Patent US3925010A successfully refreshed from Google Patents.
US3925010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry cleaning process utilizing azeatropic nonflammable vapors
Assignee: Honeywell International Inc
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Filing: 1973-12-03
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Granted: 1975-12-09
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Expires: 1993-12-03
Abstract
Abstract Mixtures comprising water, tertiary amyl alcohol and tetrachlorodifluoroethane which, over substantially the entire course of their evaporation or distillation, form azeotropic nonflammable vapors containing tertiary amyl alcohol and tetrachlorodifluoroethane. These mixtures are useful in dry cleaning textile fabrics and fibers with reduced hazard of fire.
Inventors
- 👤 Oliver A Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:47
CPC Classifications
D; D06; D06L; D06L1/00; D06L1/02; C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C11D7/5086; D06L1/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A PROCESS FOR DRY CLEANING A SOILED TEXTILE FABRIC OR FIBER WHICH COMPRISES CONTACTING SAID TEXTILE FABRIC OR FIBER WITH THE MIXTURE COMPRISING ABOUT 87.0 TO ABOUT 88.9 WEIGHT PERCENT TETRACHLORODIFLUOROETHANE, ABOUT 7.0 TO ABOUT 11.0 WEIGHT PERCENT TERTIARY AMYL ALCOHOL AND ABOUT 0.1 TO ABOUT 6.0 WEIGHT PERCENT WATER IN THE LIQUID PHASE AND EVAPORTING THE LIQUID WHICH ADHERES TO THE TEXTILE FABRIC OR FIBER, THEREBY REMOVING THE TERTIARY AMYL ALCOHOL IN A NON-FLAMMABLE AZEOTROPIC COMPOSITION CONTANING TETRACHLORODIFLUOROETHANE.
Claim 2
Dependent Claim
79 words
A PROCESS FOR DRY CLEANING A SOILED TEXTILE FABRIC OR FIBER WHICH COMPRISES CONTACTING SAID TEXTILE FABRIC OR FIBER WITH THE MIXTURE COMPRISING ABOUT 87.0 TO ABOUT 88.9 WEIGHT PERCENT TETRACHLORODIFLUOROETHANE, ABOUT 7.0 TO ABOUT 11.0 WEIGHT PERCENT TERTIARY AMYL ALCOHOL AND ABOUT 0.1 TO ABOUT 6.0 WEIGHT PERCENT WATER IN THE LIQUID PHASE AND EVAPORTING THE LIQUID WHICH ADHERES TO THE TEXTILE FABRIC OR FIBER, THEREBY REMOVING THE TERTIARY AMYL ALCOHOL IN A NON-FLAMMABLE AZEOTROPIC COMPOSITION CONTANING TETRACHLORODIFLUOROETHANE.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 1 wherein the mixture contains about 0.1 to about 1.0 weight percent water.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1 wherein the tetrachlorodifluoroethane is a mixture of 1,1,2,2-tetrachloro-1, 2-difluoroethane and 1,1,1,2-tetrachloro-2,2-difluoroethane in a mol ratio of about 69:31.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 1 wherein the textile fabric or fiber and the mixture are contacted in the presence of a non-volatile organic detergent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |