US3591337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing silicon nitride
Assignee: ZF International UK Ltd
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Filing: 1968-03-13
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Granted: 1971-07-06
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Expires: 1988-03-13
Abstract
Abstract SILICON NITRIDE IS MANUFACTURED BY MIXING FINELY DIVIDED SILICON WITH FINELY DIVIDED SILICON NITRIDE AND THEN HEATING THE RESULTANT MIXTURE IN A NON-OXIDISING ATMOSPHERE CONTAINING NITROGEN. THE NORMAL WAY OF MAKING SILICON NITRILE IS TO USE FINELY DIVIDED SILICON ALONE, BUT IT IS FOUND THAT THE ADDITION OF SOME SILICON NITRIDE LEADS TO A REDUCTION IN OPERATING TIME WHICH IS CONSIDERABLY GREATER THAN THE REDUCTION WHICH WOULD BE EXPECTED BECAUSE SOME OF THE MIXTURE IS ALREADY CONSITUTED BY SILICON NITRIDE.
Inventors
- 👤 Roland John Lumbey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/591; C01; C01B; C01B21/00; C01B21/06; C01B21/068; C01B21/0682
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |