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US4804493A
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Stabilized azeotrope or azeotrope-like composition of 1,1,2-trichloro-1,2,2-trifluoroethane and trans-1,2-dichloroethylene
Assignee: EIDP Inc
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Filing: 1988-05-24
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Granted: 1989-02-14
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Expires: 2008-05-24
Abstract
Abstract A stabilized azeotrope or azeotrope-like composition is disclosed with 1,1,2-trichloro-1,2,2-trifluoroethane and trans-1,2-dichloroethylene containing effective stabilizing amounts of lower alkoxyphenol, 1,2-butylene oxide, nitromethane and/or 1,2-propylene oxide.
Inventors
- 👤 Robert A. Gorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:41
CPC Classifications
H; H05; H05K; H05K3/00; C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/504; C11D7/5059
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
47 words
A stabilized azeotrope composition comprising from about 54 to about 64 percent by weight of 1,1,2-trichloro-1,2,2-trifluoroethane and from about 36 to about 46 percent by weight of trans-1,2-dichloroethylene and effective stabilizing amounts of a lower alkoxyphenol, 1,2-butylene oxide and at least one of nitromethane and 1,2-propylene oxide.
Claim 2
Dependent Claim
47 words
A stabilized azeotrope composition comprising from about 54 to about 64 percent by weight of 1,1,2-trichloro-1,2,2-trifluoroethane and from about 36 to about 46 percent by weight of trans-1,2-dichloroethylene and effective stabilizing amounts of a lower alkoxyphenol, 1,2-butylene oxide and at least one of nitromethane and 1,2-propylene oxide.
Claim 3
Dependent Claim
65 words
The composition of claim 1 wherein said alioxyphenol is present in concentration from about 0.001 to about 1 weight percent, said 1,2-butylene oxide is present in concentration from about 0.01 to about 1 weight percent, said nitromethane is present in concentration from about 0.025 to about 3 weight percent and said 1,2-propylene oxide is present in concentration from about 0.01 to about 1 weight percent.
Claim 4
Dependent Claim
10 words
The composition of claim 2 wherein said alkoxyphenol is 4-methoxyphenol.
Claim 5
Dependent Claim
13 words
The composition of claim 1 wherein both nitromethane and 1,2-propylene oxide are present.
Claim 6
Dependent Claim
36 words
The composition of claim 4 wherein said nitromethane is present in concentration from about 0.025 to about 1 weight percent and said 1,2-propylene oxide is present in concentration from about 0.01 to about 1 weight percent.
Claim 7
Dependent Claim
17 words
The composition of claim 5 wherein the weight ratio of nitromethane to 1,2-propylene oxide is about 2:1.
Claim 8
Dependent Claim
20 words
The composition of claim 1 wherein said nitromethane is present in concentration from about 0.1 to about 3 weight percent.
Claim 9
Dependent Claim
19 words
The composition of claim 1 wherein said 1,2-propylene oxide in concentration from about 0.1 to about 1 weight percent.
Claim 10
Dependent Claim
29 words
The composition of claim 1 wherein the amount of said 1,1,2-trichloro-1,2,2-trifluoroethane is about 59 percent by weight and the amount of said trans-1,2-dichloroethylene is about 41 percent by weight.
Claim 11
Dependent Claim
65 words
The composition of claim 9 wherein said alkoxyphenol is present in concentration from about 0.001 to about 1 weight percent, said 1,2-butylene oxide is present in concentration from about 0.01 to about 1 weight percent, said nitromethane is present in concentration from about 0.025 to about 3 weight percent and said 1,2-propylene oxide is present in concentration from about 0.01 to about 1 weight percent.
Claim 12
Dependent Claim
10 words
The composition of claim 9 wherein said alkoxyphenol is 4-methoxyphenol.
Claim 13
Dependent Claim
13 words
The composition of claim 9 wherein both nitromethane and 1,2-propylene oxide are present.
Claim 14
Dependent Claim
36 words
The composition of claim 12 wherein said nitromethane is present in concentration from about 0.01 to about 1 weight percent and said 1,2-propylene oxide is present in concentration from about 0.01 to about 1 weight percent.
Claim 15
Dependent Claim
17 words
The composition of claim 13 wherein the weight ratio of nitromethane to 1,2-propylene oxide is about 2:1.
Claim 16
Dependent Claim
20 words
The composition of claim 9 wherein said nitromethane is present in concentration from about 0.1 to about 3 weight percent.
Claim 17
Dependent Claim
19 words
The composition of claim 9 wherein said 1,2-propylene oxide in concentration from about 0.1 to about 1 weight percent.
References Cited (Backward Citations)
US3349039A
Cited
US3455835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |