US4052328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotrope-like compositions of trichlorotrifluoroethane, ethanol, isopropanol and nitromethane
Assignee: Honeywell International Inc
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Filing: 1976-11-16
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Granted: 1977-10-04
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Expires: 1996-11-16
Abstract
Abstract Solvent cleaning compositions composed of azeotrope-like mixtures of 1,1,2-trichloro-1,2,2-trifluoroethane, ethanol, isopropanol and nitromethane.
Inventors
- 👤 Francis J. Figiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:30
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C11D7/5095
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
Azeotrope-like compositions comprising about 94.8 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 2.4 weight percent ethanol, about 0.9 weight percent isopropanol and about 1.9 weight percent nitromethane.
Claim 2
Dependent Claim
24 words
Azeotrope-like compositions comprising about 94.8 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 2.4 weight percent ethanol, about 0.9 weight percent isopropanol and about 1.9 weight percent nitromethane.
Claim 3
Dependent Claim
12 words
Azeotrope-like compositions which consist essentially of the compositions defined in claim 1.
Claim 4
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 5
Dependent Claim
26 words
The method of cleaning a solid surface as described in claim 3 in which the solid surface is a printed circuit board contaminated with solder flux.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |