US3458797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter circuit for supplying a sine wave substantially free of harmonics
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1967-08-15
•
Granted: 1969-07-29
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Expires: 1987-08-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur B Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:59
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/497; H01; H01F; H01F27/00; H01F27/34; H02M7/02; H02M7/04; H02M7/06; H02M7/068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2875351A
Cited
US3010062A
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US3031629A
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US3242415A
Cited
US3205424A
Cited
US3278827A
Cited
US3309600A
Cited
US3297936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |