Subterranean well casing float tool
CA 1309652 C · Owner: Rubbo, Richard P. · Inventors: Rubbo, Richard P.; Forehand, Richard L.; Lehr, Douglas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
BKKR 6443, blb:MD#20:D17, SUBTERRANEAN WELL CASING FLOAT TOOL ABSTRACT OF THE DISCLOSURE, A subterranean well casing float tool is comprised of a tubular metal housing which is securable to a well casing conduit. Valving means are implaced within the housing with, substantially all of the components of the valving means save, a biasing means, are thermosetting. The valving means has a thermoplastic frame and valve head and valve seat means relative to the frame. A biasing member, such as a compressed spring is used for urging the valve head toward the valve seat to a closed position. A compartment including the valve head is provided for enclosure around the biasing means when the valve …
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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, and the Claude kit works from them.
Why it's free to use
- Granted November 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 2009.
- 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.