Tiltable chair
CA 2005776 C · Owner: Wilkhahn Wilkening + Hahne Gmbh + Co. · Inventors: Franck, Klaus; Sauer, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a chair in which the back rest is supported by at least one rear lever via a swivel joint and the seat is supported by a front connecting element on the pedestal in such a way that when the back rest is tilted forwards or backwards the seat simultaneously carries out an approximately horizontal movement and the rear part of the seat carries out a greater lifting or lowering movement than the front part of the seat, which is aided in a simple manner by the fact that the front connecting element is formed by an element with limited flexibility.
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 December 18, 1989 and granted February 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2011.
- 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.