Aluminum drive shaft
CA 2219309 A1 · Owner: American Axle & Manufacturing, Inc. · Inventors: Barrett, Mark S.; Menosky, Marc M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aluminum drive shaft includes an aluminum alloy torque tube and aluminum alloy yokes that are pressed into each end section of the torque tube and welded to the end of the torque tube. Each end section is reduced in diameter and joined to a larger central section by a transition section. The end sections and transition sections are formed by swaging the ends of an aluminum alloy tube blank radially inwardly in two stages. The transition sections include an annular rib in the form of a concentric circular band located midway between inner and outer conical portions. The annular ribs stiffen the transition sections to reduce oil canning and noise.
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 October 24, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2019.
- 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.