Patent US2798027A successfully refreshed from Google Patents.
US2798027A
Expired / Lapsed
US
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Dewaxing process
Assignee: North Atlantic Energies SA
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Filing: 1954-10-11
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Granted: 1957-07-02
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Expires: 1974-10-11
Abstract
No abstract record available.
Inventors
- 👤 Cohen Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:05
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
AN IMPROVED PROCESS FOR DEWAXING MINERAL OILS WHICH COMPRISES ADDING TO A WAX-CONTAINING MINERAL OIL A FRIEDEL-CRAFTS CONDENSATION PRODUCT OF A HALOGENATED PARAFFIN WITH AN AROMATIC HYDROCARBON, AND A POLYMERIZED UNSATURATED ESTER PRIOR TO FILTERING SOLID WAX FROM THE OIL.
Claim 2
Dependent Claim
40 words
AN IMPROVED PROCESS FOR DEWAXING MINERAL OILS WHICH COMPRISES ADDING TO A WAX-CONTAINING MINERAL OIL A FRIEDEL-CRAFTS CONDENSATION PRODUCT OF A HALOGENATED PARAFFIN WITH AN AROMATIC HYDROCARBON, AND A POLYMERIZED UNSATURATED ESTER PRIOR TO FILTERING SOLID WAX FROM THE OIL.
References Cited (Backward Citations)
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US2081519A
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US2196374A
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US2254433A
Cited
US2491683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |