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Patent US4767561A successfully refreshed from Google Patents.
US4767561A
Expired / Lapsed
US
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Azeotrope or azeotrope-like composition of trichlorotrifluoroethane, methanol and 1,2-dichloroethylene
Assignee: EIDP Inc
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Filing: 1987-09-23
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Granted: 1988-08-30
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Expires: 2007-09-23
Abstract
Abstract Azeotropic admixture of 1,1,2-trichloro-1,2,2- trifluoroethane, methanol, and 1,2-dichloroethylene useful in solvent cleaning applications.
Inventors
- 👤 Robert A. Gorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:12
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/26; C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
An azeotrope or azeotrope-like composition comprising about 64 to 72 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 5 to 7 weight percent methanol and about 23 to 29 weight percent trans-1,2-dichloroethylene.
Claim 2
Dependent Claim
28 words
An azeotrope or azeotrope-like composition comprising about 64 to 72 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 5 to 7 weight percent methanol and about 23 to 29 weight percent trans-1,2-dichloroethylene.
Claim 3
Dependent Claim
39 words
The azeotrope or azeotrope-like composition of claim 1 wherein the composition is about 68 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 6 weight percent methanol and about 26 weight percent trans-1,2-dichloroethylene with a boiling point of about 38.4° C. at atmospheric pressure.
Claim 4
Dependent Claim
34 words
A azeotrope or azeotrope-like composition of comprising about 93 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 6 weight percent methanol and about 1 weight percent cis-1,2-dichloroethylene with a boiling point of about 39.7° C. at atmospheric pressure.
Claim 5
Dependent Claim
34 words
A azeotrope or azeotrope-like composition of comprising about 93 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 6 weight percent methanol and about 1 weight percent cis-1,2-dichloroethylene with a boiling point of about 39.7° C. at atmospheric pressure.
Claim 6
Dependent Claim
21 words
A process for cleaning a solid surface which comprises treating said surfaces with the azeotrope or azeotrope-like composition of claim 1.
Claim 7
Dependent Claim
20 words
The process of claim 4 wherein said solid surface is a printed circuit board contaminated with flux and flux residue.
Claim 8
Dependent Claim
21 words
A process for cleaning a solid surface which comprises treating said surfaces with the azeotrope or azeotrope-like composition of claim 3.
Claim 9
Dependent Claim
20 words
The process of claim 6 wherein said solid surface is a printed circuit board contaminated with flux and flux residue.
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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |