106793A
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US2630557A
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US2889519A
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US3192483A
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US3092729A
Cited
US3209164A
Cited
US3286189A
Cited
US3392341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |