Patent US4599187A successfully refreshed from Google Patents.
US4599187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning compositions based on trichlorotrifluoroethane and alcohols
Assignee: Imperial Chemical Industries Ltd
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Filing: 1983-03-02
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Granted: 1986-07-08
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Expires: 2003-03-02
Abstract
Abstract A cleaning composition suitable for removing ionic flux residues from printed circuit boards comprises an approximate azeotropic mixture of 1,1,2-trichloro-1,2,2-trifluoroethane and an aliphatic alcohol having from 1 to 3 carbon atoms containing as additives and aliphatic alcohol having from 4 to 6 carbon atoms, preferably isobutyl alcohol, and a polyol, preferably ethylene glycol. Contaminated articles are cleaned by bringing them into contact with the cleaning composition which preferably is employed at the boil.
Inventors
- 👤 David G. Hey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:56
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819; H; H05; H05K; H05K3/00; H05K3/22; H05K3/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A cleaning composition comprising 1,1,2-trichloro-1,2,2-trifluoroethane and a monohydric lower aliphatic alcohol having from 1 to 3 carbon atoms and containing additives and which boils within ±2° C. of the boiling point of the azeotropic mixture of the 1,1,2-trichlor-1,2,2-trifluoroethane and the aliphatic alcohol having from 1 to 3 carbon atoms, the additives each being present in an amount of from 0.5 to 4% by weight and being a monohydric aliphatic alcohol having from 4 to 6 carbon atoms and ethylene glycol.
Claim 2
Dependent Claim
80 words
A cleaning composition comprising 1,1,2-trichloro-1,2,2-trifluoroethane and a monohydric lower aliphatic alcohol having from 1 to 3 carbon atoms and containing additives and which boils within ±2° C. of the boiling point of the azeotropic mixture of the 1,1,2-trichlor-1,2,2-trifluoroethane and the aliphatic alcohol having from 1 to 3 carbon atoms, the additives each being present in an amount of from 0.5 to 4% by weight and being a monohydric aliphatic alcohol having from 4 to 6 carbon atoms and ethylene glycol.
Claim 3
Dependent Claim
31 words
A cleaning composition as claimed in claim 1 wherein the amount of the alcohol having from 4 to 6 carbon atoms is from 0.5% to 4% by weight of the composition.
Claim 4
Dependent Claim
25 words
A cleaning composition as claimed in claim 1 wherein the amount of the ethylene glycol is from 0.5% to 4% by weight of the composition.
Claim 5
Dependent Claim
21 words
A cleaning composition as claimed in claim 1 wherein the alcohol having from 4 to 6 carbon atoms is isobutyl alcohol.
Claim 6
Dependent Claim
13 words
A cleaning composition as claimed in claim 1 which also contains a nitroalkane.
Claim 7
Dependent Claim
22 words
A method of cleaning contaminated articles which comprises bringing the articles into contact with a cleaning composition as claimed in claim 1.
Claim 8
Dependent Claim
19 words
A method as claimed in claim 6 wherein after cleaning the articles are rinsed with a composition comprising 1,1,2-trichloro-1,2,2-trifluoroethane.
Claim 9
Dependent Claim
18 words
A method as claimed in claim 6 or 7 wherein the cleaning composition is employed at the boil.
Claim 10
Dependent Claim
24 words
A method for the removal of water from articles which comprises bringing the articles into contact with a composition as claimed in claim 1.
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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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |