US2554979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Element of asymmetric conductivity of selenium
Assignee: Compagnie des Freins et Signaux Westinghouse SA
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Filing: 1948-02-11
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Granted: 1951-05-29
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Expires: 1968-02-11
Abstract
No abstract record available.
Inventors
- 👤 Doucot Roger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:27
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A CONTACT MEMBER FOR MAKING CONTACT UNDER PRESSURE WITH THE COUNTERELECTRODE LAYER OF A SELENIUM RECTIFIER ELEMENT COMPRISING A SHEET OF SOFT METAL COATED WITH A LAYER OF MATERIAL HAVING
Claim 2
Dependent Claim
30 words
A CONTACT MEMBER FOR MAKING CONTACT UNDER PRESSURE WITH THE COUNTERELECTRODE LAYER OF A SELENIUM RECTIFIER ELEMENT COMPRISING A SHEET OF SOFT METAL COATED WITH A LAYER OF MATERIAL HAVING
References Cited (Backward Citations)
US2046686A
Cited
US2437336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |