US5059338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Working fluid
Assignee: Panasonic Holdings Corp
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Filing: 1990-11-28
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Granted: 1991-10-22
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Expires: 2010-11-28
Abstract
Abstract A working fluid comprising trifluoromethane, chlorodifluoromethane and at least one halogenated ethane which consists of two carbon atoms, 1 or 2 hydrogen atoms, 0 to 2 chlorine atoms and balance of fluorine atoms and has a boiling point of not lower than -30° C. under atmospheric pressure, which has very small influence on the ozone layer in the stratosphere and is suitable as a substitute working fluid for dichlorodifluoromethane.
Inventors
- 👤 Yuji Yoshida
- 👤 Koji Arita
- 👤 Takeshi Tomizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:33
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: 10
Claim 1
Independent Claim
64 words
A working fluid comprising 1 to 80% by weight of trifluoromethane, 1 to 90% weight of chlorodifluoromethane and 10 to 95% by weight of at least one halogenated ethane which consists of two carbon atoms, 1 or 2 hydrogen atoms, 0 to 2 chlorine atoms and balance of fluorine atoms and has a boiling point of not lower than -30° C. under atmospheric pressure.
Claim 2
Dependent Claim
64 words
A working fluid comprising 1 to 80% by weight of trifluoromethane, 1 to 90% weight of chlorodifluoromethane and 10 to 95% by weight of at least one halogenated ethane which consists of two carbon atoms, 1 or 2 hydrogen atoms, 0 to 2 chlorine atoms and balance of fluorine atoms and has a boiling point of not lower than -30° C. under atmospheric pressure.
Claim 3
Dependent Claim
56 words
The working fluid as claimed in claim 1, which comprises 80% by weight or less of trifluoromethane, 90% by weight or less of chlorodifluoromethane, and 55 to 95% by weight of tetrafluoroethane or 40 to 95% by weight of chlorotetrafluoroethane or 10 to 95% by weight of dichlorotrifluoroethane, with the total amount being 100% by weight.
Claim 4
Dependent Claim
56 words
The working fluid as claimed in claim 1, which comprises 65% by weight or less of trifluoromethane, 85% by weight or less of chlorodifluoromethane, and 65 to 95% by weight of tetrafluoroethane or 50 to 95% by weight of chlorotetrafluoroethane or 15 to 90% by weight of dichlorotrifluoroethane, with the total amount being 100% by weight.
Claim 5
Dependent Claim
32 words
The working fluid as claimed in claim 1, which comprises 25% by weight or less of trifluoromethane, 45% by weight or less of chlorodifluoromethane and 55 to 95% by weight of tetrafluoroethane.
Claim 6
Dependent Claim
32 words
The working fluid as claimed in claim 4, which comprises 15% by weight or less of trifluoromethane, 35% by weight or less of chlorodifluoromethane and 65 to 95% by weight of tetrafluoroethane.
Claim 7
Dependent Claim
32 words
The working fluid as claimed in claim 1, which comprises 35% by weight or less of trifluoromethane, 60% by weight or less of chlorodifluoromethane and 40 to 95% by weight of chlorotetrafluoroethane.
Claim 8
Dependent Claim
32 words
The working fluid as claimed in claim 6, which comprises 25% by weight or less of trifluoromethane, 50% by weight or less of chlorodifluoromethane and 50 to 95% by weight of chlorotetrafluoroethane.
Claim 9
Dependent Claim
32 words
The working fluid as claimed in claim 1, which comprises 80% by weight or less of trifluoromethane, 90% by weight or less of chlorodifluoromethane and 10 to 95% by weight of dichlorotrifluoroethane.
Claim 10
Dependent Claim
32 words
The working fluid as claimed in claim 8, which comprises 65% by weight or less of trifluoromethane, 85% by weight or less of chlorodifluoromethane and 15 to 90% by weight of dichlorotrifluoroethane.
References Cited (Backward Citations)
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EP0272953A1
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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) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |