US3210225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making transistor
Assignee: Texas Instruments Inc
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Filing: 1961-08-18
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Granted: 1965-10-05
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Expires: 1981-08-18
Abstract
No abstract record available.
Inventors
- 👤 Jr John C Brixey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
H; H10; H10P; H10P32/00; H10D; H10D99/00; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/031; Y10S148/151
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD OF MAKING A PNP GERMANIUM TRANSITOR COMPRISING THE STEPS OF: (A) FORMING A LAYER OF SILICON DIOXIDE OVER A SURFACE OF A P-TYPE GERMANIUM BODY; (B) DIFFUSING A P-TYPE IMPURITY HAVING HIGH SOLUBILITY AND SLOW DIFFUSION RATE INTO SAID SURFACE OF THE BODY THROUGH SAID LAYER TO FORM A FIRST REGION OF INCREASED CONDUCTIVITY; (C) REDUCING THE AREA OF THE JUNCTION BETWEEN SAID FIRST REGION AND THE UNDIFFUSED PORTION OF SAID BODY BY ETCHING AWAY A PORTION OF SAID FIRST REGION TO FORM A MESA; (D) FORMING A SECOND REGION BY DIFFUSING AN N-TYPE IM-
Claim 2
Independent Claim
97 words
A METHOD OF MAKING A PNP GERMANIUM TRANSITOR COMPRISING THE STEPS OF: (A) FORMING A LAYER OF SILICON DIOXIDE OVER A SURFACE OF A P-TYPE GERMANIUM BODY; (B) DIFFUSING A P-TYPE IMPURITY HAVING HIGH SOLUBILITY AND SLOW DIFFUSION RATE INTO SAID SURFACE OF THE BODY THROUGH SAID LAYER TO FORM A FIRST REGION OF INCREASED CONDUCTIVITY; (C) REDUCING THE AREA OF THE JUNCTION BETWEEN SAID FIRST REGION AND THE UNDIFFUSED PORTION OF SAID BODY BY ETCHING AWAY A PORTION OF SAID FIRST REGION TO FORM A MESA; (D) FORMING A SECOND REGION BY DIFFUSING AN N-TYPE IM-
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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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |