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US3435320A
Expired / Lapsed
US
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Dc to dc converter
Assignee: DICK E STEARNS
•
Filing: 1967-02-10
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Granted: 1969-03-25
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Expires: 1987-02-10
Abstract
No abstract record available.
Inventors
- 👤 Robert H Lee
- 👤 Dick E Stearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:26
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3381
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2791739A
Cited
US2846580A
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US2967991A
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US2957145A
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US3158751A
Cited
US3316445A
Cited
US3331033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |