Patent Yard Sign in
Expired European patentEurope

Aluminum nitride products and processes for the production thereof

EP 0271353 B1 · Applicant: Asahi Kasei Kogyo Kabushiki Kaisha

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed December 11, 1987 and granted March 18, 1992. A European patent lasts at most 20 years from filing, so its term ended December 11, 2007.
  • 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 11, 2013.
  • 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 11, 1987
PublishedJune 15, 1988
GrantedMarch 18, 1992
Term endedDecember 11, 2007
Application numberEP 87310906
Classification (CPC)C04B35/581 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedDec 11, 1987PublishedJune 15, 1988Patent grantedMarch 18, 1992Term endedDec 11, 2007

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.