Patent US2514879A successfully refreshed from Google Patents.
US2514879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloys and rectifiers made thereof
Assignee: Purdue Research Foundation
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Filing: 1945-07-13
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Granted: 1950-07-11
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Expires: 1965-07-13
Abstract
No abstract record available.
Inventors
- 👤 Lark-Horovitz Karl
- 👤 Randall M Whaley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:06
CPC Classifications
C; C22; C22B; C22B41/00; C22B11/00; C22B11/10; H; H10; H10P; H10P95/00; Y; Y10; Y10S; Y10S420/00; Y10S420/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
AN ELECTRICAL DEVICE COMPRISING A SEMI-CONDUCTOR, A COUNTER ELECTRODE HAVING SUBSTANTIALLY POINT CONTACT WITH SAID SEMI-CONDUCTOR AND A SECOND ELECTRODE HAVING AN AREA OF CONTACT WITH SAID SEMI-CONDUCTOR WHICH IS LARGE COMPARED TO THAT OF THE COUNTER ELECTRODE, SAID SEMI-CONDUCTOR CONSISTING OF GERMANIUM OF THE ORDER OF 99% PURITY IN COMBINATION WITH AT LEAST ONE OF THE ELEMENTS FROM THE CLASS CONSISTING OF LEAD, TIN, AND TITANIUM, AND SAID DEVICE HAVING A PEAK BACK VOLTAGE IN THE RANGE IN EXCESS OF 10 VOLTS AND APPROACHING THE ORDER OF 200 VOLTS.
Claim 2
Dependent Claim
90 words
AN ELECTRICAL DEVICE COMPRISING A SEMI-CONDUCTOR, A COUNTER ELECTRODE HAVING SUBSTANTIALLY POINT CONTACT WITH SAID SEMI-CONDUCTOR AND A SECOND ELECTRODE HAVING AN AREA OF CONTACT WITH SAID SEMI-CONDUCTOR WHICH IS LARGE COMPARED TO THAT OF THE COUNTER ELECTRODE, SAID SEMI-CONDUCTOR CONSISTING OF GERMANIUM OF THE ORDER OF 99% PURITY IN COMBINATION WITH AT LEAST ONE OF THE ELEMENTS FROM THE CLASS CONSISTING OF LEAD, TIN, AND TITANIUM, AND SAID DEVICE HAVING A PEAK BACK VOLTAGE IN THE RANGE IN EXCESS OF 10 VOLTS AND APPROACHING THE ORDER OF 200 VOLTS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-10 | 1954-01-09 | 1954-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-10 | 1958-01-09 | 1958-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-10 | 1962-01-09 | 1962-07-11 | $7700.00 | Window Closed / Lapsed |