Patent US3738805A successfully refreshed from Google Patents.
US3738805A
Expired / Lapsed
US
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Method of producing purified asbestos structures
Assignee: REX ASBESTWERKE
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Filing: 1971-06-08
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Granted: 1973-06-12
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Expires: 1991-06-08
Abstract
Abstract METHOD OF PRODUCING PURIFIED, SHAPED ASBESTOS STRUCTURES WHICH ARE OBTAINED BY PROCESSNG AND COAGULATING DISPERSIONS OF ASBESTOS FIBERS CONTAINING ORGANIC ADDITIVES. THE STRUCTURES ARE PURIFIED TO REMOVED RESISDUES OF THE ORGANIC ADDITIVES. THE PURIFICATION IS EFFECTED BY SUBJECTING THE STRUCTURES TO A SOLVENT TREATMENT WITH A LOWER ALIPHATIC ALCOHOL AND/OR AN AQUEOUS SOLUTION OF AN ORGANIC BASE. THE LOWER ALIPHATIC ALCOHOL MAY BE USED IN MIXTURE WITH AQUEOUS INORGANIC BASES.
Inventors
- 👤 H Fetzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:02
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/53; C04B41/5315; D; D02; D02G; D02G3/00; D02G3/02; D02G3/16; D02G3/20
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |