US2848372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for solvent dewaxing of oils
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1954-09-01
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Granted: 1958-08-19
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Expires: 1974-09-01
Abstract
No abstract record available.
Inventors
- 👤 Jr William T Knox
- 👤 Stephen F Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:29
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
IN A SOLVENT DEWAXING PROCESS UTILIZING DEWAXING SOLVENT WHEREIN A MIXTURE OF WAX, OIL, AND SOLVENT IS CHILLED, BY INDIRECT HEAT EXCHANGE, THE IMPROVEMENT OF CARRYING OUT SAID CHILLING WHILE SAID MIXTURE IS IN CONTACT WITH A HEAT TRANSFER COATED WITH PHENOLFROMALDEHYDE POLYMER.
Claim 2
Dependent Claim
43 words
IN A SOLVENT DEWAXING PROCESS UTILIZING DEWAXING SOLVENT WHEREIN A MIXTURE OF WAX, OIL, AND SOLVENT IS CHILLED, BY INDIRECT HEAT EXCHANGE, THE IMPROVEMENT OF CARRYING OUT SAID CHILLING WHILE SAID MIXTURE IS IN CONTACT WITH A HEAT TRANSFER COATED WITH PHENOLFROMALDEHYDE POLYMER.
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) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |