US3316131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a field-effect transistor
Assignee: Texas Instruments Inc
•
Filing: 1963-08-15
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Granted: 1967-04-25
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Expires: 1983-08-15
Abstract
No abstract record available.
Inventors
- 👤 Wisman Emery Clarance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:41
CPC Classifications
H; H10; H10D; H10D99/00; H10D30/00; H10D30/80; H10P; H10P32/00; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF MAKING A SEMICONDUCTOR DEVICE OF THE FIELD-EFFECT TYPE COMPRISING THE STEPS OF: EPITAXIALLY GROWING A LAYER OF P-TYPE SEMICONDUCTOR MATERIAL ON A MAJOR FACE OF A HIGH RESISTIVITY SEMICONDUCTOR SUBSTRATE, LAPPING THE OTHER MAJOR FACE OF SID SUBSTRATE TO REDUCE THE SUBSTRATE THICKNESS TO BETWEEN 0.2 TO 0.6 MIL, EPITAXIALLY GROWING A SECOND LAYER OF N-DOPED SEMICONDUCTOR MATERIAL ON SAID LAPPED MAJOR FACE OF SAID SUBSTRATE, DIFFUSING TWO N+ REGIONS INTO SID N-DOPED LAYER, AND DIFFUSING A P+ REGION INTO SAID N-DOPED LAYER INTRMEDIATE SAID TWO N+ REGIONS.
Claim 2
Independent Claim
91 words
THE METHOD OF MAKING A SEMICONDUCTOR DEVICE OF THE FIELD-EFFECT TYPE COMPRISING THE STEPS OF: EPITAXIALLY GROWING A LAYER OF P-TYPE SEMICONDUCTOR MATERIAL ON A MAJOR FACE OF A HIGH RESISTIVITY SEMICONDUCTOR SUBSTRATE, LAPPING THE OTHER MAJOR FACE OF SID SUBSTRATE TO REDUCE THE SUBSTRATE THICKNESS TO BETWEEN 0.2 TO 0.6 MIL, EPITAXIALLY GROWING A SECOND LAYER OF N-DOPED SEMICONDUCTOR MATERIAL ON SAID LAPPED MAJOR FACE OF SAID SUBSTRATE, DIFFUSING TWO N+ REGIONS INTO SID N-DOPED LAYER, AND DIFFUSING A P+ REGION INTO SAID N-DOPED LAYER INTRMEDIATE SAID TWO N+ REGIONS.
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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) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |