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US3671445A Expired / Lapsed US ⏱️ 0.0 years remaining

Azeotropic composition

Assignee: Union Carbide Corp
•
Filing: 1970-06-02
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Granted: 1972-06-20
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Expires: 1990-06-02
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Abstract

Abstract It is not intended that the following abstract of the disclosure be construed as limiting the invention in any manner. The disclosure relates to binary azeotropic mixtures of tetrachlorodifluoroethane and methanol. It has also been discovered that n-butanol or isobutanol or sec-butanol will form azeotropes with these halogenated solvents. The disclosure also relates to ternary azeotropes of tetrachlorodifluoroethane and trichloroethylene with methanol. It has also been discovered that ethanol or isopropanol will also form ternary azeotropes with these two halogenated solvents. In a further embodiment ternary azeotropes are disclosed comprising tetrachlorodifluoroethane, trichloroethane and methanol. It has also been discovered that ethanol and isopropanol will also form ternary azeotropes with these two halogenated solvents.

Inventors

  • 👤 J Allan Schofield
  • 👤 Roger A Delano

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 18:58
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02822; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C23G5/02806

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 17 words
A method for cleaning a solid surface comprising contacting said surface with the composition of claim 1.
Claim 2
Dependent Claim 14 words
A method in accordance with claim 2 wherein said composition is in vapor form.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-06-20 1975-12-20 1976-06-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-06-20 1979-12-20 1980-06-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-06-20 1983-12-20 1984-06-20 $7700.00 Window Closed / Lapsed

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