US2603589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating hydrocarbon waxes
Assignee: Shell Development Co
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Filing: 1950-03-31
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Granted: 1952-07-15
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Expires: 1970-03-31
Abstract
No abstract record available.
Inventors
- 👤 August A Schaerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:37
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
145 words
A PROCESS FOR THE SEPARATION OF STRAIGHTCHAIN PARAFFIN WAXES FROM A PARAFFINIC WAXY MIXTURE OF STRAIGHT-CHAIN PARAFFIN WAXES AND NONSTRAIGHT-CHAIN PARAFFIN WAXES AT LEAST SOME OF WHICH STRAIGHT-CHAIN PARAFFIN WAXES HAVE MELTING POINTS BELOW THE MELTING POINTS OF AT LEAST SOME OF SAID NON-STRAIGHT CHAIN PARAFFIN WAXES PRESENT THEREIN, WHICH PROCESS COMPRISES: SEPARATING FROM SAID WAXY MIXTURE BY DISTILLATION A PLURALITY OF DISTILATE FRACTIONS EACH OF WHICH HAS A BOILING POINT RANGE OF NOT MORE THAN ABOUT 40* C., CONTAINS BOTH STRAIGHT-CHAIN PARAFFIN WAXES AND NON-STRAIGHT-CHAIN PARAFFIN WAXES, AND THE NUMBER OF CARBON ATOMS PER MOLECULE OF ALL OF THE PARAFFIN WAXES PRESENT THEREIN DIFFERS BY NO MORE THAN FOUR CARBON ATOMS, WHEREBY THE MELTING POINT OF THE LOWEST MELTING STRAIGHTCHAIN PARAFFIN WAX PRESENT IN A GIVEN ONE OF SAID FRACTIONS IS HIGHER THAN THE MELTING POINT OF THE HIGHEST MELTING NON-STRAIGHT CHAIN PARAFFIN WAX
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) | 1955-07-15 | 1956-01-14 | 1956-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-15 | 1960-01-14 | 1960-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-15 | 1964-01-14 | 1964-07-15 | $7700.00 | Window Closed / Lapsed |