Soft core pig
CA 2200792 C · Owner: Watts, Robert · Inventors: Watts, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipeline pig suitable for use in cleaning deposits and buildup from a pipeline is also particularly suited for applications wherein the pipeline has a series of bends or even right angle corners. The pig is suitable for bidirectional travel, having front and rear hemispherical noses. The pig is constructed in a manner that facilitates a greater degree of elongation and deformation than is possible with known pipeline pigs while still providing the radially outward bias that is required to effectively scrape the sidewalls of the pipeline. A cover carries a plurality of metal studs arrayed about the cylindrical middle portion and, encloses an internal core. The core is formed in a mold from …
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
- Filed March 24, 1997 and granted December 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 2019.
- 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.