Expired Canadian patentCanada
Well fracturing
CA 698448 A · Owner: The Dow Chemical Company · Inventors: Arthur Park; Louis H. Eilers
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordNo Claude kit for weapons
Claude doesn't help design weapons, ammunition or explosives, so this page has no Reinvent kit. To develop this one, work with a federally licensed manufacturer (many of these items are regulated) and a registered patent attorney or agent, listed on the USPTO roster.
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 November 24, 1964. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 1981.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedNovember 24, 1964
Term endedNovember 24, 1981
Patent numberCA 698448 A
Classification (IPC)E21B43/26 +2 more
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.