Patent US3158555A successfully refreshed from Google Patents.
US3158555A
Expired / Lapsed
US
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Extractive separation process
Assignee: Monsanto Co
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Filing: 1961-06-26
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Granted: 1964-11-24
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Expires: 1981-06-26
Abstract
No abstract record available.
Inventors
- 👤 Cornell David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:01
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE METHOD OF SEPARATING CLASSES OF HYDROCARBONS FROM A MIXTURE COMPRISING HYDROCARBONS OF THE CLASSES CONSISTING OF PARAFFINS, MONOOLEFINS, DIOLEFINS, NAPHTHENES, AND AROMATIC HYDROCARBONS WHICH COMPRISES CONTACTING THE SAID MIXTURE WITH A PHOSPHORUS AMIDE HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Independent Claim
39 words
THE METHOD OF SEPARATING CLASSES OF HYDROCARBONS FROM A MIXTURE COMPRISING HYDROCARBONS OF THE CLASSES CONSISTING OF PARAFFINS, MONOOLEFINS, DIOLEFINS, NAPHTHENES, AND AROMATIC HYDROCARBONS WHICH COMPRISES CONTACTING THE SAID MIXTURE WITH A PHOSPHORUS AMIDE HAVING THE FOLLOWING STRUCTURAL FORMULA:
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) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |