Drive system roller apparatus
CA 2038024 C · Owner: Imai, Masao · Inventors: Imai, Masao; Fujio, Yoshihiko; Hatouchi, Gokichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drive system roller aparatus used for a roller conveyer built in a shelf device or a roller conveyer installed on a floor, wherein at the outer periphery of a roller shaft suppoted at a frame is provided a roller body rotatable and suppoting a load to be transported, between the roller body and the roller shaft is provided an annular flexible member which is capable of expanding and contracting so as to contact with and remove from the inner periphery of the roller body by the erxpansion and contraction and the flexible member is rotatably deiven so that, an operating fluid is supplied from the fluid route into the flexible member, and the flexible membe in the contacting state is …
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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 March 12, 1991 and granted April 26, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.