Expired European patentEurope
Method of securely interrupting the electric power supply from a low-frequency or direct voltage source to a load, and apparatus for carrying out the method
EP 0100331 B1 · Applicant: TELEFONAKTIEBOLAGET L M ERICSSON
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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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 January 26, 1983 and granted August 2, 1989. A European patent lasts at most 20 years from filing, so its term ended January 26, 2003.
- 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 July 26, 2008.
- 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.
FiledJanuary 26, 1983
PublishedFebruary 15, 1984
GrantedAugust 2, 1989
Term endedJanuary 26, 2003
Application numberEP 83900504
Classification (CPC)H02M7/2173 +2 more
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.