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US4816176A
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Azeotrope-like compositions of dichlorotrifluoroethane, methanol and nitromethane
Assignee: Honeywell International Inc
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Filing: 1988-04-04
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Granted: 1989-03-28
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Expires: 2008-04-04
Abstract
Abstract Azeotrope-like compositions comprising dichlorotrifluoroethane, methanol and nitromethane are stable and have utility as degreasing agents and as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing of printed circuit boards.
Inventors
- 👤 Earl A. E. Lund
- 👤 Rajat S. Basu
- 👤 David P. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:42
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5072; C11D7/509
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
Azeotrope-like compositions consisting essentially of dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, methanol and nitromethane wherein the compositions with 2,2-dichloro-1,1,1-trifluoroethane have boiling points of about 27.2° C.±1° C. at about 760 mm Hg±2 mm Hg and the compositions with 1,2-dichloro-1,1,2-trifluoroethane have boiling points of about 30.6° C.±1° C. at about 760 mm Hg±22 mm Hg.
Claim 2
Dependent Claim
58 words
Azeotrope-like compositions consisting essentially of dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, methanol and nitromethane wherein the compositions with 2,2-dichloro-1,1,1-trifluoroethane have boiling points of about 27.2° C.±1° C. at about 760 mm Hg±2 mm Hg and the compositions with 1,2-dichloro-1,1,2-trifluoroethane have boiling points of about 30.6° C.±1° C. at about 760 mm Hg±22 mm Hg.
Claim 3
Dependent Claim
13 words
Azeotrope-like compositions according to claim 1 in which the dichlorotrifluoroethane component is 2,2-dichloro-1,1,1-trifluoroethane.
Claim 4
Dependent Claim
13 words
Azeotrope-like compositions according to claim 1 in which the dichlorotrifluoroethane component is 1,2-dichloro-1,l,2-trifluoroethane.
Claim 5
Dependent Claim
42 words
Azeotrope-like compositions consisting essentially of from about 97.0 to about 99.0 weight percent dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, from about 2.4 to about 0.6 weight percent methanol and from about 0.2 to about 0.01 weight percent nitromethane.
Claim 6
Dependent Claim
42 words
Azeotrope-like compositions consisting essentially of from about 97.0 to about 99.0 weight percent dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, from about 2.4 to about 0.6 weight percent methanol and from about 0.2 to about 0.01 weight percent nitromethane.
Claim 7
Dependent Claim
32 words
Azeotrope-like compositions according to claim 4 consisting essentially of about 98.8 to about 99.0 weight percent 2,2-dichloro-1,1,1-trifluoroethane, from about 1.2 to about 1.0 weight percent methanol and about 0.01 weight percent nitromethane.
Claim 8
Dependent Claim
25 words
Azeotrope-like compositions according to claim 4 consisting essentially of about 97.7 weight percent 1,2-dichloro-1,1,2-trifluoroethane, about 2.3 weight percent methanol and about 0.02 weight percent nitromethane.
Claim 9
Dependent Claim
20 words
Azeotrope-like compositions according to claim 2 which boil at about 27.2° C.±0.6° C. at about 760 mm Hg±25 mm Hg.
Claim 10
Dependent Claim
20 words
Azeotrope-like compositions according to claim 3 which boil at about 30.6° C.±0.6° C. at about 760 mm Hg±25 mm Hg.
Claim 11
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 12
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 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 3.
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 4.
References Cited (Backward Citations)
US3940342A
Cited
US4002573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |