Process and apparatus for fabricating honeycomb material
CA 2050381 C · Owner: Hunter Douglas Inc. · Inventors: Goodhue, William V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and apparatus for making expandable honeycomb structures suitable for use as window coverings. In one embodiment, folded tubular strips with adhesive lines are fed continuously through a cutter which cuts them into predetermined lengths. The cut strips are then accelerated to a stacker for further processing before the next cut strip arrives. In another embodiment, webs of material are fed continuously in a downstream direction, adhesive lines are applied, a middle web is slitted into strips, and the strips bonded along opposite edges to the outer webs. By choosing for the outer webs transparent or porous material, and for the middle web opaque material a light or air, controlling …
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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 30, 1991 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 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.