Pigging fluid transportation pipeline systems
CA 1295097 C · Owner: Kershaw International Limited · Inventors: Kershaw, Christopher Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipeline pig for pigging a fluid transportation pipeline especially one in which a cable or other line is permanently deployed, comprises on a central tubular shaft an array of radial-bristle planar brushes which are spaced apart in planes normal to the axis of the shaft by spacers and in some cases by groups of sail cloth diaphragms secured between spacers. The brush bristles comprise resilient plastics filaments (preferably nylon) coated with an abrasive material such as carborundum and have a radial, length such that when the pig is inserted in a pipeline. the bristles are deflected and curved rearwardly so that a substantial part of each bristle lies in contact with the internal …
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 February 4, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 4, 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.