Patent US3311481A successfully refreshed from Google Patents.
US3311481A
Expired / Lapsed
US
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Refractory fibers and methods of making them
Assignee: BP Chemicals Hitco Inc
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Filing: 1962-03-01
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Granted: 1967-03-28
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Expires: 1982-03-01
Abstract
No abstract record available.
Inventors
- 👤 Sterry John Patrick
- 👤 Baldo M Kristovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6225; C04B35/6224; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
THE PROCESS OF PREPARING CERAMIC FIBRES HAVING AT LEAST SUBSTANTIAL PROPORTIONS OF ZIRCON WHICH INCLUDES THE STEPS OF ADDING COLLOIDAL SILICA TO ZIRCONIUM DIACETATE IN A PROPORTION ESTABLISHING A 1:1 MOLAR RATIO BETWEEN THE ZIRCONIA AND SILICA CONSTITUENTS, ADDING ACETIC ACID TO MAINTAIN THE PH IN THE RANGE OF APPROXIMATELY 3.5 TO 4.0, EVAPORATING THE AMORPHOUS MASS THUS PROVIDED TO A VISCOSITY OF BETWEEN 15,000 AND 40,000 CENTIPOISE AT 70*F., FORMING AMORPHOUS FIBERS FROM THE MASS, AND FIRING THE FIBERS AT SUCCESSIVELY HIGHER TEMPERATURES TO ABOVE THE CRYSTAL-FORMING TEMPERATURE OF THE FIBERS BUT BELOW THE FUSION TEMPERATURE OF ZIRCONIA, SILICA AND ZIRCON TO DECOMPOSE AND ELIMINATE OTHER CONSTITUENTS AND TO FORM POLYCRYSTALLINE FIBERS.
Claim 2
Dependent Claim
113 words
THE PROCESS OF PREPARING CERAMIC FIBRES HAVING AT LEAST SUBSTANTIAL PROPORTIONS OF ZIRCON WHICH INCLUDES THE STEPS OF ADDING COLLOIDAL SILICA TO ZIRCONIUM DIACETATE IN A PROPORTION ESTABLISHING A 1:1 MOLAR RATIO BETWEEN THE ZIRCONIA AND SILICA CONSTITUENTS, ADDING ACETIC ACID TO MAINTAIN THE PH IN THE RANGE OF APPROXIMATELY 3.5 TO 4.0, EVAPORATING THE AMORPHOUS MASS THUS PROVIDED TO A VISCOSITY OF BETWEEN 15,000 AND 40,000 CENTIPOISE AT 70*F., FORMING AMORPHOUS FIBERS FROM THE MASS, AND FIRING THE FIBERS AT SUCCESSIVELY HIGHER TEMPERATURES TO ABOVE THE CRYSTAL-FORMING TEMPERATURE OF THE FIBERS BUT BELOW THE FUSION TEMPERATURE OF ZIRCONIA, SILICA AND ZIRCON TO DECOMPOSE AND ELIMINATE OTHER CONSTITUENTS AND TO FORM POLYCRYSTALLINE FIBERS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |