Patent Yard Sign in
Expired European patentEurope

Tooth configuration for an earth boring bit

EP 0121802 B1 · Applicant: Eastman Christensen Company

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 March 11, 1984 and granted February 28, 1990. A European patent lasts at most 20 years from filing, so its term ended March 11, 2004.
  • 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 September 11, 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.
FiledMarch 11, 1984
PublishedOctober 17, 1984
GrantedFebruary 28, 1990
Term endedMarch 11, 2004
Application numberEP 84102652
Classification (CPC)E21B47/18 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMarch 11, 1984PublishedOct 17, 1984Patent grantedFeb 28, 1990Term endedMarch 11, 2004

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.