Sheet metal duct system having integral transverse flanges
CA 1206894 A · Owner: Engel Industries, Inc. · Inventors: Fischer, Herbert J.; Merideth, John D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Integral transverse flanges on duct sections made up for example, of two L-shaped work pieces are readily assembled into permanent rigid section-joining frames. At the frame corners the interfitted flanged, ends of corner pieces are trapped adjacent to the integral flange webs, behind an outward-turned ridge on a surface of the duct and beneath an inward and backward turned spring margin having a progression of lanced projections. Tabs, extending across the lines of juncture of the Lshaped pieces along the outward turned ridge are peened over to seal, the joints of the work pieces positively and prevent the escape of air. Easily applied clips hold the flanges of the adjacent duct …
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
- Granted July 2, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 2, 2003.
- 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.