Patent US1999219A successfully refreshed from Google Patents.
Patent US3682594A successfully refreshed from Google Patents.
US3682594A
Expired / Lapsed
US
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Purification of silicon halides
Assignee: Texas Instruments Inc
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Filing: 1969-11-19
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Granted: 1972-08-08
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Expires: 1989-11-19
Abstract
Abstract IMPURITIES SUCH AS BORON AND ALUMINUM ARE REMOVED FROM SILICON HALIDE BY PASSING THE SILICON HALIDE THROUGH AN ADSORBENT MATERIAL FORMED BY THE PARTIAL PYROLYSIS OF POLYACRYLONITRILE OR POLYMETHACRYLONITRILE. THE ADSORBENT CAN BE EITHER IN A PARTICULATE FORM OR AS FIBERS IN A PRESSED OR WOVEN MAT, FOR EXAMPLE.
Inventors
- 👤 John G Fish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:33
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; C; C01; C01B; C01B33/00; C01B33/08
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |