Method and apparatus for preventing erroneous operation in non-contact push-button switch
CA 2015181 C · Owner: Shibata, Michio · Inventors: Umemura, Heihachiro; Shibata, Michio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and an apparatus for preventing erroneous operation in a non-contact push-button switch. This method is to impress pulse power on a non-contact switch, to discriminate good or bad of the output signal from the switch and to give selectively an operation signal to a driving circuit. Even if an operation output is given from the switch while the, push-button is in OFF state due to trouble of electronic parts constituting a non-contact push-button no signal, which means operation is given from the discrimination circuit and accordingly the OFF state is maintained and unreasonable working of the apparatus or other trouble does not take place.
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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 April 23, 1990 and granted June 7, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 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.