US3262873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter aid for dewaxing mineral oils
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1960-12-06
•
Granted: 1966-07-26
•
Expires: 1980-12-06
Abstract
No abstract record available.
Inventors
- 👤 John L Tiedje
- 👤 Ilnyckyj Stephan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:27
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/04; B; B01; B01J; B01J20/00; B01J20/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN THE PROCESS OF SOLVENT DEWAXING WHEREIN A LUBE OIL FRACTION IS SOLVENT DEWAXED BY DILUTING WITH A MIXTURE OF 50% MEK AND 50% MIBK AND CHILLING AT A RATE OF 6*F./MINUTE TO A FILTERING TEMPERATURE OF 0*F. WHEREIN 0.05 WT PERCENT OF ETHYLENE-VINYL ACETATE COPOLYMER COMPRISING 26.4 WT, PERCENT OF VINYL ACETATE AND 73.6 WT PERCENT OF ETHYLENE BASED ON THE WT. OF COPOLYMER, HAVING A MOLECULAR WEIGHT OF 1,530 IS ADDED PIOR TO FILTRATION, PRECIPITATING THE WAX PRESENT IN SAID OIL AND FILTERING THE PRECIPITATED WAX.
Claim 2
Dependent Claim
88 words
IN THE PROCESS OF SOLVENT DEWAXING WHEREIN A LUBE OIL FRACTION IS SOLVENT DEWAXED BY DILUTING WITH A MIXTURE OF 50% MEK AND 50% MIBK AND CHILLING AT A RATE OF 6*F./MINUTE TO A FILTERING TEMPERATURE OF 0*F. WHEREIN 0.05 WT PERCENT OF ETHYLENE-VINYL ACETATE COPOLYMER COMPRISING 26.4 WT, PERCENT OF VINYL ACETATE AND 73.6 WT PERCENT OF ETHYLENE BASED ON THE WT. OF COPOLYMER, HAVING A MOLECULAR WEIGHT OF 1,530 IS ADDED PIOR TO FILTRATION, PRECIPITATING THE WAX PRESENT IN SAID OIL AND FILTERING THE PRECIPITATED WAX.
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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) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |