Flexible duct
CA 1052712 A · Owner: Wood, Cecil H. · Inventors: Wood, Cecil H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The following specification disclose a flexible duct constructed from a spiral of channel-shaped metal with the legs of the channel facing inwards of the spiral. A strip of cloth or other flexible webbing material is formed into a spiral with its overlapping edges folded into the channel of the spiral with a cord or string filling the remainder of the channel cavity before the channel legs are crimped together to maintain the webbing strips edges fast together within its grip. The expansibility of the duct is increased by increasing the width of strip of webbing.
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 April 17, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 1996.
- 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.