Patent US3052840A successfully refreshed from Google Patents.
US3052840A
Expired / Lapsed
US
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Method of testing semiconducting rectifiers
Assignee: PPG Industries Inc
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Filing: 1957-08-22
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Granted: 1962-09-04
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Expires: 1977-08-22
Abstract
No abstract record available.
Inventors
- 👤 John L Michaelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:45
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/26; G01R31/2607; G01R31/2632
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1696025A
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US1723861A
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US1752991A
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US2123859A
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US2158934A
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US2444458A
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US2547011A
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US2447658A
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US2760142A
Cited
US2820189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |