Patent US3819786A successfully refreshed from Google Patents.
US3819786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of silicon nitride material components
Assignee: National Research Development Corp UK
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Filing: 1972-03-06
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Granted: 1974-06-25
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Expires: 1992-03-06
Abstract
Abstract SILICON NITRIDE COMPONENTS ARE FORMED BY HOT MILLING AND THEN SHAPING A DOUGH-LIKE MATERIAL COMPRISING SILICON POWDER AND A SUITABLE ORGANIC CHEMICAL BINDER CONSISTING OF FROM 35 TO 40% BUTYL METHACRYLATE AND 60-65% TRICHLOROETHYLENE AND SUBSEQUENTLY SUBJECTING THE FORM TO A NITRIDING TREATMENT.
Inventors
- 👤 E May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:42
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/591
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |