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US2002221A
Expired / Lapsed
US
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Dry rectifier
Assignee: Koninklijke Philips NV
•
Filing: 1931-05-01
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Granted: 1935-05-21
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Expires: 1951-05-01
Abstract
No abstract record available.
Inventors
- 👤 William Christiaan Van Geel
- 👤 Emmens Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:09
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/07; H10D48/04; H10D48/043; H10D48/046; H10D48/047; H10P; H10P95/00; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-05-20 | 1938-11-19 | 1939-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-05-20 | 1942-11-19 | 1943-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-05-20 | 1946-11-19 | 1947-05-21 | $7700.00 | Window Closed / Lapsed |