The patent EP2686026 was granted to Schaefer Kalk on Mar 13, 2019. The application was originally filed on Mar 16, 2012 under application number EP12709292A. The patent is currently recorded with a legal status of "Granted And Under Opposition".

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.
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number | 
|---|---|
| DESCRIPTION | DE4244254 | 
| DESCRIPTION | EP0523372 | 
| DESCRIPTION | EP0922488 | 
| DESCRIPTION | EP2163569 | 
| DESCRIPTION | JPH04139020 | 
| DESCRIPTION | JPH09239020 | 
| DESCRIPTION | JPS6283029 | 
| DESCRIPTION | US2003124242 | 
| DESCRIPTION | US4915884 | 
| DESCRIPTION | US5011862 | 
| DESCRIPTION | US6403219 | 
| DESCRIPTION | WO2008122358 | 
| INTERNATIONAL-SEARCH-REPORT | EP2163569 | 
| INTERNATIONAL-SEARCH-REPORT | US2003124242 | 
| INTERNATIONAL-SEARCH-REPORT | US4915884 | 
| INTERNATIONAL-SEARCH-REPORT | US5011862 | 
| INTERNATIONAL-SEARCH-REPORT | US6403219 | 
| OPPOSITION | DE4244254 | 
| OPPOSITION | EP0224659 | 
| OPPOSITION | EP0523372 | 
| OPPOSITION | EP0922488 | 
| OPPOSITION | US2005177245 | 
| OPPOSITION | US2010310857 | 
| OPPOSITION | US5122418 | 
| OPPOSITION | US5508378 | 
| OPPOSITION | US5756210 | 
| OPPOSITION | WO2007141260 | 
| OPPOSITION | WO2009074491 | 
| OPPOSITION | WO9732920 | 
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Mar 25, 2019
Feb 14, 2019
Decision to grant a European patent
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Jan 30, 2019
Filing of the translations of the claims
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Jan 29, 2019
Filing of the translations of the claims
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Jan 25, 2019
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Intention to grant (signatures)
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Jan 25, 2019
Text intended for grant (clean copy)
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Jan 25, 2019
Jan 2, 2019
Claims
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Jan 2, 2019
English translation of the claims
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Jan 2, 2019
French translation of claims
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Jan 2, 2019
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Translation of the claims
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Jan 2, 2019
Translation of the claims
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Oct 24, 2018
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Oct 24, 2018
Intention to grant (signatures)
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Oct 24, 2018
Text intended for grant (clean copy)
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Oct 24, 2018
Oct 9, 2018
Sep 14, 2018
Claims
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Sep 14, 2018
Claims
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Sep 14, 2018
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Sep 14, 2018
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Sep 14, 2018
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Sep 14, 2018
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Sep 14, 2018
Letter accompanying subsequently filed items
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Sep 14, 2018
Letter dealing with oral proceedings
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Sep 14, 2018
Letter dealing with oral proceedings
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Sep 14, 2018
Non-scannable object
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Sep 12, 2018
Claims
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Sep 12, 2018
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Sep 12, 2018
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Sep 12, 2018
Cover sheet for fax transmission
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Sep 12, 2018
Letter dealing with oral proceedings
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Sep 12, 2018
Letter dealing with oral proceedings
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Sep 12, 2018
Non-scannable object
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Aug 17, 2018
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Aug 17, 2018
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Aug 17, 2018
Letter dealing with oral proceedings
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Aug 17, 2018
Non-scannable object
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Aug 17, 2018
Non-scannable object
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Aug 16, 2018
Advice of delivery
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Aug 2, 2018
Advice of delivery
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Aug 1, 2018
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Summons to attend oral proceedings
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Jul 26, 2018
Advice of delivery
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Jul 25, 2018
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Acknowledgement of a document
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Jul 18, 2018
Advice of delivery
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Jul 18, 2018
Annex
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Jul 18, 2018
Letter dealing with oral proceedings
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Jul 17, 2018
Annex
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Jul 17, 2018
Letter dealing with oral proceedings
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Jul 12, 2018
Acknowledgement of a document
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Jul 12, 2018
Summons to attend oral proceedings
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Jun 25, 2018
Letter dealing with oral proceedings
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Jun 25, 2018
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Advice of delivery
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Jun 21, 2018
Advice of delivery
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Letter dealing with oral proceedings
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Jun 15, 2018
Acknowledgement of a document
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Jun 15, 2018
Annex to the communication
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Jun 15, 2018
Preparation for oral proceedings
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Jun 15, 2018
Summons to attend oral proceedings
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Dec 14, 2017
Annex
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Dec 14, 2017
Nov 24, 2017
Nov 9, 2017
Annex to the communication
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Nov 9, 2017
Communication from the Examining Division
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Apr 4, 2017
Submission concerning representation
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Apr 3, 2017
Submission concerning representation
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Mar 22, 2017
Claims
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Mar 22, 2017
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Mar 22, 2017
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Claims
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Mar 17, 2017
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Payment of fees and costs
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Feb 7, 2017
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Feb 1, 2017
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Annex to the communication
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May 12, 2016
Communication from the Examining Division
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Apr 27, 2016
Examination started
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Jan 22, 2016
Payment of fees and costs
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Jan 22, 2015
Payment of fees and costs
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May 6, 2014
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Reply to Written Opinion prepared by the EPO
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Apr 30, 2014
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Reply to Written Opinion prepared by the EPO
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Jan 20, 2014
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Oct 25, 2013
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Communication to designated inventor
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Oct 23, 2013
Communication to designated inventor
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Oct 18, 2013
Priority search results copy provided by EPO
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Oct 9, 2013
Sep 17, 2013
Submission concerning representation
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Sep 7, 2013
Request for entry into the European phase
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Jul 31, 2013
Information on entry into European phase
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Nov 22, 2012
Copy of the international search report
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Nov 22, 2012
Copy of the international search report
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Nov 22, 2012
Oct 15, 2012
Sep 27, 2012
Published international application - A2
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Sep 27, 2012
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May 22, 2012
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Mar 17, 2012
Abstract
PCTRO
Mar 17, 2012
Annex
PCTRO
Mar 17, 2012
Claims
PCTRO
Mar 17, 2012
Description
PCTRO
Mar 17, 2012
Drawings
PCTRO
Mar 16, 2012