Patent US3437937A successfully refreshed from Google Patents.
US2887632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc oxide semiconductors and methods of manufacture
Assignee: Timefax Corp
•
Filing: 1952-04-16
•
Granted: 1959-05-19
•
Expires: 1972-04-16
Abstract
No abstract record available.
Inventors
- 👤 Harold R Dalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:44
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/02; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A TRANSISTOR COMPRISING A SEMICONDUCTOR CONSISTING ESSENTIALLY OF NORMALLY NON-CONDUCTIVE ZINC OXIDE AND AT LEAST ONE METAL HAVING A VALENCE OF NOT LESS THAN 2 NOR MORE THAN 3 WITH THE METAL COMPONENT CONSTITUTING FROM 0.2 PERCENT TO 20 PERCENT, THE ZINC OXIDE AND METAL HAVING BEEN HEATED TOGETHER INA REDUCING ATMOSPHERE NOT SUBSTANTIALLY HIGHER THAN 900 DEGREES C. TO INDUCE SUBSTANTIAL ELECTRIC CONDUCTIVITY INTO THE ZINC OXIDE, AN EMITTER ELECTRODE, AND A COLLECTOR ELECTRODE, BOTH OF SAID ELECTRODE BEING SUPPORTED WITH THEIR TIPS IN CLOSELY SPACED RELATION AND IN CONTACT WITH THE SURFACE OF SAID SEMICONDUCTOR.
Claim 2
Dependent Claim
97 words
A TRANSISTOR COMPRISING A SEMICONDUCTOR CONSISTING ESSENTIALLY OF NORMALLY NON-CONDUCTIVE ZINC OXIDE AND AT LEAST ONE METAL HAVING A VALENCE OF NOT LESS THAN 2 NOR MORE THAN 3 WITH THE METAL COMPONENT CONSTITUTING FROM 0.2 PERCENT TO 20 PERCENT, THE ZINC OXIDE AND METAL HAVING BEEN HEATED TOGETHER INA REDUCING ATMOSPHERE NOT SUBSTANTIALLY HIGHER THAN 900 DEGREES C. TO INDUCE SUBSTANTIAL ELECTRIC CONDUCTIVITY INTO THE ZINC OXIDE, AN EMITTER ELECTRODE, AND A COLLECTOR ELECTRODE, BOTH OF SAID ELECTRODE BEING SUPPORTED WITH THEIR TIPS IN CLOSELY SPACED RELATION AND IN CONTACT WITH THE SURFACE OF SAID SEMICONDUCTOR.
References Cited (Backward Citations)
US1640335A
Cited
US1784435A
Cited
US1994632A
Cited
US2182377A
Cited
US2408475A
Cited
US2544236A
Cited
US2529711A
Cited
US2699522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |