US3394026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of glazing silicon nitride shaped body and article
Assignee: National Research Development Corp UK
•
Filing: 1963-09-03
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Granted: 1968-07-23
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Expires: 1983-09-03
Abstract
No abstract record available.
Inventors
- 👤 Norman Lawrence Parr
- 👤 George Frank Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/591; C03; C03C; C03C8/00; C03C8/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF GLAZING A SHAPED BODY OF SELF-BONDED SILICON NITRIDE WHICH COMPRISES APPLYING A GLAZE COATING CONSISTING ESSENTIALLY OF A MIXTURE OF 5% BY WEIGHT FINE ALUMINA, 93% BY WEIGHT SILICA POWDER AND 2% BY WEIGHT FERRIC OXIDE SUSPENDED IN CETYL ALCOHOL AS A THIN COATING TO THE CLEANED SURFACE OF SAID SHAPED BODY OF SILICON NITRIDE, HEATING THE BODY TO RAISE THE TEMPERATURE THEREOF TO FROM 1300*C. TO 1500*C. IN AN OXYGEN ATMOSPHERE AND THEN ALLOWING THE BODY TO COOL.
Claim 2
Independent Claim
82 words
A METHOD OF GLAZING A SHAPED BODY OF SELF-BONDED SILICON NITRIDE WHICH COMPRISES APPLYING A GLAZE COATING CONSISTING ESSENTIALLY OF A MIXTURE OF 5% BY WEIGHT FINE ALUMINA, 93% BY WEIGHT SILICA POWDER AND 2% BY WEIGHT FERRIC OXIDE SUSPENDED IN CETYL ALCOHOL AS A THIN COATING TO THE CLEANED SURFACE OF SAID SHAPED BODY OF SILICON NITRIDE, HEATING THE BODY TO RAISE THE TEMPERATURE THEREOF TO FROM 1300*C. TO 1500*C. IN AN OXYGEN ATMOSPHERE AND THEN ALLOWING THE BODY TO COOL.
References Cited (Backward Citations)
US2934667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |