Patent Yard Sign in
Expired European patentEurope

Method for determining the minority carrier surface recombination lifetime constant(ts) of a specimen of semiconductor material

EP 0656643 B1 · Applicant: SEMITEST, INC.

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 November 29, 1994 and granted July 19, 2000. A European patent lasts at most 20 years from filing, so its term ended November 29, 2014.
  • 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 May 29, 2020.
  • 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.
FiledNovember 29, 1994
PublishedJune 7, 1995
GrantedJuly 19, 2000
Term endedNovember 29, 2014
Application numberEP 94402719
Classification (CPC)G01R31/2656

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedNov 29, 1994PublishedJune 7, 1995Patent grantedJuly 19, 2000Term endedNov 29, 2014

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.