Spiral-formed exhaust tube
CA 2290585 A1 · Owner: Arvin Industries, Inc. · Inventors: Lebeau, Phillip E.; Turnbow, Rondal Wayne; Holt, Tommie A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is provided for producing a spiral-formed exhaust tube (12). Material (14) having spaced-apart first and second edges (50 52) and a die (86) having , a groove (96) are provided. Louvers (32) are formed in the material (14). The material (14) is rolled into a tube using the die (86) so that the louvers (32) extend outwardly away from a longitudinal axis (84) of the tube (12). The louvers (32) pass through the groove (96) of the die (86) as the material (14) is rolled into the tube (12). The first and second edges (50 52) of the , material (14) are then connected.
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 14, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 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.