A leak-proof hydraulic device for a barber's chair and the like
CA 2235397 C · Owner: Kigel, Rudolf · Inventors: Kigel, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The hydraulic device for raising and lowering seat of the barber's chair has a main housing section and a lower section. A sliding plunger is slidably mounted in a sleeve extending between the lower section and the top cover of the main housing section. An oil pump is operative to force the oil contained with the main housing section into a channel in the lower section to the bottom of the sleeve for raising or lowering the sliding plunger. The seat of the barber's chair is mounted to the top of the sliding plunger. The joint between the lower section and the main housing section is permanently sealed with a metal compound by welding brazing or, soldering.
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 April 20, 1998 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2020.
- 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.