Expired European patentEurope
Method for improving the electrical insulating characteristics of a fraction, electrical insulating substance, and electrical appliances containing the same
EP 0281162 B1 · Applicant: NIPPON PETROCHEMICALS COMPANY, LIMITED
Overview
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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, 1983 and granted June 12, 1996. A European patent lasts at most 20 years from filing, so its term ended December 23, 2003.
- 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, 2009.
- 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, 1983
PublishedSeptember 7, 1988
GrantedJune 12, 1996
Term endedDecember 23, 2003
Application numberEP 88104568
Classification (CPC)C07C5/3332 +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.