Patent US3586639A successfully refreshed from Google Patents.
US3586639A
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US
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Dispersion of asbestos
Assignee: NL Industries Inc
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Filing: 1967-03-08
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Granted: 1971-06-22
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Expires: 1987-03-08
Abstract
Abstract A PROCESS IS DISCLOSED WHEREBY CHRYSOTILE AND TREMOLITE CAN BE DISPERSED, IN AQUEOUS SUSPENSION, INTO THE INDIVIDUAL SUB-MICROSCOPIC FIBRILS COMPRISING THE AGGREGATES OF THE RAW MATERIAL. DISPERSION IS EFFECTED BY SHEARING THE STARTING MATERIAL IN A SOLUTION OF AN ORGANIC ACID HAVING NOT MORE THAN SIX CARBON ATOMS TOGETHER WITH A LONGCHAIN CATIONIC REAGENT, BOTH IN MINOR PROPORTION BY WEIGHT TO THE ASBESTOS. DISPERSION IS RAPID, VISCOSITIES AND GEL STRENGTHS OF THE DISPERSION ARE RELATIVELY LOW, AND THE DISPERSIONS ARE STABLE UPON STANDING. THE SEPARATED FIBRILS MAY BE RECOVERED FOR VARIOUS USES.
Inventors
- 👤 Roy F House
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:24
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C04; C04B; C04B20/00; C04B20/02; C04B20/08; C01; C01P; C01P2004/00; C01P2004/20; C01P2006/00; C01P2006/22; C09K; C09K23/00; C09K23/22; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |