Patent US2695271A successfully refreshed from Google Patents.
US2695271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating hydrocarbon base
Assignee: —
•
Filing: —
•
Granted: 1954-11-23
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Expires: 1971-11-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 01:39
CPC Classifications
C; C10; C10M; C10M159/00; C10M159/12; C10M159/123; C10M2223/00; C10M2223/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A METHOD OF PROCESSING HYDROCARBON LUBRICATING OIL STOCK WHICH METHOD COMPRISES TREATING SAID STOCK WITH AN AMOUNT OF PHOSPHORUS PENTASULFIDE IN THE RANGE OF ABOUT 0.1 TO ABOUT 0.75% AT A TEMPERATURE IN THE RANGE OF ABOUT 275* TO ABOUT 450* F. IN THE PRESENCE OF A SMALL AMOUNT WITHIN THE RANGE FROM ABOUT 0.25 TO 2% OF BUTYL RUBBER.
Claim 2
Independent Claim
60 words
A METHOD OF PROCESSING HYDROCARBON LUBRICATING OIL STOCK WHICH METHOD COMPRISES TREATING SAID STOCK WITH AN AMOUNT OF PHOSPHORUS PENTASULFIDE IN THE RANGE OF ABOUT 0.1 TO ABOUT 0.75% AT A TEMPERATURE IN THE RANGE OF ABOUT 275* TO ABOUT 450* F. IN THE PRESENCE OF A SMALL AMOUNT WITHIN THE RANGE FROM ABOUT 0.25 TO 2% OF BUTYL RUBBER.
References Cited (Backward Citations)
US2560546A
Cited
US2460041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-22 | 1958-05-24 | 1958-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-22 | 1962-05-24 | 1962-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-22 | 1966-05-24 | 1966-11-23 | $7700.00 | Window Closed / Lapsed |