Patent US3733850A successfully refreshed from Google Patents.
US3733850A
Expired / Lapsed
US
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Refrigeration heat pump,and heat engine apparatus
Assignee: Chevron USA Inc
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Filing: 1971-12-28
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Granted: 1973-05-22
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Expires: 1991-12-28
Abstract
Abstract An apparatus capable of being employed as a refrigeration, heat pump, or heat engine containing a halogenated alkane working fluid and a lubricant combination of alkylbenzenes containing from 10 to 25 carbon atoms in the alkyl groups and from about 2 to about 50 percent by weight of polyisobutylene having a viscosity in the range of about 3,000 to about 1,000,000 SUS at 100*F.
Inventors
- 👤 S Olund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:07
CPC Classifications
C; C10; C10M; C10M171/00; C10M171/008; C10M111/00; C10M111/04; F; F25; F25B; F25B31/00; F25B31/002; C10M2203/00; C10M2203/06; C10M2203/065; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/0265; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/025; C10M2207/04; C10M2207/042; C10M2215/00; C10M2215/14; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/066; C10M2219/068; C10M2219/08; C10M2219/082; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2010/00; C10N2010/04; C10N2020/00; C10N2020/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
The apparatus in accordance with claim 1 which is a refrigeration apparatus.
Claim 2
Dependent Claim
13 words
The apparatus in accordance with claim 1 which is a heat engine apparatus.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |