Expired Canadian patentCanada
Roller chain idler replacement
CA 2090590 C · Owner: Rogus, Thomas E. · Inventors: Rogus, Thomas E.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tightener roller 40 replace idler sprockets in roller chain 20 applications to decrease noise and reduce wear on the system components. The roller chain 20 wears parallel alignment grooves 50 52 in the resilient material 44 of the tightener 40.
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 February 26, 1993 and granted May 5, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 26, 1993
GrantedMay 5, 1998
Term endedFebruary 26, 2013
Patent numberCA 2090590 C
Classification (IPC)B27B17/00 +2 more
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.