US2644915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selenium rectifier and method of its production
Assignee: AT&T Inc
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Filing: 1950-07-24
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Granted: 1953-07-07
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Expires: 1970-07-24
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Thurber
- 👤 Leland A Wooten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:51
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D48/042; H10P; H10P14/00; H10P14/20; H10P14/22; H10P14/29; H10P14/2901; H10P14/2923; H10P14/32; H10P14/3202; H10P14/3241; H10P14/34; H10P14/3402
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
A DRY RECTIFIER COMPRISING AN IRON BASE PLATE ELECTRODE, A UNIFORMLY THIN MATRIX COATING OF FINELY DIVIDED NICKEL PARTICLES SINTERED TO SAID BASE PLATE, SAID NICKEL COATING CONSISTING OF FROM 3 TO 6
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |