US3932297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent compositions for cleaning
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-01-14
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Granted: 1976-01-13
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Expires: 1994-01-14
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.
Inventors
- 👤 John Joseph Clementson
- 👤 Arisztid Lajos Horvath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:29
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/005; B01J8/18; B01J8/1845; B01J8/1863; C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02806
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
An azeotropic composition consisting essentially of 1,1,1-trichloroethane and n-propanol wherein the proportion of n-propanol is 7.1% by weight of the composition, said composition having a boiling point of 72.3°C.
Claim 2
Dependent Claim
29 words
An azeotropic composition consisting essentially of 1,1,1-trichloroethane and n-propanol wherein the proportion of n-propanol is 7.1% by weight of the composition, said composition having a boiling point of 72.3°C.
Claim 3
Dependent Claim
30 words
A method of cleaning articles in which the article is a printed circuit board contaminated with soldering flux and in which the solvent composition is as claimed in claim 1.
Claim 4
Dependent Claim
15 words
A method of cleaning articles as claimed in claim 1 when using the kiss-cleaning technique.
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |