Wavy heat transfer surface
CA 2043012 C · Owner: Kraay, Michael L. · Inventors: Kraay, Michael L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat exchanger surface for a refrigeration system comprising a wavy heat exchanger surface formed with a series of peaks and troughs extending over the wavy surface in a direction substantially perpendicular to the direction of airflow. The wavy surface includes a plurality of holes aligned in first and second rows parallel to the peaks and troughs, where the aligned holes within each row are separated by a smooth area. The wavy surface includes louvers for enhancing heat transfer. The louvers are located between the peaks and troughs on the wavy surface, but are not located in the smooth areas between the aligned holes of the first and second holes.
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 May 22, 1991 and granted November 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2013.
- 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.