Light weight drive shaft
CA 2034691 C · Owner: Simon, Joseph A. · Inventors: Simon, Joseph A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A light weight drive shaft, such as for use as an automotive vehicle engine drive shaft for transmitting engine power, is extruded from a tubular metal blank into an elongated tube having integral center and opposite end sections, with the center section having a thin wall and the end sections having a thick wall. The shaft is formed by inserting a tubular blank within a tubular die having a constricted die throat through which the blank is extruded. A punch having a lead end punch extension is inserted within the die, against the trailing end of the blank, with its extension extending part way into the blank. Movement of the punch towards the die throat extrudes the blank through the …
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 22, 1991 and granted January 15, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2013.
- 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.