US3736158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Czochralski-grown spinel for use as epitaxial silicon substrate
Assignee: Individual
•
Filing: 1971-03-19
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Granted: 1973-05-29
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Expires: 1991-03-19
Abstract
Abstract AN IMPROVED SINGLE-CRYSTAL MAGNESIUM ALUMINATE SPINEL IS GROWN FROM ALUMINA-RICH MELTS SO THAT THE RESULTING SPINEL CRYSTAL DISPLAYS A SINGLE LATTICE CONSTANT. THIS MATERIAL EXHIBITS SUPERIOR QUALITIES FOR USE AS AN EPITAXIAL SILICON SUBSTRATE, ESPECIALLY IN A VIEW OF ITS CHEMICAL STABILITY. A METHOD IS GIVEN FOR PRODUCING THESE IMPROVED SPINEL CRYSTALS BY AN ADAPTATION OF THE CZOCHRALSKI METHOD SUCH THAT CRYSTALS CAN BE PREPARED FROM NONSTOICHIOMETRIC MELTS.
Inventors
- 👤 G Cullen
- 👤 S Bolin
- 👤 A Morrison
- 👤 Chun Wang Chih
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:04
CPC Classifications
C; C30; C30B; C30B15/00; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/26; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902; Y10S148/00; Y10S148/129; Y10S148/15
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |