US2655467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating predomi
Assignee: —
•
Filing: —
•
Granted: 1953-10-13
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Expires: 1970-10-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:52
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/14; B01D3/00; B01D3/34; C; C07; C07C; C07C15/00; C07C15/02; C07C15/04; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C10; C10G; C10G2400/00; C10G2400/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A PROCESS OF SEPARATING PREDOMINANTLY AROMATIC HYDROCARBONS FROM PREDOMINANTLY SATURATED HYDROCARBONS OF SIMILAR BOILING POINTS WHICH COMPRISES SUBJECTING A MIXTURE OF HYDROCARBONS HAVING AT LEAST HALF THEIR MOLECULAR WEIGHT IN BENZENOID RINGS AND HYDROCARBONS OF SIMILAR BOILING POINT HAVING LESS THAN ONE DOUBLE BOND PER SIX CARBON ATOMS, THE MIXTURE HAVING A BOILING POINT BELOW THAT OF PHTHALIC ANHYDRIDE TO DISTILLATION UNDER PARTIAL REFLUX COUNTER-CURRENT TO A STREAM OF MOLTEN PHTHALIC ANHYDRIDE WHEREBY THE VAPOR PRESSURE OF THE PREDOMINATLY AROMATIC CONSTITUENTS OF THE MIXTURE IS DECREASED AND THE VAPOR PRESSURE OF THE PREDOMINANTLY SATURATED COMPONENT IS INCREASED, THE PREDOMINANTLY SATURATED HYDROCARBONS BEING OBTAINED AS AN OVERHEAD AND A SOLUTION OF PHTHALIC ANHYDRIDE AND THE PREDOMINANTLY AROMATIC HYDROCARBONS BEING OBTAINED FROM THE STILL IN LIQUID FORM.
Claim 2
Dependent Claim
125 words
A PROCESS OF SEPARATING PREDOMINANTLY AROMATIC HYDROCARBONS FROM PREDOMINANTLY SATURATED HYDROCARBONS OF SIMILAR BOILING POINTS WHICH COMPRISES SUBJECTING A MIXTURE OF HYDROCARBONS HAVING AT LEAST HALF THEIR MOLECULAR WEIGHT IN BENZENOID RINGS AND HYDROCARBONS OF SIMILAR BOILING POINT HAVING LESS THAN ONE DOUBLE BOND PER SIX CARBON ATOMS, THE MIXTURE HAVING A BOILING POINT BELOW THAT OF PHTHALIC ANHYDRIDE TO DISTILLATION UNDER PARTIAL REFLUX COUNTER-CURRENT TO A STREAM OF MOLTEN PHTHALIC ANHYDRIDE WHEREBY THE VAPOR PRESSURE OF THE PREDOMINATLY AROMATIC CONSTITUENTS OF THE MIXTURE IS DECREASED AND THE VAPOR PRESSURE OF THE PREDOMINANTLY SATURATED COMPONENT IS INCREASED, THE PREDOMINANTLY SATURATED HYDROCARBONS BEING OBTAINED AS AN OVERHEAD AND A SOLUTION OF PHTHALIC ANHYDRIDE AND THE PREDOMINANTLY AROMATIC HYDROCARBONS BEING OBTAINED FROM THE STILL IN LIQUID FORM.
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) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |