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The patent EP2588217 was granted to Evonik Fibres on Feb 22, 2017. The application was filed on May 26, 2011 under application number EP11722404A. The patent is currently recorded with a legal status of "Revoked".
A device and method for separating gas mixtures into two fractions each of increased purity. The method involves concatenating multiple gas separation membrane modules in a specific order to improve purity and yield compared to single or two-stage interconnections. The concatenated modules have features like recirculation, compression, and internally stepped configurations. This allows higher methane purities in the permeate stream and better retentate yield compared to traditional interconnections.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative | Opposition Status |
|---|---|---|---|
| HAFFMANS | Nov 22, 2017 | VIERING | ADMISSIBLE |
| AIR PRODUCTS AND CHEMICALS | Nov 21, 2017 | BECK GREENER | ADMISSIBLE |
| L AIR LIQUIDE SOCIETE ANONYME POUR L ETUDE ET L EXPLOITATION DES PROCEDES GEORGES CLAUDE | Oct 19, 2017 | AIR LIQUIDE | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | AT20090001164 |
| DESCRIPTION | EP0596268 |
| DESCRIPTION | EP0603798 |
| DESCRIPTION | EP0695574 |
| DESCRIPTION | EP0799634 |
| DESCRIPTION | EP1634946 |
| DESCRIPTION | US5753011 |
| DESCRIPTION | US6168649 |
| DESCRIPTION | US6565626 |
| DESCRIPTION | WO2011009919 |
| INTERNATIONAL-SEARCH-REPORT | US2006196355 |
| INTERNATIONAL-SEARCH-REPORT | US5919285 |
| INTERNATIONAL-SEARCH-REPORT | US6168649 |
| INTERNATIONAL-SEARCH-REPORT | US6565626 |
| INTERNATIONAL-SEARCH-REPORT | WO0006293 |
| INTERNATIONAL-SEARCH-REPORT | WO2011009919 |
| OPPOSITION | US2007125537 |
| OPPOSITION | US2007272079 |
| OPPOSITION | US2009044701 |
| OPPOSITION | US6572678 |
| OTHER | US5591250 |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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Feb 1, 2013
Priority search results copy provided by EPO
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Letter accompanying subsequently filed items
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Request for entry into the European phase
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Notification of the recording of a change
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Information on entry into European phase
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Notification of the recording of a change
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Copy of the international search report
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Copy of the international search report
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Jan 5, 2012
Published international application - A1
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Sep 19, 2011
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(Electronic) Receipt
PCTRO
May 26, 2011
Abstract
PCTRO
May 26, 2011
Claims
PCTRO
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Description
PCTRO
May 26, 2011
Drawings
PCTRO
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