US4983312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerants
Assignee: Daikin Industries Ltd
•
Filing: 1988-09-21
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Granted: 1991-01-08
•
Expires: 2008-09-21
Abstract
Abstract The present invention provides a refrigerant comprising tetrafluoroethane and either chlorodifluoromethane or chlorodifluoroethane.
Inventors
- 👤 Koji Tamura
- 👤 Hiroshi Kashiwagi
- 👤 Masahiro Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:39
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: 5
Claim 1
Independent Claim
24 words
A refrigerant consisting essentially of 95 to 5% by weight of tetrafluoroethane and respectively 5 to 95% by weight of either chlorodifluoromethane or chlorodifluoroethane.
Claim 2
Dependent Claim
24 words
A refrigerant consisting essentially of 95 to 5% by weight of tetrafluoroethane and respectively 5 to 95% by weight of either chlorodifluoromethane or chlorodifluoroethane.
Claim 3
Dependent Claim
25 words
A refrigerant according to claim 1 consisting essentially of 90 to 5% by weight of tetrafluoroethane and respectively 10 to 95% by weight of chlorodifluoromethane.
Claim 4
Dependent Claim
25 words
A refrigerant according to claim 2 consisting essentially of 80 to 20% by weight of tetrafluoroethane and respectively 20 to 80% by weight of chlorodifluoromethane.
Claim 5
Dependent Claim
25 words
A refrigerant according to claim 1 consisting essentially of 80 to 5% by weight of tetrafluoroethane and respectively 20 to 95% by weight of chlorodifluoroethane.
References Cited (Backward Citations)
US3607755A
Cited
US4428854A
Cited
JPS63305185A
Cited
JPS63308084A
Cited
JPS63308085A
Cited
US4810403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |