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US4476036A Expired / Lapsed US ⏱️ 0.0 years remaining

Quaternary 1,1,2-trichloro-1,2,2-trifluoro azeotropic cleaning composition

Assignee: Honeywell International Inc
•
Filing: 1983-09-12
•
Granted: 1984-10-09
•
Expires: 2003-09-12
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Abstract

Abstract Quaternary azeotropic mixtures of 1,1,2-trichloro-1,2,2-trifluoroethane, methylene chloride, methanol and cyclopentane are provided. These azeotropic mixtures are useful as solvents to remove buffing compounds residues. These mixtures are useful not only because of their high solvency characteristics but also because they exhibit essentially the constant boiling characteristics of an azeotrope which is formed between these components, thereby facilitating handling and purification of the solvent mixtures without significantly altering their compositions. [The quaternary mixtures disclosed herein exhibit certain advantageous solvency characteristics of glycol based compositions, over the known binary or ternary azeotropic systems containing 1,1,2-trichloro-1,2,2-trifluoroethane, methylene chloride, methanol and cyclopentane.

Inventors

  • 👤 Francis J. Figiel
  • 👤 Aaron Colbert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 17:49
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/509; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 39 words
An azeotropic mixture consisting essentially of about 44 to 48 parts 1,1,2-trichloro-1,2,2-trifluoroethane, about 42 to 47 parts methylene chloride, about 4.5 to 5.5 parts cyclopentane and about 4.0 to 4.5 parts methanol, said parts being on a weight basis.
Claim 2
Dependent Claim 39 words
An azeotropic mixture consisting essentially of about 44 to 48 parts 1,1,2-trichloro-1,2,2-trifluoroethane, about 42 to 47 parts methylene chloride, about 4.5 to 5.5 parts cyclopentane and about 4.0 to 4.5 parts methanol, said parts being on a weight basis.
Claim 3
Dependent Claim 35 words
An azeotropic mixture of atmospheric conditions consisting essentially of about 45.5 parts of 1,1,2-trichloro-1,2,2-Trifluoroethane, about 45 parts methylene chloride, about 5.2 parts cyclopentane and about 4.3 parts methanol, said parts being on a weight basis.
Claim 4
Dependent Claim 35 words
An azeotropic mixture of atmospheric conditions consisting essentially of about 45.5 parts of 1,1,2-trichloro-1,2,2-Trifluoroethane, about 45 parts methylene chloride, about 5.2 parts cyclopentane and about 4.3 parts methanol, said parts being on a weight basis.
Claim 5
Independent Claim 61 words
A method of cleaning a surface by contacting said surface with an azeotropic mixture consisting essentially of about 42 to 47 parts 1,1,2-trichloro-1,2,2-trifluoroethane, about 42 to 47 parts methylene chloride, about 4.5 to 5.5 parts cyclopentane and about 4.0 to 4.5 parts methanol on a weight basis at a boiling temperature of about 33°-34° C. at about 760 mm Hg pressure.
Claim 6
Independent Claim 61 words
A method of cleaning a surface by contacting said surface with an azeotropic mixture consisting essentially of about 42 to 47 parts 1,1,2-trichloro-1,2,2-trifluoroethane, about 42 to 47 parts methylene chloride, about 4.5 to 5.5 parts cyclopentane and about 4.0 to 4.5 parts methanol on a weight basis at a boiling temperature of about 33°-34° C. at about 760 mm Hg pressure.
Claim 7
Dependent Claim 19 words
A method according to claim 3 as applied to the removal of buffing compositions from a work piece surface.
Claim 8
Dependent Claim 19 words
A method according to claim 3 wherein the surface to be cleansed is that of an aluminum memory disc.

References Cited (Backward Citations)

US2999817A Cited
US3400077A Cited
US3607767A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-10-09 1988-04-09 1988-10-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-10-09 1992-04-09 1992-10-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-10-09 1996-04-09 1996-10-09 $7700.00 Window Closed / Lapsed

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