Patent US2808315A successfully refreshed from Google Patents.
US2808315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of silicon
Assignee: AT&T Inc
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Filing: 1956-01-16
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Granted: 1957-10-01
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Expires: 1976-01-16
Abstract
No abstract record available.
Inventors
- 👤 Bemski George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:59
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; H; H10; H10P; H10P95/00; H10P95/90; C22; C22F; C22F3/00; H10P32/00; Y; Y10; Y10S; Y10S438/00; Y10S438/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
IN THE PROCESS OF MANUFACTURINGA SINGLE CRYSTAL SILICON BODY WHEREIN SAID BODY IS SUBJECTED TO AN ELEVATED TEMPERATURE IN EXCESS OF 400*C. THE METHOD OF LIMITING THE THERMAL DEGRADATION OF MINORITY CARRIER LIFETIME COMPRISING COOLING SAID BODY FROM SAID ELEVATED TEMPERATURE TO BELOW 400*C. AT A MAXIMUM RATE 20* C. PER MINUTE.
Claim 2
Dependent Claim
52 words
IN THE PROCESS OF MANUFACTURINGA SINGLE CRYSTAL SILICON BODY WHEREIN SAID BODY IS SUBJECTED TO AN ELEVATED TEMPERATURE IN EXCESS OF 400*C. THE METHOD OF LIMITING THE THERMAL DEGRADATION OF MINORITY CARRIER LIFETIME COMPRISING COOLING SAID BODY FROM SAID ELEVATED TEMPERATURE TO BELOW 400*C. AT A MAXIMUM RATE 20* C. PER MINUTE.
References Cited (Backward Citations)
US2743200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |