US2849511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of organic compounds
Assignee: Union Oil Company of California
•
Filing: 1953-05-25
•
Granted: 1958-08-26
•
Expires: 1973-05-25
Abstract
No abstract record available.
Inventors
- 👤 William D Schaeffer
- 👤 Art C Mckinnis
- 👤 Dorsey William Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:27
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR RESOLVING A MIXTURE OF AROMATIC HYDROCARBONS DIFFERING IN MOLECULAR CONFIGURATION BY EXTRACTIVE CRYSTALLIZATION WITH A SOLID WERNER COMPLEX, SAID WERNER COMPLEX CONSISTING OF A METAL SALT COORDINATED WITH 2 TO 6 MOLES OF A HETEROCYCLIC NITROGEN BASE, WHICH COMPRISES DISSOLVING SAID HYDROCARGONS AND SAID WERNER COMPLEX IN A SOLVENT CONSISTING ESSENTIALLY OF A LOWER ALIPHATIC POLY-ALCOHOL CONTAINING NOT MORE THAN THREE HYDROXYL GROUPS, COOLING THE RESULTING SOLUTION TO PRE-
Claim 2
Dependent Claim
72 words
A PROCESS FOR RESOLVING A MIXTURE OF AROMATIC HYDROCARBONS DIFFERING IN MOLECULAR CONFIGURATION BY EXTRACTIVE CRYSTALLIZATION WITH A SOLID WERNER COMPLEX, SAID WERNER COMPLEX CONSISTING OF A METAL SALT COORDINATED WITH 2 TO 6 MOLES OF A HETEROCYCLIC NITROGEN BASE, WHICH COMPRISES DISSOLVING SAID HYDROCARGONS AND SAID WERNER COMPLEX IN A SOLVENT CONSISTING ESSENTIALLY OF A LOWER ALIPHATIC POLY-ALCOHOL CONTAINING NOT MORE THAN THREE HYDROXYL GROUPS, COOLING THE RESULTING SOLUTION TO PRE-
References Cited (Backward Citations)
US2627513A
Cited
US2642422A
Cited
US2642424A
Cited
US2653122A
Cited
US2663671A
Cited
US2511711A
Cited
US2588506A
Cited
US2596344A
Cited
US2585491A
Cited
US2658887A
Cited
US2642379A
Cited
US2656301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |