Expired Canadian patentCanada
Heat exchanger
CA 2024491 C · Owner: Phillips Petroleum Company · Inventors: Kwok, Tai Wai
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shell-and-tube heat exchanger with a tube sheet having false partition grooves which allows the periodic rotation of a removable heat exchanger tube bundle, as well as a method of performing such rotation.
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 August 31, 1990 and granted March 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 31, 1990
GrantedMarch 15, 1994
Term endedAugust 31, 2010
Patent numberCA 2024491 C
Classification (IPC)F28F9/24 +2 more
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.