Wrench
CA 2204091 A1 · Owner: Shang, Jong-Hsing · Inventors: Shang, Jong-Hsing
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A wrench is composed of a fixed member and a movable member fastened pivotally with the fixed member such that the second clamping portion of the movable member and the first clamping portion of the fixed member can cooperate. The fixed member is provided with a pivoting slot in which the second pivoting portion of the movable member is pivoted so as to enable the first clamping portion of the fixed member and the second clamping portion of the movable member to work together to hold and turn a relatively small and thin nut bolt, etc.
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 April 30, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 30, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 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.