Pneumatic height adjustment column for a chair
CA 2223137 C · Owner: Van Wieran, Steve · Inventors: Van Wieran, Steve
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pneumatic height adjustment column is provided for a chair. The column includes a support tube (7), carrier tube (13) pneumatic cartridge (17), hub , fastener (35) and shaft fastener (51). The support tube has a top end which is generally open, and a bottom portion (9) which is adapted to be mounted to a chair base. The bottom portion has an opening (16) with a smaller diameter than that of the support tube (7). The carrier tube (13) has a top portion adapted to be mounted to a support housing (6) for a chair seat. The top portion has an opening with a smaller diameter than that of the carrier tube (13). The carrier tube (13) also has a generally open bottom end which …
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 June 5, 1996 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2018.
- 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.