US2795535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact filtration of lubricating oils
Assignee: Pure Oil Co
•
Filing: 1952-12-30
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Granted: 1957-06-11
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Expires: 1972-12-30
Abstract
No abstract record available.
Inventors
- 👤 Gifford W Crosby
- 👤 Le Roy W Holm
- 👤 Robert W Morrison
- 👤 Walter J Sandner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:40
CPC Classifications
C; C10; C10G; C10G25/00; C10G71/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A PROCESS FOR REDUCING THE NEUTRALIZATION VALUE OF A LUBRICATING OIL THE STEP WHICH COMPRISES INTIMATELY CONTACTING AT A TEMPERATURE OF ABOUT 350*-550*F. AN ORGANIC ACID-CONTAINING LUBRICATING OIL WITH 3-15 POUNDS PER BARREL OF OIL OF A HYDROUS ALUMINO-SILICATE ADSORBENT FROM WHICH SUBSTANTIALLY ALL OF THE BOUND WATER IS REMOVED WITHOUT DELETERIOUSLY EFFECTING THE STRUCTURAL WATER CONTENT OF SAID ADSORBENT FOR A TIME SUFFICIENT TO PRODUCE A SUBSTANTIAL IMPROVEMENT IN THE NEUTRALIZATION VALUE REDUCTION OF SAID OIL, CONTACTING BEING CONDUCTED IN THE ABSENCE OF AIR AND STEAM, AND MAINTAINED IN AN ANHYDROUS CONDITION BY STRIPPING DURING SAID CONTACTING ANY MOISTURE WHICH IS PRODUCED DURING SAID CONTACTING.
Claim 2
Dependent Claim
107 words
IN A PROCESS FOR REDUCING THE NEUTRALIZATION VALUE OF A LUBRICATING OIL THE STEP WHICH COMPRISES INTIMATELY CONTACTING AT A TEMPERATURE OF ABOUT 350*-550*F. AN ORGANIC ACID-CONTAINING LUBRICATING OIL WITH 3-15 POUNDS PER BARREL OF OIL OF A HYDROUS ALUMINO-SILICATE ADSORBENT FROM WHICH SUBSTANTIALLY ALL OF THE BOUND WATER IS REMOVED WITHOUT DELETERIOUSLY EFFECTING THE STRUCTURAL WATER CONTENT OF SAID ADSORBENT FOR A TIME SUFFICIENT TO PRODUCE A SUBSTANTIAL IMPROVEMENT IN THE NEUTRALIZATION VALUE REDUCTION OF SAID OIL, CONTACTING BEING CONDUCTED IN THE ABSENCE OF AIR AND STEAM, AND MAINTAINED IN AN ANHYDROUS CONDITION BY STRIPPING DURING SAID CONTACTING ANY MOISTURE WHICH IS PRODUCED DURING SAID CONTACTING.
References Cited (Backward Citations)
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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) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |