Place and bundle method for the manufacture of brush seals
CA 2109807 C · Owner: Howe, Harold · Inventors: Howe, Harold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A long ribbon, composed of a multitude of fine wires, is placed at the requisite bristle angle onto a backing ring. A torch, welds the ribbon to the backing plate and simultaneously severs the ribbon forming a first bundle of wires. The severed ribbon is repositioned, relative to the backing ring adjacent to the first bundle, and the ribbon is again welded in-place and cut. The procedure of placement welding and cutting is repeated until the backing plate (or the ribbon) has been repositioned over the desired length of the plate to achieve the requisite bristle array of the brush seal.
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 September 30, 1991 and granted December 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 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.