US4268407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning composition
Assignee: Imperial Chemical Industries Ltd
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Filing: 1980-02-20
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Granted: 1981-05-19
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Expires: 2000-02-20
Abstract
Abstract A composition for cleaning printed circuit boards contains 92 to 95 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, 5 to 7 weight percent methanol and 0.05 to 1 weight percent methyl acetate.
Inventors
- 👤 David G. Hey
- 👤 Robert W. Wheelhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:57
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/26; C11D7/261; C11D7/50; C11D7/5004; C11D7/5018; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5086; C11D7/266; C11D7/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
A cleaning composition consisting essentially of 92 to 95 weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane, 5 to 7 weight percent of methanol and 0.05 to 1 weight percent of methyl acetate.
Claim 2
Dependent Claim
29 words
A cleaning composition consisting essentially of 92 to 95 weight percent of 1,1,2-trichloro-1,2,2-trifluoroethane, 5 to 7 weight percent of methanol and 0.05 to 1 weight percent of methyl acetate.
Claim 3
Dependent Claim
25 words
A cleaning composition as claimed in claim 1 consisting essentially of 93.5 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, 6.3 weight percent methanol and 0.2 weight percent methyl acetate.
Claim 4
Dependent Claim
23 words
A cleaning composition as claimed in claim 1 or claim 2 in which there is also incorporated 0.2 to 1 weight percent nitromethane.
Claim 5
Dependent Claim
22 words
A cleaning composition as claimed in claim 1 or claim 2 in which there is also incorporated about 0.05 weight percent nitromethane.
Claim 6
Dependent Claim
32 words
A cleaning composition as claimed in claim 1 or claim 2 consisting essentially of 93.5 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, 6.5 weight percent methanol, 0.03 weight percent methyl acetate and 0.06 weight percent nitromethane.
Claim 7
Dependent Claim
22 words
A method of cleaning contaminated articles by contacting the contaminated articles with a cleaning composition according to claim 1 or claim 3.
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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |