Swing phase control device
CA 2124841 C · Owner: Biedermann Motech Gmbh · Inventors: Fitzlaff, Gerhard
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 swing phase control device for an artificial knee joint prosthesis facilitating a natural sequence of movements and capable of reacting to abrupt movements. The swing phase control device consists of a piston and cylinder arrangement (2). There is a first chamber (8) on one side of the piston (12) and a second chamber (17) on the other. Both chambers can be interconnected via a first choke (38 43). There is a second choke on the outlet side of the second chamber (17) which connects the latter to a fluid tank. The pressure in the second chamber (17) is applied to a control piston. It is designed in such a way that the second choke (32) closes when the pressure in …
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 28, 1993 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2015.
- 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.