Patent US2526523A successfully refreshed from Google Patents.
Patent US4261847A successfully refreshed from Google Patents.
US4261847A
Expired / Lapsed
US
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Refrigerant compositions
Assignee: EIDP Inc
•
Filing: 1979-06-25
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Granted: 1981-04-14
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Expires: 1999-06-25
Abstract
Abstract A composition useful as a refrigerant comprising a mixture of bromotrifluoromethane (R-13B1) and 1,1-difluoroethane (R-152a).
Inventors
- 👤 William D. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C09K2205/00; C09K2205/10; C09K2205/12; C09K2205/122
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
A composition of matter consisting essentially of about 50 to 70% by weight of bromotrifluoromethane and about 50 to 30% by weight of 1,1-difluoroethane.
Claim 2
Dependent Claim
24 words
A composition of matter consisting essentially of about 50 to 70% by weight of bromotrifluoromethane and about 50 to 30% by weight of 1,1-difluoroethane.
Claim 3
Dependent Claim
22 words
The composition of claim 1 in which there is about 60% by weight of bromotrifluoromethane and about 40% by weight of 1,1-difluoroethane.
References Cited (Backward Citations)
US2531373A
Cited
GB645096A
Cited
US2641579A
Cited
US2938362A
Cited
US3418242A
Cited
US3336763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |