EP0447971A3
Gas separation material
Abstract
A novel class of polyimides useful in making semi-permeable membranes for gas separation is synthesized by the reaction of 4,4-[hexafluoroisopropylidene]-bis-[phthalic anhydride] (6FDA) with 3,7-diamino-2,8-dimethyldiphenylenesulfone (AMPS). In lieu of the two methyl groups the diamine may be substituted by H or C₂₋₄ alkyl. Membranes made from the polyimides have high permeability for CO₂ from mixtures containing CO₂ and other gases such as CH₄ and have commercially acceptable selectivity.
Term
Term ended
Projected expiry passed 15 March 2011, 15.5 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
Every citation, both ways
| Document | Relation | Office | Category | Cited during |
|---|---|---|---|---|
| EP0265898A2 | Cites | European Patent Office (EPO) | YD | Search report |
| EP0385240A1 | Cites | European Patent Office (EPO) | YP | Search report |
| US4690873A | Cites | United States of America | YD | Search report |
| JOURNAL OF MEMBRANE SCIENCE, vol. 37, (1988), pages 45-62, ELSEVIER SCIENCE PUBLISHERS B.V., Amsterdam, T.H. KIM et al. "Relationship Between Gas Separation Pro- perties and Chemical Structure in a Series of Aromatic Polyimides" | Non-patent | – | – | Search report |
9 members in 6 offices
Priority claims4
| Document | Office | Kind | Date |
|---|---|---|---|
| 497045 | United States of America | – | |
| 49704590 | United States of America | A | |
| 49704590 | United States of America | A | |
| US19900497045 | – | – | – |
Members9
| Document | Office | Kind | |
|---|---|---|---|
| NO911068D0 | Norway | D0 | |
| US5042992A | United States of America | A | |
| CA2037095A1 | Canada | A1 | |
| NO911068L | Norway | L | |
| EP0447971A2 | European Patent Office (EPO) | A2 | |
| AU7361391A | Australia | A | |
| JPH04222832A | Japan | A | |
| AU628774B2 | Australia | B2 | |
| EP0447971A3This record | European Patent Office (EPO) | A3 |
8 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Application deemed to be withdrawnWithdrawn18D | 18D | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWNSTAA | STAA | |
| First examination report despatched17Q | 17Q | |
| Request for examination filed17P | 17P | |
| Designated contracting statesAK | AK | |
| Search report despatchedORIGINAL CODE: 0009013PUAL | PUAL | |
| Designated contracting statesAK | AK | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI | PUAI |
Numbers
- Publication
- 0447971
- Publication, DOCDB
- 0447971
- Publication, EPODOC
- EP0447971
- Application
- 103987
- Application, DOCDB
- 91103987
- Application, EPODOC
- EP19910103987
Titles3
- German
- Material zur Gastrennung
- English
- Gas separation material
- French
- Matériau pour séparer des gaz
Classification
- CPC, 3
- C08G73/1085
- B01D71/64
- Y02C20/40
- IPC, 4
- B01D71 64
- B01D71 70
- C08G73 06
- C08G73 10
Designated states1
- Contracting states, 1
- Sweden