Expired European patentEurope
Method for coded transmission of speech signals, use of the method in a time-division multiplex transmission system and device for carrying out the method
EP 0010600 B1 · Applicant: International Business Machines Corporation
Overview
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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.
Why it's free to use
- Filed September 12, 1979 and granted March 9, 1983. A European patent lasts at most 20 years from filing, so its term ended September 12, 1999.
- 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 March 12, 2005.
- 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.
FiledSeptember 12, 1979
PublishedMay 14, 1980
GrantedMarch 9, 1983
Term endedSeptember 12, 1999
Application numberEP 79103407
Classification (CPC)H04B1/66
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.