US4816174A
Expired / Lapsed
US
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Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, methanol and nitromethane
Assignee: Honeywell International Inc
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Filing: 1988-05-03
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Granted: 1989-03-28
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Expires: 2008-05-03
Abstract
Abstract Azeotrope-like compositions comprising 1,1-dichloro-1-fluoroethane, 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
- 👤 Robert G. Richard
- 👤 Ian R. Shankland
- 👤 David P. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:27
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
26 words
Azeotrope-like compositions consisting essentially of 1,1-dichloro-1-fluoroethane, methanol and nitromethane wherein said compositions have a boiling point of about 29.4° C.±0.1° C. at about 760 mm Hg.
Claim 2
Dependent Claim
26 words
Azeotrope-like compositions consisting essentially of 1,1-dichloro-1-fluoroethane, methanol and nitromethane wherein said compositions have a boiling point of about 29.4° C.±0.1° C. at about 760 mm Hg.
Claim 3
Dependent Claim
33 words
Azeotrope-like compositions consisting essentially of from about 93.0 to about 98.0 weight percent 1,1-dichloro-1-fluoroethane, from about 7 to about 2 weight percent methanol and from about 0.1 to about 0.01 weight percent nitromethane.
Claim 4
Dependent Claim
33 words
Azeotrope-like compositions consisting essentially of from about 93.0 to about 98.0 weight percent 1,1-dichloro-1-fluoroethane, from about 7 to about 2 weight percent methanol and from about 0.1 to about 0.01 weight percent nitromethane.
Claim 5
Dependent Claim
35 words
Azeotrope-like compositions according to claim 2 comprising from about 95.0 to about 97.0 weight percent 1,1-dichloro-1-fluoroethane, from about 5 to about 3 weight percent methanol and from about 0.1 to about 0.01 weight percent nitromethane.
Claim 6
Dependent Claim
23 words
Azeotrope-like compositions according to claim 3 comprising about 96.0 weight percent 1,1-dichloro-1-fluoroethane, about 3.9 weight percent methanol, and about 0.01 weight percent nitromethane.
Claim 7
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 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 2.
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 3.
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 4.
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) | 1992-03-27 | 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 |