US2948642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of silicon devices
Assignee: AT&T Inc
•
Filing: 1959-05-08
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Granted: 1960-08-09
•
Expires: 1979-05-08
Abstract
No abstract record available.
Inventors
- 👤 Robert W Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:58
CPC Classifications
H; H10; H10P; H10P50/00; C; C30; C30B; C30B31/00; C30B31/06; H10P14/00; H10P14/60; H10P14/61; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/017; Y10S148/043; Y10S148/063; Y10S438/00; Y10S438/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
THE METHOD OF TREATING SURFACES OF SILICON SEMICONDUCTOR DEVICES TO PROVIDE A SURFACE LAYER OF A SPECIFIC CONDUCTIVELY TYPE COMPRISING THERMALLY OXIDIZING THE SURFACE OF A SEMICONDUCTIVE BODY, REMOVING THE RESULTANT OXIDE LAYER, ETCHING THE EXPOSED SEMICONDUCTOR BODY
Claim 2
Independent Claim
38 words
THE METHOD OF TREATING SURFACES OF SILICON SEMICONDUCTOR DEVICES TO PROVIDE A SURFACE LAYER OF A SPECIFIC CONDUCTIVELY TYPE COMPRISING THERMALLY OXIDIZING THE SURFACE OF A SEMICONDUCTIVE BODY, REMOVING THE RESULTANT OXIDE LAYER, ETCHING THE EXPOSED SEMICONDUCTOR BODY
References Cited (Backward Citations)
US2879190A
Cited
US2899344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |