US3299157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeable membrane and method of making same for use in a paraxylene separation
Assignee: Amicon Corp
•
Filing: 1961-03-07
•
Granted: 1967-01-17
•
Expires: 1981-03-07
Abstract
No abstract record available.
Inventors
- 👤 Raymond F Baddour
- 👤 Alan S Michaels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:24
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/144
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
THE METHOD OF MAKING A DIFFUSION MEMBRANE WHICH HAS A SELECTIVE PERMEABILITY FOR PARAXYLENE OF A MIXTURE OF ORTHO-, META-, AND PARAXYLENE WHICH COMPRISES SELECTING PARAXYLENE, PROVIDING A MEMBRANE OF LOW DENSITY POLYETHYLENE IN WHICH SAID PARAXYLENE IS SOLUBLE TO THE EXTENT OF 1% TO 30% BY WEIGHT AT A SELECTED TEMPERATURE MORE THAN 10*C. BELOW THE TEMPERATURE AT WHICH DISSOLUTION OF SAID MEMBRANE IN SAID PARAXYLENE OCCURS, MAINTAINING SAID MEMBRANE IN CONTACT WITH A MASS OF SAID PARAXYLENE AT A TEMPERATURE BELOW SAID DISSOLUTION TEMPERATURE AND AT LEAST 5*C. ABOVE SAID SELECTED TEMPERATURE TO CAUSE SAID MEMBRANE TO ABSORB SAID PARAXYLENE AND COOLING SAID MEMBRANE TO SAID SELECTED TEMPERATURE.
Claim 2
Independent Claim
110 words
THE METHOD OF MAKING A DIFFUSION MEMBRANE WHICH HAS A SELECTIVE PERMEABILITY FOR PARAXYLENE OF A MIXTURE OF ORTHO-, META-, AND PARAXYLENE WHICH COMPRISES SELECTING PARAXYLENE, PROVIDING A MEMBRANE OF LOW DENSITY POLYETHYLENE IN WHICH SAID PARAXYLENE IS SOLUBLE TO THE EXTENT OF 1% TO 30% BY WEIGHT AT A SELECTED TEMPERATURE MORE THAN 10*C. BELOW THE TEMPERATURE AT WHICH DISSOLUTION OF SAID MEMBRANE IN SAID PARAXYLENE OCCURS, MAINTAINING SAID MEMBRANE IN CONTACT WITH A MASS OF SAID PARAXYLENE AT A TEMPERATURE BELOW SAID DISSOLUTION TEMPERATURE AND AT LEAST 5*C. ABOVE SAID SELECTED TEMPERATURE TO CAUSE SAID MEMBRANE TO ABSORB SAID PARAXYLENE AND COOLING SAID MEMBRANE TO SAID SELECTED TEMPERATURE.
Claim 3
Dependent Claim
55 words
THE METHOD OF SEPARATING PARAXYLENE FROM A MIXTURE OF FLUID MATERIALS WHICH COMPRISES PREPARING A DIFFUSION MEMBRANE AS CLAIMED IN CLAIM 1, THEREAFTER PLACING ONE SIDE OF SAID MEMBRANE IN CONTACT WITH A SUPPLY OF SAID MIXTURE, AND REDUCING THE PRESSURE AT THE OPPOSITE SIDE OF SAID MEMBRANE TO CAUSE SAID PARAXYLENE TO DIFFUSE THERETHROUGH.
References Cited (Backward Citations)
US2159434A
Cited
US2947687A
Cited
US3043891A
Cited
US2984623A
Cited
US3035060A
Cited
US2960412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |