Patent US3834166A successfully refreshed from Google Patents.
US3834166A
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Thermally stable lubricants for external combustion engines
Assignee: Union Carbide Corp
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Filing: 1973-04-13
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Granted: 1974-09-10
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Expires: 1993-04-13
Abstract
Abstract Alkylated aromatic hydrocarbons have been found to serve as lubricants, exhibiting excellent thermal stability, for Rankine Cycle Engines especially when using aqueous nitrogen-containing hydrocarbon motive fluids.
Inventors
- 👤 R Cupper
- 👤 G Somekh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:56
CPC Classifications
C; C10; C10M; C10M3/00; F; F01; F01K; F01K25/00; F01K25/06; C10M2203/00; C10M2203/06; C10M2205/00; C10M2205/02; C10M2205/22; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/28; C10M2207/287; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/22; C10M2215/221; C10M2215/223; C10M2215/224; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/28; C10M2215/30; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
11 words
Method claimed in claim 1 wherein the aromatic hydrocarbon is naphthalene.
Claim 2
Dependent Claim
11 words
Method claimed in claim 1 wherein the aromatic hydrocarbon is anthracene.
Claim 3
Dependent Claim
11 words
Method claimed in claim 1 wherein the aromatic hydrocarbon is phenanthrene.
Claim 4
Dependent Claim
21 words
Method claimed in claim 1 wherein the alkylated aromatic hydrocarbon has a refractive index of about 1.500 to 1.575 at 20*C.
Claim 5
Dependent Claim
20 words
Method claimed in claim 1 wherein the alkylated aromatic hydrocarbon has a density of about 0.88 to 0.96 at 25*C.
Claim 6
Dependent Claim
58 words
Method claimed in claim 1 wherein the lubricant is the reaction product obtained by alkylating naphthalene with isobutylene under Friedel-Crafts conditions having an index of refraction at 20*C. of about 1.562, a density at 25*C. of about 0.944 g./ml., a viscosity at 100*F. (-18*C.) of about 50.0 centistokes and a viscosity at 210*F. (98*C.) of about 4.2 centistokes.
Claim 7
Dependent Claim
25 words
Method claimed in claim 1 wherein the aqueous nitrogen-containing hydrocarbon is aqueous pyridine containing from about 25 to about 90 percent by weight of pyridine.
References Cited (Backward Citations)
US3173965A
Cited
US3183190A
Cited
US3288716A
Cited
US3511049A
Cited
US3538178A
Cited
US3584457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |