Mixture of a radioactive tracer substance and a propellent for marking drilling tools for deep wells and similar boreholes
CA 878993 A · Owner: Farbwerke Hoechst Aktiengesellschaft Vormals Meister Lucius And Bruning · Inventors: Herbert Becker
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents.
Why it's free to use
- Granted August 24, 1971. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 24, 1988.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.