Patent US4023984A successfully refreshed from Google Patents.
US4023984A
Expired / Lapsed
US
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Azeotropic solvent composition for cleaning
Assignee: Imperial Chemical Industries Ltd
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Filing: 1975-08-19
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Granted: 1977-05-17
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Expires: 1995-08-19
Abstract
Abstract A solvent composition which comprises 1,1,1-trichloroethane and an aliphatic alcohol containing at least two carbon atoms in amounts such that the composition boils in the range from the boiling point of the constant boiling mixture of 1,1,1-trichloroethane and the alcohol up to 10 DEG C above the boiling point. The solvent composition is used to clean printed circuit boards contaminated with soldering flux.
Inventors
- 👤 John Joseph Clementson
- 👤 Arisztid Lajos Horvath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:28
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02806; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
30 words
An azeotropic composition consisting essentially of 1,1,1-trichloroethane and iso-propanol, wherein the proportion of iso-propanol is 18.2% by weight of the composition, said composition having a boiling point of 68.7° C.
Claim 2
Dependent Claim
30 words
An azeotropic composition consisting essentially of 1,1,1-trichloroethane and iso-propanol, wherein the proportion of iso-propanol is 18.2% by weight of the composition, said composition having a boiling point of 68.7° C.
Claim 3
Dependent Claim
25 words
A method of cleaning a printed circuit board contaminated with soldering flux which comprises contacting said printed circuit board with the composition of claim 1.
References Cited (Backward Citations)
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US3549715A
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US3000978A
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US3671446A
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US3767585A
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US3733218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |