Method of cleaning heater tubes with a pig
CA 2650817 C · Owner: On Stream Technologies Inc. · Inventors: Sivacoe, Orlande
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of cleaning tubing in an operating heater in which the tubing has an inlet and an outlet. While the heater is in operation a hollow, metallic and/or tubular mesh pig is run through the tubing from the inlet to the outlet. Cleaning should be done before contaminant has hardened. An improved pipe pig preferably hollow, metallic and/or made from tubular mesh has scraping edges made from longitudinal edges of a wire. The tubular mesh may be a knit weave or may be knotted. The pig is preferably radially expandable up to twice its fully compressed radius and may have an expander to force it radially outward. The pipe pig is preferably made of a resilient wire having a polygonal …
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 October 29, 1998 and granted August 5, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2020.
- 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.