Patent US3795994A successfully refreshed from Google Patents.
Patent US3632709A successfully refreshed from Google Patents.
US3632709A
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US
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Making alumina fibers from a mixture of alumina sol and hexamethylenetetramine
Assignee: Universal Oil Products Co
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Filing: 1968-12-27
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Granted: 1972-01-04
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Expires: 1988-12-27
Abstract
Abstract A METHOD OF PREPARING FLEXIBLE, REFRACTORY INORGANIC FIBERS. A REFRACTORY INORGANIC OXIDE SOL, E.G., AN ALUMINA SOL, IS ADMIXED A SOLUBLE ORGANIC AMINE, SUITABLY HEXAMETHYLENETETRAMINE, AND DRAWN INTO FIBERS. THE FIBERS ARE THEREAFTER CALCINED AT 300-1000*C. TO PRODUCE POROUS FLEXIBLE FIBERS OF HIGH SURFACE AREA. THE HEXAMETHYLENETETRAMINE HAS THE EFFECT OF INHIBITING CRYSTALS GROWTH OF THE GAMMA-ALUMINA DURING THE FIBER CALCINING STEP.
Inventors
- 👤 John C Hayes
- 👤 Jay E Sobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/62236; B; B01; B01J; B01J35/00; B01J35/50; B01J35/58; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |