Patent US3686131A successfully refreshed from Google Patents.
US3686131A
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US
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Azeotropic composition of tetrachlorodifluoroethane isopropanol and water
Assignee: Individual
•
Filing: 1970-09-21
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Granted: 1972-08-22
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Expires: 1990-09-21
Abstract
Abstract THE DISCLOSURE RELATES TO AZEOTROPIC MIXTURES OF TETRACHLORODIFLUOROETHANE, ISOPROPANOL AND WATER.
Inventors
- 👤 John Allan Schofield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:54
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5086; C11D17/00; C11D17/0008; C11D17/0017; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02822
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |