Patent US4309296A successfully refreshed from Google Patents.
US4309296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerant mixture
Assignee: Daikin Industries Ltd
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Filing: 1979-11-13
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Granted: 1982-01-05
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Expires: 1999-11-13
Abstract
Abstract A refrigerant comprising a mixture of chlorodifluoromethane and diffluoromethane.
Inventors
- 👤 Naonori Enjo
- 👤 Hideki Aomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:51
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; F; F25; F25B; F25B2400/00; F25B2400/12; Y; Y02; Y02P; Y02P20/00; Y02P20/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
A refrigerant consisting essentially of a mixture of chlorodifluoromethane and difluoromethane, the proportion of difluoromethane being 5 to 25% by weight based on the amount of the refrigerant.
Claim 2
Dependent Claim
28 words
A refrigerant consisting essentially of a mixture of chlorodifluoromethane and difluoromethane, the proportion of difluoromethane being 5 to 25% by weight based on the amount of the refrigerant.
Claim 3
Dependent Claim
12 words
A refrigerator in which the refrigerant claimed in claim 1 is used.
References Cited (Backward Citations)
US3336763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |