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Expired European patentEurope

Gas ionisation detector and tomodensitometer using such a detector

EP 0029758 B1 · Applicant: THOMSON-CSF

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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.

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Why it's free to use

  • Filed October 17, 1980 and granted April 20, 1983. A European patent lasts at most 20 years from filing, so its term ended October 17, 2000.
  • 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 April 17, 2006.
  • 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.
FiledOctober 17, 1980
PublishedJune 3, 1981
GrantedApril 20, 1983
Term endedOctober 17, 2000
Application numberEP 80401481
Classification (CPC)H01J47/02

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedOct 17, 1980PublishedJune 3, 1981Patent grantedApril 20, 1983Term endedOct 17, 2000

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

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