Patent US3846327A successfully refreshed from Google Patents.
US3846327A
Expired / Lapsed
US
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Azeotropic composition
Assignee: Lyondell Chemical Technology LP
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Filing: 1972-05-30
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Granted: 1974-11-05
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Expires: 1992-05-30
Abstract
Abstract This invention relates to a binary azeotrope of 1,1,2-trichloro1,2,2-trifluoroethane and tertiary butyl alcohol useful as a cleaning solvent.
Inventors
- 👤 J Schofield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:21
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
A CONSTANT BOILING AZEOTROPIC COMPOSITION CONSISTING ESSENTIALLY OF 1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE AND TERTIARY BUTANOL AND BOILING AT 46*C AT ABOUT 760MM. HG.
Claim 2
Dependent Claim
20 words
A CONSTANT BOILING AZEOTROPIC COMPOSITION CONSISTING ESSENTIALLY OF 1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE AND TERTIARY BUTANOL AND BOILING AT 46*C AT ABOUT 760MM. HG.
Claim 3
Dependent Claim
40 words
A constant boiling composition consisting essentially of from about 95 to about 98 parts by weight of 1,1,2-trichloro-1,2,2-trifluoroethane and from about 2 to about 5 parts by weight of tertiary butanol and boiling at 46*C at about 760 mm. Hg.
Claim 4
Dependent Claim
40 words
A constant boiling composition consisting essentially of from about 95 to about 98 parts by weight of 1,1,2-trichloro-1,2,2-trifluoroethane and from about 2 to about 5 parts by weight of tertiary butanol and boiling at 46*C at about 760 mm. Hg.
Claim 5
Dependent Claim
19 words
A method for cleaning a solid surface comprising contacting said surface with an azeotropic composition according to claim 1.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 3 wherein said composition is used in vapor form.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |