Structure for expansion and contraction of guard baton
CA 2067308 A1 · Owner: Ashihara, Hideyuki · Inventors: Ashihara, Hideyuki; Ashihara, Hideyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
An expansion and contraction type guard baton causing less rattling or deviation even after repeating use and free from the worry of slipping off by the force of thrusting and extending the baton main body even if the wall thickness is decreased to reduced the weight. A plurality of cylindrical members are combined in a telescopic manner in which the conically inclined surface at the top end of an outer cylindrical member and a conically inclined surface at the rear end of an inner cylindrical member are engaged for preventing slip-off upon extension. The circumferential cylindrical slide guide surface in parallel with the cylindrical axis formed before and after the conically inclined …
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.
Why it's free to use
- Filed April 27, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2014.
- 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.