US4428854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorption refrigerant compositions for use in absorption refrigeration systems
Assignee: Daikin Industries Ltd
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Filing: 1982-11-15
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Granted: 1984-01-31
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Expires: 2002-11-15
Abstract
Abstract An absorption refrigerant composition for use in absorption refrigeration systems comprising 1,1,1,2-tetrafluoroethane and an organic solvent capable of dissolving the ethane.
Inventors
- 👤 Naonori Enjo
- 👤 Hideki Aomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:27
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/047
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
55 words
An absorption refrigerant composition comprising 1,1,1,2-tetrafluoroethane and at least one organic solvent selected from the group consisting of tetraethylene glycol dimethyl ether, dimethylformamide, methyl ethyl ketone, methyl tetrahydrofurfuryl ether, ethyl tetrahydrofurfuryl ether and butyl tetrahydrofurfuryl ether, said 1,1,1,2-tetrafluoroethane being present in an amount of at least 40 wt.% based on the weight of the composition.
Claim 2
Dependent Claim
55 words
An absorption refrigerant composition comprising 1,1,1,2-tetrafluoroethane and at least one organic solvent selected from the group consisting of tetraethylene glycol dimethyl ether, dimethylformamide, methyl ethyl ketone, methyl tetrahydrofurfuryl ether, ethyl tetrahydrofurfuryl ether and butyl tetrahydrofurfuryl ether, said 1,1,1,2-tetrafluoroethane being present in an amount of at least 40 wt.% based on the weight of the composition.
Claim 3
Dependent Claim
16 words
An absorption refrigerant composition according to claim 1 consisting essentially of said 1,1,1,2-tetrafluoroethane and said solvent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |