Speed measuring apparatus and toy for measuring speed of moving member
CA 2224403 C · Owner: Hudson Soft Co. Ltd. · Inventors: Okada, Setsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A speed measuring apparatus and a toy for measuring a speed of a moving member has a quartz oscillator for generating a clock signal which has a predetermined frequency, a CR oscillator for generating a clock signal which has a higher frequency than that of the quartz oscillator, a comparative circuit connected with the quartz, oscillator and the CR oscillator for comparing the oscillation frequency of the quartz oscillator as a reference signal with the oscillation frequency of the CR oscillator a, corrective circuit, connected with the comparative circuit for calculating a corrective, factor in accordance with a result from the comparative circuit a measuring unit, connected with the CR …
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 December 10, 1997 and granted July 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2019.
- 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.