Expired European patentEurope
A method for subterraneously, or at least mainly subterraneously, placing a piping system, for instance for temporarily storing heat, in a preferably water saturated ground, as well as a piping system placed subterraneously, or at least mainly subterraneously, by applying said method
EP 0026025 B1 · Applicant: HOLLANDSCHE BETON GROEP N.V.
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.
Why it's free to use
- Filed September 22, 1980 and granted November 9, 1983. A European patent lasts at most 20 years from filing, so its term ended September 22, 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 March 22, 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.
FiledSeptember 22, 1980
PublishedApril 1, 1981
GrantedNovember 9, 1983
Term endedSeptember 22, 2000
Application numberEP 80200892
Classification (CPC)F28D20/0052
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.