Patent US4275253A successfully refreshed from Google Patents.
US4275253A
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US
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Radiation resistant oil and method of lubricating for atomic power facilities
Assignee: Kureha Corp
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Filing: 1978-10-10
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Granted: 1981-06-23
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Expires: 1998-10-10
Abstract
Abstract A radiation resistant working oil for lubricating parts of atomic power facilities which are exposed to radioactive rays consists essentially of alpha-benzyl substituted methylnaphthalene isomers and beta-benzyl substituted methylnaphthalene isomers in the ratio of about 1:0.2-1:1.
Inventors
- 👤 Masaaki Takahashi
- 👤 Akira Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:16
CPC Classifications
C; C10; C10M; C10M3/00; C10M2203/00; C10M2203/02; C10M2203/022; C10M2203/024; C10M2203/04; C10M2203/06; C10M2207/00; C10M2207/04; C10M2209/00; C10M2209/02; C10M2209/10; C10M2209/101; C10N; C10N2030/00; C10N2030/32; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/944
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A radiation resistant working oil suitable for use as a lubricant or medium for parts of atomic power facilities and nuclear reactors which are exposed to strong radiation, consisting essentially of a mixture of alpha-benzyl substituted methylnaphthalene isomers and beta-benzyl substituted methylnaphthalene isomers at a weight ratio of said alpha-benzyl methylnaphthalene isomers to said beta-benzyl methylnaphthalene isomers of from 50:50 to 95:5, said mixture being prepared by condensing alpha- and beta-methylnaphthalenes with benzyl chloride in the presence of Friedel Crafts' catalyst.
Claim 2
Dependent Claim
81 words
A radiation resistant working oil suitable for use as a lubricant or medium for parts of atomic power facilities and nuclear reactors which are exposed to strong radiation, consisting essentially of a mixture of alpha-benzyl substituted methylnaphthalene isomers and beta-benzyl substituted methylnaphthalene isomers at a weight ratio of said alpha-benzyl methylnaphthalene isomers to said beta-benzyl methylnaphthalene isomers of from 50:50 to 95:5, said mixture being prepared by condensing alpha- and beta-methylnaphthalenes with benzyl chloride in the presence of Friedel Crafts' catalyst.
Claim 3
Independent Claim
79 words
A method of lubricating parts of atomic power facilities and nuclear reactors which are exposed to strong radiation comprising applying to said parts a substance consisting essentially of a mixture of alpha-benzyl substituted methylnaphthalene isomers and beta-benzyl substituted methylnaphthalene isomers at a weight ratio of said alpha-benzyl substituted methylnaphthalene isomers to beta-benzyl substituted methylnaphthalene isomers of from 50:50 to 95:5, said mixture being prepared by condensing alpha- and beta-methylnaphthalenes with benzyl chloride in the presence of Friedel Crafts' catalyst.
Claim 4
Independent Claim
79 words
A method of lubricating parts of atomic power facilities and nuclear reactors which are exposed to strong radiation comprising applying to said parts a substance consisting essentially of a mixture of alpha-benzyl substituted methylnaphthalene isomers and beta-benzyl substituted methylnaphthalene isomers at a weight ratio of said alpha-benzyl substituted methylnaphthalene isomers to beta-benzyl substituted methylnaphthalene isomers of from 50:50 to 95:5, said mixture being prepared by condensing alpha- and beta-methylnaphthalenes with benzyl chloride in the presence of Friedel Crafts' catalyst.
Claim 5
Dependent Claim
25 words
The method of claim 2 wherein said parts of atomic power facilities and nuclear reactors are hydraulic actuators, hydraulic shock absorbers or anti-earthquake vibration insulators.
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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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |