Patent Yard Sign in
Expired European patentEurope

Circuit for a serially operating digital filter

EP 0090904 B1 · Applicant: ITT INDUSTRIES 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 April 3, 1982 and granted August 21, 1985. A European patent lasts at most 20 years from filing, so its term ended April 3, 2002.
  • 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 October 3, 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.
FiledApril 3, 1982
PublishedOctober 12, 1983
GrantedAugust 21, 1985
Term endedApril 3, 2002
Application numberEP 82710020
Classification (CPC)H03H17/0223 +1 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedApril 3, 1982PublishedOct 12, 1983Patent grantedAug 21, 1985Term endedApril 3, 2002

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.