Liquid spray machine for coating interior of pipes
CA 2073880 C · Owner: Commercial Resins Company · Inventors: Hart, Milburn L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a spray machine for spraying liquid coating material onto the interior surface of a pipeline. The spray machine is provided with a movable frame which can be rolled on attached wheel assemblies through the pipeline and positioned with its spray gun pointing toward the interior pipe surface. The frame serves as a base to which the other parts of the spray machine attach. The spray gun and an attached hollow gun rotating shaft continuously rotate axially within the pipeline. When the spray gun is properly positioned, the spray gun is mechanically turned on and off by a cable attached to a gun actuating arm which is pivotally mounted on a bracket attached to the gun rotating …
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 July 15, 1992 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2014.
- 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.