US2913357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor and method of making a transistor
Assignee: Union Carbide Corp
•
Filing: 1956-09-20
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Granted: 1959-11-17
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Expires: 1976-09-20
Abstract
No abstract record available.
Inventors
- 👤 Ostrofsky Bernard
- 👤 James W Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:14
CPC Classifications
H; H10; H10P; H10P95/00; H10P14/00; H10P14/20; H10P14/24; H10P14/29; H10P14/2901; H10P14/2902; H10P14/2905; H10P14/34; H10P14/3402; H10P14/3404; H10P14/3411; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/12674; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN THE METHOD OF MAKING AN ELECTRICAL TRANSISTOR COMPRISING A SEMI-CONDUCTOR OF THE N-TYPE SILICON BODY, THE IMPROVEMENT WHICH CONSISTS IN HEATING SAID SILICON BODY AND WHILE THUS HEATED CONTACTING THE SAME WITH CHROMIUM CARBONYL, THE TEMPERATURE OF SAID SILICON BODY BEING MAINTAINED SUFFICIENTLY HIGH TO CAUSE SAID CHROMIUM CARBONYL TO DECOMPOSE AND SUBSTANTIALLY PURE CHROMIUM METAL DEPOSITED AS A CONTINUOUS AND UNIFORM FILM OF METAL ON THE SURFACE OF SAID SILICON BODY TO PROVIDE A COMPOSITE SILICON-CHROMIUM METAL BODY.
Claim 2
Dependent Claim
80 words
IN THE METHOD OF MAKING AN ELECTRICAL TRANSISTOR COMPRISING A SEMI-CONDUCTOR OF THE N-TYPE SILICON BODY, THE IMPROVEMENT WHICH CONSISTS IN HEATING SAID SILICON BODY AND WHILE THUS HEATED CONTACTING THE SAME WITH CHROMIUM CARBONYL, THE TEMPERATURE OF SAID SILICON BODY BEING MAINTAINED SUFFICIENTLY HIGH TO CAUSE SAID CHROMIUM CARBONYL TO DECOMPOSE AND SUBSTANTIALLY PURE CHROMIUM METAL DEPOSITED AS A CONTINUOUS AND UNIFORM FILM OF METAL ON THE SURFACE OF SAID SILICON BODY TO PROVIDE A COMPOSITE SILICON-CHROMIUM METAL BODY.
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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) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |