Patent US2981645A successfully refreshed from Google Patents.
US2981645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device fabrication
Assignee: International Business Machines Corp
•
Filing: 1956-09-04
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Granted: 1961-04-25
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Expires: 1976-09-04
Abstract
No abstract record available.
Inventors
- 👤 Gardiner L Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:29
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/70; H10D; H10D99/00; H10P; H10P14/00; H10P14/40; H10P14/46; H10P14/47; H10P95/00; H10W72/00; H10W76/00; H10W76/10; H10W76/12; H10W76/161; H10W72/071; H10W72/075; H10W72/07551; H10W72/07552; H10W72/07554; H10W72/50; H10W72/521; H10W72/527; H10W72/531; H10W72/536; Y; Y10; Y10S; Y10S438/00; Y10S438/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
THE PROCESS OF PROVIDING A GRADED RESISTIVITY SEMICONDUCTOR BODY HAVING A KNOWN SUBSTANTIALLY CONSTANT RESISTIVITY TO A SPECIFIC DEPTH AT THE SURFACE THEREOF COMPRISING IN COMBINATION THE STEPS OF HEATING FOR A GIVEN TIME A SEMICONDUCTOR BODY PRESENCE OF A VAPOR CONTAINING A CONCENTRATION OF A SIGNIFICANT IMPURITY AND HEATING SAID BODY FOR A LESSER PERIOD OF TIME IN A VACUUM.
Claim 2
Dependent Claim
61 words
THE PROCESS OF PROVIDING A GRADED RESISTIVITY SEMICONDUCTOR BODY HAVING A KNOWN SUBSTANTIALLY CONSTANT RESISTIVITY TO A SPECIFIC DEPTH AT THE SURFACE THEREOF COMPRISING IN COMBINATION THE STEPS OF HEATING FOR A GIVEN TIME A SEMICONDUCTOR BODY PRESENCE OF A VAPOR CONTAINING A CONCENTRATION OF A SIGNIFICANT IMPURITY AND HEATING SAID BODY FOR A LESSER PERIOD OF TIME IN A VACUUM.
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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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |