Pipeline pig with longitudinally incompressible member
CA 1077655 A · Owner: Girard, Harry J. · Inventors: Girard, Harry J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipeline pig of the type to be propelled through a pipeline by a pressure gradient in the line to clear accumulations and deposits of sludge, scale and other material from the walls of the pipe. The pig includes an elongated cylindrical foamed elastomer body member and a substantially incompressible column member, located generally co-axially within and with ends ex-, tending beyond the ends of the body member.
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, and the Claude kit works from them.
Why it's free to use
- Granted May 20, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 20, 1997.
- 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.