Rubber spring element
CA 2008357 C · Owner: Pletsch, Hubert · Inventors: Wolf, Franz Josef; Pletsch, Hubert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
For the formation of a particularly soft characteristic curve of the spring, the rubber spring element consisting of a relatively hard and mechanically solid material is so interspersed with hollow spaces and hollow ducts intersecting same that the area of the inside cross section of the hollow ducts is at least 25% of the area of the nearest hollow space interspersed by said hollow duct, the hollow ducts being capable of directly intersecting in the rubber matrix.
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 January 23, 1990 and granted October 12, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 2012.
- 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.