US3108073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for doping semiconductive bodies
Assignee: WR Grace and Co
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Filing: 1961-10-26
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Granted: 1963-10-22
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Expires: 1981-10-26
Abstract
No abstract record available.
Inventors
- 👤 Milton C Vanik
- 👤 Moises G Sanchez
- 👤 George W Smouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:07
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/08; C30B13/10; C30B13/12; H; H10; H10P; H10P95/00; Y; Y10; Y10S; Y10S117/00; Y10S117/906; Y10S118/00; Y10S118/90; Y10S148/00; Y10S148/041; Y10S438/00; Y10S438/914; Y10S438/925
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
PROCESS WHICH COMPRISES ESTABLISHING A RESERVOIR OF AN INERT GAS CONTAINING A SMALL CONTROLLED AMOUNT OF A GASEOUS DOPING SUBSTANCE, ZONE REFINING A ROD OF SEMICONDUCTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON AND GERMANIUM WHILE FLOWING A MAIN STREAM OF INERT GAS THEREOVER, FORCEING DOPED INERT GAS FROM SAID RESERVOIR INTO SAID MAIN STREAM OF INERT GAS IN EXPONENTIALLY DECREASING AMOUNTS AS THE ZONE REFINING PROCEEDS, CEASING THE FLOW OF DOPED INERT GAS AT THE END OF THE ZONE REFINING PASS, AND COOLING SAID ROD OF SEMICONDUCTIVE MATERIAL TO AMBIENT TEMPERTURES WHILE MAINTAINING THE FLOW OF SAID MAIN STREAM OF INERT GAS.
References Cited (Backward Citations)
US2768914A
Cited
US2887453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |