Sheave cleaning tool
CA 2115956 A1 · Owner: Maclean, Ian Arthur · Inventors: Maclean, Ian Arthur
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
My device relates to a device to clean sheaves such as those used in the operation, of elevators. A particular application of my device is as a sheave cleaning tool. The present invention the sheave cleaning tool, comprises of a mounting plate and a blade plate attached by a hinge. A handle is welded to the blade plate to enable the the operator to raise and lower the blade, altering the level of pressure of the blade applied, to the sheave, without the operator having any contact with the blade or sheave. When this pressure is applied, the blade is lowered into the groove of the sheave cutting and scraping, away hardened rope tar that has been packed into the grooves of the sheave which …
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 18, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 18, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 2016.
- 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.