US4961869A
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US
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Ternary azeotropic compositions of 2,3-dichloro-1,1,1,3,3-pentafluoropropane with trans-1,2-dichloroethylene and methanol
Assignee: EIDP Inc
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Filing: 1989-08-03
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Granted: 1990-10-09
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Expires: 2009-08-03
Abstract
Abstract Azeotropic mixtures of 2,3-dichloro-1,1,1,3,3-pentafluoropropane (HCFC-225da) and trans-1,2-dichloroethylene (HCC-1130) with methanol, the azeotropic mixtures being useful in solvent cleaning applications.
Inventors
- 👤 Michael E. Eggers
- 👤 Abid N. Merchant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:15
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; 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; C23G5/02825; C23G5/02841; C23G5/02851
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
38 words
The azeotropic composition consisting essentially of from about 43-53 weight percent 2,3-dichloro-1,1,1,3,3-pentafluoropropane, about 42-52 weight percent trans-1,2-dichloroethylene and about 3-9 weight percent methanol wherein the composition has a boiling point of about 41.0° C. at substantially atmospheric pressure.
Claim 2
Dependent Claim
38 words
The azeotropic composition consisting essentially of from about 43-53 weight percent 2,3-dichloro-1,1,1,3,3-pentafluoropropane, about 42-52 weight percent trans-1,2-dichloroethylene and about 3-9 weight percent methanol wherein the composition has a boiling point of about 41.0° C. at substantially atmospheric pressure.
Claim 3
Dependent Claim
27 words
The azeotropic composition of claim 1 wherein the composition is about 47.7 weight percent 2,3-dichloro-1,1,1,3,3-pentafluoropropane, and about 46.7 weight percent trans-1,2-dichloroethylene and about 5.6 weight percent methanol.
Claim 4
Dependent Claim
18 words
A process for cleaning a solid surface comprises treating said surface with the azeotropic composition of claim 1.
Claim 5
Dependent Claim
19 words
The process of claim 3, wherein the solid surface is a printed circuit board contaminated with flux and flux-residues.
Claim 6
Dependent Claim
12 words
The process of claim 4, wherein the solid surface is a metal.
References Cited (Backward Citations)
US4582733A
Cited
US4828751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |