US3734817A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treated quartz vessels for use in producing and further processing iii-v semiconductor bodies low in silicon
Assignee: Siltronic AG
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Filing: 1970-11-23
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Granted: 1973-05-22
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Expires: 1990-11-23
Abstract
Abstract A VESSEL PARTICULARLY A PHIAL OR AN AMPOULE FOR USE IN PRODUCING, AND FURTHER PROCESSING, III-V SEMICONDUCTOR BODIES LOW IN SILICON, WHICH VESSEL IS COMPOSED OF QUARTZ HAVING ITS INSIDE WALL COATED WITH A SUBSTANCE WHICH IS INERT AT THE WORKING TEMPERATURE. SEMICONDUCTOR BODIES PRODUCED OR FURTHER PROCESSED IN SUCH A VESSEL CONTAIN MUCH LESS SILICON THAN SIMILAR BODIES PRODUCED OR PROCCESSED IN CONVENTIONAL QUARTZ VESSELS.
Inventors
- 👤 K Bienert
- 👤 W Lang
- 👤 E Nordt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:05
CPC Classifications
C; C30; C30B; C30B31/00; C30B31/06; C30B31/10; C30B35/00; C30B35/002; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S206/00; Y10S206/832; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |