Method of detecting failure to tighten screws against works and device therefor
CA 2010132 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Hirabayashi, Junzou
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of detecting failure to tighten screws against works includes steps of detecting every screw tightening operation against a work after start of a screw tightening step, counting the number of times of the screw tightening operations detected in the previous step detecting the, completion of the screw tightening step and comparing a, counted value at the time of the completion of the screw tightening step with a predetermined value thereby, informing of a result of comparison. A device for carrying out this method includes a current relay responsive to a large load current during the tightening operation of an electric screwdriver in a screw tightening step a, presettable counter …
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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 February 15, 1990 and granted August 23, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2012.
- 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.