Alternating tip run process for pipe cleaning
CA 2192716 C · Owner: Praxair Technology, Inc. · Inventors: Sims, Peggy L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for pipe cleaning using a cleaning module which is propelled through the pipe by a hydraulic fluid and has at least two cleaning tips attached in a particular alternating sequence. The hydraulic fluid is inspected to determine when no further abrasive cleaning is required. When such a determination is made another tip is applied to finish the surface of the pipe.
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 December 12, 1996 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2018.
- 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.