Homogeneous electro-viscous liquids
CA 2122718 C · Owner: Pirck, Dietrich · Inventors: Grasshoff, Hans-Dieter; Pirck, Dietrich; Kohnz, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Homogeneous electro-viscous fluids are provided which comprise aluminium soaps based on products obtained by reacting one or more polycarboxylic acid(s) or the anhydrides or semi-esters thereof with aluminium alcoholates. The aforersaid fluids manifest a high electro-rheological effect and are completely homogeneous.
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 November 30, 1992 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2014.
- 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.