Patent US3709706A successfully refreshed from Google Patents.
US3709706A
Expired / Lapsed
US
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Refractory fibers and other articles of zirconia and silica mixtures
Assignee: 3M Co
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Filing: 1969-05-16
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Granted: 1973-01-09
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Expires: 1989-05-16
Abstract
Abstract REFRACTORY AGGREGATES AND SHAPED ASTICLES, SUCH AS FIBERS, FILMS FLAKES, AND MICROSPHERS, OF ZIRCONIA ND SILICA MIXTURES, ARE MADE BY SHAPING AND DEHYDRATIVELAND GEL ING FOR EXAMPLE BY EXTRUDING IN AIR AN AQUEOUS MIXTURE OF A ZICONIUM COMPOUND, SUCH AS ZIRCONIUM DIACETATE, AND COLLOIDAL SILICA, AND HEAING THE RESULTING GELLED BODY OR ARTICLE IN A CONTROLLED MANNER TO DECOMPOSE AND VOLATILIZE UNDESIRED CONSTITUENTS AND CONVERT THE BODY TO A REFRACTORY MATERIAL OR ARTICLE HAVING A DESIRED MICROSTRUCTURE AND USEFUL TO FORM REFRACTORY FABRICS, REINFORCED COMPOSITES, HEAT OR SOUND INSULATION FILTER OF ADSORPTION MEDIA, FILLERS, PIGMENTS, ETC.
Inventors
- 👤 H Sowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:13
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6225; C04B35/01; C04B35/48; C04B35/6224; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
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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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |