US3133889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membrane manufacture
Assignee: —
•
Filing: —
•
Granted: 1964-05-19
•
Expires: 1981-05-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:50
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS FOR THE PRODUCTION OF ION EXCHANGE MEMBRANES WHICH COMPRISES CONTACTING A VINYL AROMATIC MONOMER WITH A SOLID CARRIER POLYMER UNTIL THE MONOMER IS BSORBED THEREIN, POLYMERIZING SAID MONOMER WITHIN SAID POLYMER BY THERMAL TREATMENT ABOVE ROOM TEMPERATURE AND BELOW THE SOFTENING TEMPERATURE OF THE CARRIER POLYMER IN THE PRESENCE OF A REE RADICAL PRODUCING POLYMERIZATION CATALYST AND THEREAFTERR INTRODUCING ION EXCHANGE GROUPS INTO THE POLYMERIZED MONOMER.
Claim 2
Dependent Claim
68 words
THE PROCESS FOR THE PRODUCTION OF ION EXCHANGE MEMBRANES WHICH COMPRISES CONTACTING A VINYL AROMATIC MONOMER WITH A SOLID CARRIER POLYMER UNTIL THE MONOMER IS BSORBED THEREIN, POLYMERIZING SAID MONOMER WITHIN SAID POLYMER BY THERMAL TREATMENT ABOVE ROOM TEMPERATURE AND BELOW THE SOFTENING TEMPERATURE OF THE CARRIER POLYMER IN THE PRESENCE OF A REE RADICAL PRODUCING POLYMERIZATION CATALYST AND THEREAFTERR INTRODUCING ION EXCHANGE GROUPS INTO THE POLYMERIZED MONOMER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |