US1985118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry rectifier
Assignee: Koninklijke Philips NV
•
Filing: 1931-01-22
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Granted: 1934-12-18
•
Expires: 1951-01-22
Abstract
No abstract record available.
Inventors
- 👤 Willem Christiaan Van Geel
- 👤 Jan Hendrik De Boer
- 👤 Emmens Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:20
CPC Classifications
G; G03; G03B; G03B42/00; G03B42/02; G03B42/025; H; H10; H10D; H10D48/00; H10D48/01; H10D48/07; H10D62/00; H10D62/80; H10P; H10P10/00; H10P95/00; H10P95/80
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) | 1937-12-17 | 1938-06-18 | 1938-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-12-17 | 1942-06-18 | 1942-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-12-17 | 1946-06-18 | 1946-12-18 | $7700.00 | Window Closed / Lapsed |