US2779713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving lubricating oils by hydro-refining in a first stage and then hydrofinishing under milder conditions
Assignee: Texaco Inc
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Filing: 1955-10-10
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Granted: 1957-01-29
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Expires: 1975-10-10
Abstract
No abstract record available.
Inventors
- 👤 Edward L Cole
- 👤 William E Skelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:42
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/04; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A METHOD OF PROCESSING A HYDROCARBON LUBRICATING OIL STOCK TO ENHANCE THE QUALITY THEREOF WHICH COMPRISES SUBJECTING SAID LUBRICATING OIL STOCK IN ADMIXTURE WITH HYDROGEN AND IN THE PRESENCE OF A HYDROGENATION CATALYST TO CONDITIONS OF MILD HYDROGENATION SUCH THAT SAID LUBRICATING OIL STOCK IS CONVERTED TO AN INTERMEDIATE PRODUCT OF IMPROVED VISCOSITY INDEX, AND SUBJECTING SAID INTER-
Claim 2
Independent Claim
58 words
A METHOD OF PROCESSING A HYDROCARBON LUBRICATING OIL STOCK TO ENHANCE THE QUALITY THEREOF WHICH COMPRISES SUBJECTING SAID LUBRICATING OIL STOCK IN ADMIXTURE WITH HYDROGEN AND IN THE PRESENCE OF A HYDROGENATION CATALYST TO CONDITIONS OF MILD HYDROGENATION SUCH THAT SAID LUBRICATING OIL STOCK IS CONVERTED TO AN INTERMEDIATE PRODUCT OF IMPROVED VISCOSITY INDEX, AND SUBJECTING SAID INTER-
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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |