US3795524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum borate and aluminum borosilicate articles
Assignee: 3M Co
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Filing: 1971-03-01
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Granted: 1974-03-05
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Expires: 1991-03-01
Abstract
Abstract TRANSPARENT REFRACTORY AGGREGATES AND SHAPED ARTICLES, SUCH AS FIBERS, FILMS, FLAKES, AND MICROSPHERES, OF NOVEL ALUMINUM BORATE OR ALUMINUM BOROSILICATE COMPOSITIONS FREE OF CRYSTALLINE ALUMINA ARE MADE BY SHAPING AND DEHYDRATIVELY GELLING, FOR EXAMPLE BY EXTRUDING IN AIR, VISCOUS AQUEOUS BORIC ACID-STABILIZED ALUMINUM ACETATE, WITH OR WITHOUT COLLOIDAL SILICA DISPERSED THEREIN, AND HEATING THE RESULTING GELLED BODY OR ARTICLE IN A CONTROLLED MANNER TO DECOMPOSE THE VOLATILIZED UNDRSIRED CONTITUENTS AND CONVERT THE BODY TO SAID REFRACTORY MATERIAL OR ARTICLE, WHICH IS USEFUL TO FORM, FOR EXAMPLE, REFRACTORY FABRICS, OR AS REINFORCEMENT FOR COMPOSITES.
Inventors
- 👤 H Sowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:27
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/08; C01B35/10; C01B35/06; C01B35/12; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6224; C04B35/62245
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |