US4715900A
Expired / Lapsed
US
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Azeotropic compositions of trichlorotrifluoroethane, dichlorodifluoroethane and methanol/ethanol
Assignee: EIDP Inc
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Filing: 1987-01-08
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Granted: 1987-12-29
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Expires: 2007-01-08
Abstract
Abstract Azeotropic mixtures of 1,1,2-trichloro-1,2,2-trifluoroethane (FC-113) and 1,2-dichloro-1,1-difluoroethane (FC-132b) with methanol or ethanol, the azeotropic mixtures being useful in solvent cleaning applications.
Inventors
- 👤 Helen A. Connon
- 👤 Robert A. Gorski
- 👤 William G. Kenyon
- 👤 Akimichi Yokozeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:21
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; H; H05; H05K; H05K3/00; H05K3/22; H05K3/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
22 words
An azeotrope or azeotrope-like composition comprising about 67-81 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane and 15-26 weight percent 1,2-dichloro-1,1difluoroethane and about 3-7 weight percent methanol.
Claim 2
Dependent Claim
22 words
An azeotrope or azeotrope-like composition comprising about 67-81 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane and 15-26 weight percent 1,2-dichloro-1,1difluoroethane and about 3-7 weight percent methanol.
Claim 3
Dependent Claim
22 words
An azeotrope or azeotrope-like composition comprising about 59-66 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane and 31-39 weight percent 1,2-dichloro-1,1-difluroethane and about 2-4 weight percent ethanol.
Claim 4
Dependent Claim
22 words
An azeotrope or azeotrope-like composition comprising about 59-66 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane and 31-39 weight percent 1,2-dichloro-1,1-difluroethane and about 2-4 weight percent ethanol.
Claim 5
Dependent Claim
27 words
The azeotrope or azeotrope-like composition of claim 1 wherein the composition is about 74.1 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, 20.7 weight percent 1,2-dichloro-1,1-difluoroethane and about 5.2 weight percent methanol.
Claim 6
Dependent Claim
23 words
The azeotrope or azeotrope-like composition of claim 1 wherein the composition has a boiling point of about 39.32° C. at substantially atmospheric pressure.
Claim 7
Dependent Claim
27 words
The azeotrope or azeotrope-like composition of claim 2 wherein the composition is about 62.4 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, 34.9 weight percent 1,2-dichloro-1,1-difluoroethane and about 2.7 weight percent ethanol.
Claim 8
Dependent Claim
23 words
The azeotrope or azeotrope-like composition of claim 2 wherein the composition has a boiling point of about 43.18° C. at substantially atmospheric pressure.
Claim 9
Dependent Claim
21 words
A process for cleaning a solid surface which comprises treating said surface with the azeotrope or azeotrope-like composition of claim 1.
Claim 10
Dependent Claim
20 words
The process of claim 7 wherein the solid surface is a printed circuit board contaiminated with flux and flux residues.
Claim 11
Dependent Claim
21 words
A process for cleaning a solid surface which comprises treating said surface with the azeotrope or azeotrope-like composition of claim 2.
Claim 12
Dependent Claim
20 words
The process of claim 9 wherein the solid surface is a printed circuit board contaminated with flux and flux residues.
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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) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |