US3640884A
Expired / Lapsed
US
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Azeotropic cleaning solvents based on 1 1 2 2-tetrachloro-1 2-difluoroethane
Assignee: Union Carbide Corp
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Filing: 1968-10-28
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Granted: 1972-02-08
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Expires: 1988-10-28
Abstract
Abstract THE DISCLOSURE RELATED TO BINARY AND TERNARY AZEOTROPIC MIXTURES OF TETRACHLORODIFLUOROETHANE. THE BINARY AZEOTROPES CONTAIN TETRACHLORODIFLUOROETHANE AS ONE COMPONENT AND EITHER ACETIC ACID, PROPIONIC ACID, DIOXANE, MONOMETHYL ETHER OF ETHYLENE GLYCOL, ETHYL ACETATE, ISOPROPYL ACETATE OR N-PROPLY ACETATE AS THE SECOND COMPONENTS. THE TERNARY AZEOTROPES CONTAIN TETRACHLORODIFLUOROETHANE AS THE FIRST COMPONENT, 1,2-DICHLOROETHANE AS THE SECOND COMPONENT AND EITHER METHANOL, ETHANOL OR ISOPROPANOL AS THE THIRD COMPONENT. IT HAS BEEN DISCOVERED THAT THESE AZEOTROPES MAY BE USED IN SOLVENT VAPOR CLEANING AND DEGREASING APPLICATIONS.
Inventors
- 👤 John Allan Schofield
- 👤 Roger A Delano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:28
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02822; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C11D7/5086; C23G5/02806
Claims Analysis
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |