US5108637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-component refrigerant
Assignee: Star Refrigeration Ltd
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Filing: 1990-08-24
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Granted: 1992-04-28
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Expires: 2010-08-24
Abstract
Abstract A three component refrigerant composition for use in vapour compression refrigerators and avoiding the use of ozone-depleting chlorofluorocarbons comprises a three component mixture of: (i) a major portion comprised of chlorodifluoromethane (R22) or pentafluoroethane (R125); (ii) R125 or octafluoropropane (R218); and (iii) propane in non-flammable proportions.o
Inventors
- 👤 Stephen F. Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:05
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; C09K2205/128
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
A non-flammable refrigerant composition for use in a refrigerant apparatus which comprises a mixture of three different components: (i) 65 to 93 wt% chlorodifluoromethane (R22); (ii) 3 to 15 wt% propane (R290); and (iii) the balance octafluoropropane (R218); in non-flammable proportions.
Claim 2
Dependent Claim
41 words
A non-flammable refrigerant composition for use in a refrigerant apparatus which comprises a mixture of three different components: (i) 65 to 93 wt% chlorodifluoromethane (R22); (ii) 3 to 15 wt% propane (R290); and (iii) the balance octafluoropropane (R218); in non-flammable proportions.
Claim 3
Dependent Claim
24 words
A composition according to claim 1 which comprises: (i) 83-93 wt% of R22; (ii) 3-9 wt% of R218; and (iii) 3-9 wt% of propane.
Claim 4
Dependent Claim
16 words
A vapour compression refrigeration apparatus which employs as refrigerant medium a composition according to claim 1.
Claim 5
Independent Claim
46 words
A method of performing vapour compression refrigeration comprising compressing and condensing a non-flammable refrigerant composition which comprises a mixture of three different components: (i) 65 to 93 wt% chlorodifluoromethane (R22); (ii) 3 to 15 wt% propane (R290); and (iii) the balance octafluoropropane (R218); in non-flammable proportions.
Claim 6
Independent Claim
46 words
A method of performing vapour compression refrigeration comprising compressing and condensing a non-flammable refrigerant composition which comprises a mixture of three different components: (i) 65 to 93 wt% chlorodifluoromethane (R22); (ii) 3 to 15 wt% propane (R290); and (iii) the balance octafluoropropane (R218); in non-flammable proportions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |