Method of making a lanced and offset fin
CA 2452771 A1 · Owner: Granetzke, Dennis C. · Inventors: Granetzke, Dennis C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Slow production speeds in the manufacture of lanced and offset finds for use in heat exchanger tubes are eliminated through the use of a method of forming the fins involving a plurality of roll assemblies (60 62, 64, 66, 68, 70) , located along a forming path which may operate on a strip (56) of fin forming material of indetermine length. After being formed the fin may be cut to any , desired length.
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 21, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 21, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2024.
- 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.