US3832146A
Expired / Lapsed
US
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High pressure hydrothermal growth of quartz with high "q" values
Assignee: AT&T Inc
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Filing: 1972-06-16
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Granted: 1974-08-27
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Expires: 1992-06-16
Abstract
Abstract HYDROTHERMAL GROWTH OF HIGH ACOUSTIC QUARTZ (Q GREATER THAN 10**6) AT FAST RATES OF ABOUT 100 MILS PER DAY (2.5 MM./DA.) IS MADE POSSIBLE BY THE UTILIZATION OF PRESSURES EXCEEDING 30,000 P.S.I. (2,069 BARS) AND A GROWTH TEMPERATURE EXCEEDING 350*C.
Inventors
- 👤 E Bresnahan
- 👤 R Laudise
- 👤 N Lias
- 👤 E Kolb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:36
CPC Classifications
C; C30; C30B; C30B7/00; C30B29/00; C30B29/10; C30B29/16; C30B29/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |