US3047810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarized phase discriminating circuit with limited direct current flow
Assignee: Shell USA Inc
•
Filing: 1958-04-21
•
Granted: 1962-07-31
•
Expires: 1978-04-21
Abstract
No abstract record available.
Inventors
- 👤 Thorwald J Tvedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2684465A
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US2577668A
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US2527096A
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US2644084A
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US2694143A
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US2794928A
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US2751555A
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US2890329A
Cited
US2833918A
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US2889473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |