ATE429971T1
Polyimide blends for gas separation membranes
Abstract
The present invention provides a selectively gas permeable membrane that has a superior combination of permeability and selectivity. The membrane composition includes a Type 1 copolyimide uniformly blended with a Type 2 copolyimide, which polymers are defined by chemical structure more specifically in this disclosure. The invention also provides a method of using the membrane of the copolyimide blend to separate components of gas mixtures.
Term
Term ended
Projected expiry passed 27 October 2023, 2.9 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
3 priority claims, no other members on record
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 43027502 | United States of America | P | |
| 64240703 | United States of America | A | |
| 0304769 | International Bureau of the World Intellectual Property Organization (WIPO) | W |
1 legal event, as the office reported them to INPADOC
Events
| Event | Code | |
|---|---|---|
| Ceased as to paragraph 5 lit. 3 law introducing patent treatiesCeasedRER | RER |
Numbers
- Application
- 3769717
Titles2
- German
- MISCHUNGEN AUS POLYIMID FÜR MEMBRANEN ZUR GASTRENNUNG
- English
- POLYIMIDE MIXTURES FOR GAS SEPARATION MEMBRANES
Classification
- CPC, 5
- B01D71/64
- B01D53/228
- C08L79/08
- C08L2205/02
- Y02C20/40
- IPC, 3
- B01D53 22
- B01D71 64
- C08L79 08