Expired European patentEurope
The use of beta-sulfonylacrylic acid derivatives on a dry blend containing them or pellets made therefrom in synthetic polymers
EP 0055474 B1 · Applicant: STAUFFER CHEMICAL COMPANY
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 23, 1981 and granted April 30, 1986. A European patent lasts at most 20 years from filing, so its term ended December 23, 2001.
- A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by June 23, 2007.
- We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledDecember 23, 1981
PublishedJuly 7, 1982
GrantedApril 30, 1986
Term endedDecember 23, 2001
Application numberEP 81110749
Classification (CPC)C07C317/00 +2 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.