Patent US2742409A successfully refreshed from Google Patents.
US2742409A
Expired / Lapsed
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Revivification of spent contact clay with n-dialiphatic formamide
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1952-05-31
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Granted: 1956-04-17
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Expires: 1972-05-31
Abstract
No abstract record available.
Inventors
- 👤 Oliver H P Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:01
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/12; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/12; B01J20/30; B01J20/34; B01J20/3433; B01J20/345; B01J20/3458; B01J20/3466; B01J20/3475
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A METHOD FOR TREATING CONTACT CLAY WHICH HAS BECOME SPENT IN TREATING A LUBRICATING OLI FRACTION AND WHICH CONTAINS COLOR BODIES ADSORBED FROM THE LUBRICATING OIL WHICH COMPRISES TREATING SAID SPENT CLAY WITH A SUFFICIENT AMOUNT OF A NI-DIALIPHATIC FORMAMIDE BOILING BELOW ABOUT 500* F. TO REMOVE COLOR BODIES FROM SAID SPENT CLAY AND THEN RECOVERING SAID TREATED CLAY SUBSTANTIALLY FREE OF COLOR BODIES.
Claim 2
Independent Claim
64 words
A METHOD FOR TREATING CONTACT CLAY WHICH HAS BECOME SPENT IN TREATING A LUBRICATING OLI FRACTION AND WHICH CONTAINS COLOR BODIES ADSORBED FROM THE LUBRICATING OIL WHICH COMPRISES TREATING SAID SPENT CLAY WITH A SUFFICIENT AMOUNT OF A NI-DIALIPHATIC FORMAMIDE BOILING BELOW ABOUT 500* F. TO REMOVE COLOR BODIES FROM SAID SPENT CLAY AND THEN RECOVERING SAID TREATED CLAY SUBSTANTIALLY FREE OF COLOR BODIES.
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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |