Patent US4545345A successfully refreshed from Google Patents.
Patent US3210259A successfully refreshed from Google Patents.
US3210259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive separation process
Assignee: Monsanto Co
•
Filing: 1961-06-26
•
Granted: 1965-10-05
•
Expires: 1981-06-26
Abstract
No abstract record available.
Inventors
- 👤 Cornell David
- 👤 James R Fair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:02
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
THE METHOD OF SEPARATING CLASSES OF THE AROMATIC HYDROCARBONS FROM A MIXTURE COMPRISING HYDROCARBONS SELECTED FROM THE CLASS CONSISTING OF UNSUBSTITUTED AROMATIC HYDROCARBONS, PARTIALLY HYDROGENATED AROMATIC HYDROCARBONS, ARALKANES, ARALKENES AND ARALKYNES WHICH COMPRISES CONTACTING THE SAID MIXTURE WITH A PYRROLIDONE SOLVENT HAVING THE FORMULA
Claim 2
Independent Claim
44 words
THE METHOD OF SEPARATING CLASSES OF THE AROMATIC HYDROCARBONS FROM A MIXTURE COMPRISING HYDROCARBONS SELECTED FROM THE CLASS CONSISTING OF UNSUBSTITUTED AROMATIC HYDROCARBONS, PARTIALLY HYDROGENATED AROMATIC HYDROCARBONS, ARALKANES, ARALKENES AND ARALKYNES WHICH COMPRISES CONTACTING THE SAID MIXTURE WITH A PYRROLIDONE SOLVENT HAVING THE FORMULA
References Cited (Backward Citations)
US2737538A
Cited
US2730558A
Cited
US2771494A
Cited
US2849396A
Cited
US2753381A
Cited
US2840511A
Cited
US2943122A
Cited
US3082271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |