US4655956A
Expired / Lapsed
US
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Azeotrope-like compositions of trichlorotrifluoroethane, methanol, nitromethane and hexane
Assignee: Honeywell International Inc
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Filing: 1985-10-02
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Granted: 1987-04-07
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Expires: 2005-10-02
Abstract
Abstract Azeotrope-like compositions comprising of trichlorotrifluoroethane, methanol, nitromethane and hexane which are stable and have utility as vapor degreasing agents and as solvents in a variety of industrial cleaning applications including the defluxing of printed circuit boards.
Inventors
- 👤 Rajat S. Basu
- 👤 David P. Wilson
- 👤 Earl A. E. Lund
- 👤 Hang T. Pham
- 👤 John K. Bonner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:23
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/509
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
40 words
Azeotrope-like compositions comprising from about 84.3 to about 93.8 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, from about 5.6 to about 6.6 weight percent methanol, from about 0.05 to about 0.8 weight percent nitromethane, and from about 0.1 to about 8.7 weight percent hexane.
Claim 2
Dependent Claim
40 words
Azeotrope-like compositions comprising from about 84.3 to about 93.8 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, from about 5.6 to about 6.6 weight percent methanol, from about 0.05 to about 0.8 weight percent nitromethane, and from about 0.1 to about 8.7 weight percent hexane.
Claim 3
Dependent Claim
11 words
Azeotrope-like compositions according to claim 1 wherein said hexane is n-hexane.
Claim 4
Dependent Claim
11 words
Azeotrope-like compositions according to claim 1 wherein said hexane is 2-methylpentane.
Claim 5
Dependent Claim
12 words
Azeotrope-like compositions according to claim 1 where in said hexane is 3-methylpentane.
Claim 6
Dependent Claim
11 words
Azeotrope-like compositions according to claim 1 wherein said hexane is 2,2-dimethylbutane.
Claim 7
Dependent Claim
11 words
Azeotrope-like compositions according to claim 1 wherein said hexane is 2,3-dimethylbutane.
Claim 8
Dependent Claim
11 words
Azeotrope-like compositions according to claim 1 wherein said hexane is isohexane.
Claim 9
Dependent Claim
52 words
Azeotrope-like compositions according to claim 1 wherein said weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane is from about 91.2 to about 93.8, said weight percent methanol is from about 5.8 to about 6.2, said weight percent nitromethane is from about 0.05 to about 0.4, said weight percent hexane is from about 0.1 to about 2.4.
Claim 10
Dependent Claim
52 words
Azeotrope-like compositions according to claim 1 wherein said weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane is from about 91.3 to about 92.0, said weight percent methanol is from about 6.0 to about 6.2, said weight percent nitromethane is from about 0.2 to about 0.4, said weight percent hexane is from about 1.8 to about 2.0.
Claim 11
Dependent Claim
37 words
Azeotrope-like compositions according to claim 9 wherein said weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane is about 92.0, said weight percent methanol is about 5.8, said weight percent nitromethane is about 0.3, and said weight percent hexane is about 1.9.
Claim 12
Dependent Claim
11 words
Azeotrope-like compositions according to claim 9 wherein said hexane is isohexane.
Claim 13
Dependent Claim
21 words
The method of cleaning a solid surface which comprises treating said surface with an azeotrope-like composition as defined in claim 1.
Claim 14
Dependent Claim
21 words
The method of cleaning a solid surface which comprises treating said surface with an azeotrope-like composition as defined in claim 8.
Claim 15
Dependent Claim
21 words
The method of cleaning a solid surface which comprises treating said surface with an azeotrope-like composition as defined in claim 9.
Claim 16
Dependent Claim
25 words
The method of cleaning a solid surface according to claim 12 in which the solid surface is a printed circuit board contaminated with solder flux.
Claim 17
Dependent Claim
25 words
The method of cleaning a solid surface according to claim 13 in which the solid surface is a printed circuit board contaminated with solder flux.
Claim 18
Dependent Claim
25 words
The method of cleaning a solid surface according to claim 14 in which the solid surface is a printed circuit board contaminated with solder flux.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |