Patent US3215494A successfully refreshed from Google Patents.
US3215494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating chrysotile and product produced thereby
Assignee: Minerals and Chemicals Philipp Corp
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Filing: 1962-01-10
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Granted: 1965-11-02
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Expires: 1982-01-10
Abstract
No abstract record available.
Inventors
- 👤 Glen A Hemstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:02
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF TREATING CHRYSOTILE WITH COMPRISES CALCINING CHRYSOTILE AT A TEMPERATURE WITHIN THE RANGE OF 650*C. TO 1100*C. AND FOR A TIME SUFFICIENT TO DESTROY THE CHRYSOTILE CRYSTAL STRUCTURE AND SUBJECTING THE CALCINED CHRYSOTILE TO HYDROTHERMAL TREATMENT UNDER SUPERATMOSPHERIC PRESSURE UNTIL THE WATER OF CRYSTALLIZATION OF SAID CALCINED CHRYSOTILE IS WITHIN THE RANGE OF FROM AB OUT 5.3% TO AB OUT 5.9%.
Claim 2
Independent Claim
63 words
A METHOD OF TREATING CHRYSOTILE WITH COMPRISES CALCINING CHRYSOTILE AT A TEMPERATURE WITHIN THE RANGE OF 650*C. TO 1100*C. AND FOR A TIME SUFFICIENT TO DESTROY THE CHRYSOTILE CRYSTAL STRUCTURE AND SUBJECTING THE CALCINED CHRYSOTILE TO HYDROTHERMAL TREATMENT UNDER SUPERATMOSPHERIC PRESSURE UNTIL THE WATER OF CRYSTALLIZATION OF SAID CALCINED CHRYSOTILE IS WITHIN THE RANGE OF FROM AB OUT 5.3% TO AB OUT 5.9%.
References Cited (Backward Citations)
US2616801A
Cited
US2926997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |