US4873015A
Expired / Lapsed
US
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Azeotrope-like compositions of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol, nitromethane and dimethoxymethane
Assignee: Honeywell International Inc
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Filing: 1988-10-31
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Granted: 1989-10-10
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Expires: 2008-10-31
Abstract
Abstract Azeotrope-like compositions comprising 1,1,2-trichloro-1,2,2-trifluoroethane, methanol, nitromethane and dimethoxymethane are stable and have utility as degreasing agents and as solvents in a variety of industrial cleaning applications including the defluxing of printed circuit boards.
Inventors
- 👤 Ellen L. Swan
- 👤 Rajat S. Basu
- 👤 Earl A. E. Lund
- 👤 David P. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:32
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5086
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
33 words
Azeotrope-like compositions consisting essentially of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol, nitromethane and at least about 14.5 weight percent dimethoxymethane wherein said compositions have a boiling point of about 39.7° C. ±1° C. at 760 mm Hg.
Claim 2
Dependent Claim
33 words
Azeotrope-like compositions consisting essentially of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol, nitromethane and at least about 14.5 weight percent dimethoxymethane wherein said compositions have a boiling point of about 39.7° C. ±1° C. at 760 mm Hg.
Claim 3
Dependent Claim
42 words
Azeotrope-like compositions consisting essentially of from about 73.8 to about 80.4 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, from about 4.9 to about 5.8 weight percent methanol, from about 0.02 to about 0.2 weight percent nitromethane, and from about 14.5 to about 20.3 weight percent dimethoxymethane.
Claim 4
Dependent Claim
42 words
Azeotrope-like compositions consisting essentially of from about 73.8 to about 80.4 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, from about 4.9 to about 5.8 weight percent methanol, from about 0.02 to about 0.2 weight percent nitromethane, and from about 14.5 to about 20.3 weight percent dimethoxymethane.
Claim 5
Dependent Claim
55 words
Azeotrope-like compositions according to claim 2 wherein said weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane is from about 76.5 to about 80.3, said weight percent of methanol is from about 5.0 to about 5.3, said weight percent of nitromethane is from about 0.02 to about 0.2, said weight percent of dimethoxymethane is from about 14.5 to about 18.5.
Claim 6
Dependent Claim
55 words
Azeotrope-like compositions according to claim 2 wherein said weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane is from about 79.2 to about 80.3, said weight percent of methanol is from about 5.0 to about 5.3, said weight percent of nitromethane is from about 0.02 to about 0.2, said weight percent of dimethoxymethane is from about 14.5 to about 15.2.
Claim 7
Dependent Claim
13 words
Azeotrope-like compositions according to claim 3 consisting of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol, nitromethane and dimethoxymethane.
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 6 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 7 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 8 in which the solid surface is a printed circuit board contaminated with solder flux.
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) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |