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Patent US2812372A successfully refreshed from Google Patents.
US2812372A
Expired / Lapsed
US
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Solvent extraction of naphthalenes
Assignee: Pure Oil Co
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Filing: 1953-07-06
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Granted: 1957-11-05
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Expires: 1973-07-06
Abstract
No abstract record available.
Inventors
- 👤 John W Walsh
- 👤 Le Roi E Hutchings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:40
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/20; C07C15/24; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16; C10G21/20; C10G21/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS FOR SEPARATING A POLYMER MIXTURE PROP DUCED IN A CONVENTIONAL HYDROFORMING PROCESS CONSISTING ESSENTIALLY OF NAPHTHALENE AND ALKYL DERIVATIVES THEREOF AND ALKYL BENZENES INTO AN EXTRACT FRACTION ENRICHED IS THE NAPHTHALENE CONSTITUENTS WHICH COMPRISES SOLVENT EX-NSISTTRACTING THE HYDROCARBON MIXTURE WITH A SOLVENT CONSISTING OF A DIALKYLNITRILE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF B,B''-THIODIPROPIONITRILE, B,B''-OXYDIPROPIONITRILE, B,B''-IMINODIPROPIONITRILE, AND A WATER-CONTAINING MIXTURE THEREOF CONTAINING 1-5 VOL, PERCENT OF WATER, AND RECOVERING A FRACTION OF THE POLYMER MIXTURE EN-RICHED IN THE NAPHTHALENE CONSTITUENTS IN THE EXTRACT PHASE.
Claim 2
Dependent Claim
86 words
A PROCESS FOR SEPARATING A POLYMER MIXTURE PROP DUCED IN A CONVENTIONAL HYDROFORMING PROCESS CONSISTING ESSENTIALLY OF NAPHTHALENE AND ALKYL DERIVATIVES THEREOF AND ALKYL BENZENES INTO AN EXTRACT FRACTION ENRICHED IS THE NAPHTHALENE CONSTITUENTS WHICH COMPRISES SOLVENT EX-NSISTTRACTING THE HYDROCARBON MIXTURE WITH A SOLVENT CONSISTING OF A DIALKYLNITRILE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF B,B''-THIODIPROPIONITRILE, B,B''-OXYDIPROPIONITRILE, B,B''-IMINODIPROPIONITRILE, AND A WATER-CONTAINING MIXTURE THEREOF CONTAINING 1-5 VOL, PERCENT OF WATER, AND RECOVERING A FRACTION OF THE POLYMER MIXTURE EN-RICHED IN THE NAPHTHALENE CONSTITUENTS IN THE EXTRACT PHASE.
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) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |