US3183129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a semiconductor
Assignee: Fairchild Semiconductor Corp
•
Filing: 1963-07-15
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Granted: 1965-05-11
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Expires: 1983-07-15
Abstract
No abstract record available.
Inventors
- 👤 Gareth A Tripp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:50
CPC Classifications
H; H10; H10P; H10P95/00; H10D; H10D84/00; H10D84/40; H10D84/401; H10D84/403; H10D99/00; H10W; H10W15/00; H10W15/01; Y; Y10; Y10S; Y10S148/00; Y10S148/062; Y10S148/151; Y10S438/00; Y10S438/914; Y10S438/919; Y10S438/923
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
AN IMPROVED METHOD OF FORMING A TRANSISTOR COMPRISING THE STEPS OF: (A) MASKING A PORTION OF ONE SURFACE OF AN N-TYPE SILICON WAFER WITH SILICONOXIDE TO DEFINE THE LATERAL EXTENT OF THE P-TYPE BASE REGION TO BE FORMED THEREUNDER AND TO LEAVE AN EXPOSED PORTION OF THE SURFACE FOR THE DIFFUSION OF A DONOR IMPURITY; (B) DIFFUSING A DONOR IMPURITY WHICH IS MASKED BY SILICON OXIDE INTO THE WAFER FROM SAID SURFACE TO ESTABLISH A RECIPROCAL REGION IN SAID WAFER OF A PREDETRERMINED DEPTH HAVING ADDITONAL DONOR IMPURITIES SURROUNDING THE MASKED PORTIONS OF SAID WAFER;
Claim 2
Dependent Claim
95 words
AN IMPROVED METHOD OF FORMING A TRANSISTOR COMPRISING THE STEPS OF: (A) MASKING A PORTION OF ONE SURFACE OF AN N-TYPE SILICON WAFER WITH SILICONOXIDE TO DEFINE THE LATERAL EXTENT OF THE P-TYPE BASE REGION TO BE FORMED THEREUNDER AND TO LEAVE AN EXPOSED PORTION OF THE SURFACE FOR THE DIFFUSION OF A DONOR IMPURITY; (B) DIFFUSING A DONOR IMPURITY WHICH IS MASKED BY SILICON OXIDE INTO THE WAFER FROM SAID SURFACE TO ESTABLISH A RECIPROCAL REGION IN SAID WAFER OF A PREDETRERMINED DEPTH HAVING ADDITONAL DONOR IMPURITIES SURROUNDING THE MASKED PORTIONS OF SAID WAFER;
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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) | 1968-05-10 | 1968-11-09 | 1969-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-10 | 1972-11-09 | 1973-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-10 | 1976-11-09 | 1977-05-11 | $7700.00 | Window Closed / Lapsed |