Patent US2746983A successfully refreshed from Google Patents.
US2746983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of commerical paraffin waxes
Assignee: Ruhrchemie AG
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Filing: 1951-01-23
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Granted: 1956-05-22
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Expires: 1971-01-23
Abstract
No abstract record available.
Inventors
- 👤 Luben Robert
- 👤 Stiebling Ewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:02
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/42; Y; Y10; Y10S; Y10S208/00; Y10S208/95
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
METHOD FOR THE PRODUCTION OF COMMERCIAL PARAFFIN WAXES FROM INDUSTRIAL HYDROCARBON MIXTURES WHICH COMPRISES SEPARATING THE FRACTIONS BOILING ABOVE ABOUT 320340* C. FROM SUCH MIXTURES BY DISTILLATION, THEREAFTER CONTACTING THE SAID FRACTIONS WITH HYDROGEN AT A TEMPERATURE OF ABOUT 200-260* C. AND A PRESSURE OF AT LEAST 5 KG./CM.2 IN THE PRESENCE OF AT LEAST ONE OF METAL AND METAL OXIDE CATALYSTS, THEREUPON CONTACTING THE HYDROGENATED FRACTIONS WITH AN EXTRACTION SOLVENT CAPABLE OF DISSOLVING ANY OILY PORTIONS AFTER COOLING, WHILE THE SOLID CONSTITUENTS REMAIN UNDISSOLVED, AND RECOVERING PARAFFIN FRACTIONS OF PREDETERMINED MELTING POINTS.
Claim 2
Dependent Claim
93 words
METHOD FOR THE PRODUCTION OF COMMERCIAL PARAFFIN WAXES FROM INDUSTRIAL HYDROCARBON MIXTURES WHICH COMPRISES SEPARATING THE FRACTIONS BOILING ABOVE ABOUT 320340* C. FROM SUCH MIXTURES BY DISTILLATION, THEREAFTER CONTACTING THE SAID FRACTIONS WITH HYDROGEN AT A TEMPERATURE OF ABOUT 200-260* C. AND A PRESSURE OF AT LEAST 5 KG./CM.2 IN THE PRESENCE OF AT LEAST ONE OF METAL AND METAL OXIDE CATALYSTS, THEREUPON CONTACTING THE HYDROGENATED FRACTIONS WITH AN EXTRACTION SOLVENT CAPABLE OF DISSOLVING ANY OILY PORTIONS AFTER COOLING, WHILE THE SOLID CONSTITUENTS REMAIN UNDISSOLVED, AND RECOVERING PARAFFIN FRACTIONS OF PREDETERMINED MELTING POINTS.
References Cited (Backward Citations)
US1684640A
Cited
US2229658A
Cited
US2351345A
Cited
US2471914A
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US2558557A
Cited
US2564200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |