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US4683075A
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Azeotrope-like compositions of trichlorotrifluoroethane, methanol, nitromethane, acetone, and methyl acetate
Assignee: Honeywell International Inc
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Filing: 1986-07-23
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Granted: 1987-07-28
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Expires: 2006-07-23
Abstract
Abstract Azeotrope-like compositions comprising of trichlorotrifluoroethane, methanol, nitromethane, acetone, and methyl acetate 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
- 👤 David P. Wilson
- 👤 Hang T. Pham
- 👤 Earl A. E. Lund
- 👤 Rajat S. Basu
- 👤 John W. Pelava
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:36
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5086; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819; C23G5/032
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
10 words
Azeotrope-like compositions comprising trichlorotrifluoroethane, methanol, nitromethane, acetone and methyl acetate.
Claim 2
Dependent Claim
10 words
Azeotrope-like compositions comprising trichlorotrifluoroethane, methanol, nitromethane, acetone and methyl acetate.
Claim 3
Dependent Claim
11 words
Azeotrope-like compositions according to claim 1 wherein said trichlorotrifluoroethane is 1,1,2-trichloro-1,2,2-trifluoroethane.
Claim 4
Dependent Claim
54 words
Azeotrope-like compositions according to claim 2 comprising from about 83.5 to about 93.8 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, from about 5.1 to about 6.4 weight percent methanol, from about 0.01 to about 1.0 weight percent nitromethane, from about 0.3 to about 5.1 weight percent acetone, and from about 0.1 to about 6.0 weight percent methyl acetate.
Claim 5
Dependent Claim
65 words
Azeotrope-like compositions according to claim 2 wherein said weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane is from about 90.5 to about 93.5, said weight percent methanol is from about 5.7 to about 6.1, said weight percent nitromethane is from about 0.05 to about 0.2, said weight percent acetone is from about 0.4 to about 2.0, and said weight percent methyl acetate is from about 0.2 to about 1.7.
Claim 6
Dependent Claim
65 words
Azeotrope-like compositions according to claim 2 wherein said weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane is from about 91.4 to about 93.5, said weight percent methanol is from about 5.8 to about 6.0, said weight percent nitromethane is from about 0.03 to about 0.1, said weight percent acetone is from about 0.6 to about 1.2, and said weight percent methyl acetate is from about 0.4 to about 1.2.
Claim 7
Dependent Claim
45 words
Azeotrope-like compositions according to claim 2 wherein said weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane is about 92.1, said weight percent methanol is about 5.8, said weight percent nitromethane is about 0.1, said weight percent acetone is about 1.2, and said weight percent methyl acetate is about 0.8.
Claim 8
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 9
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 2.
Claim 10
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 3.
Claim 11
Dependent Claim
25 words
The method of cleaning a solid surface according to claim 7 in which the solid surface is a printed circuit board contaminated with solder flux.
Claim 12
Dependent Claim
25 words
The method of cleaning a solid surface according to claim 8 in which the solid surface is a printed circuit board contaminated with solder flux.
Claim 13
Dependent Claim
25 words
The method of cleaning a solid surface according to claim 9 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) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |