Locking differential including a spring cap biasing assembly
CA 2218834 C · Owner: Tractech Inc. · Inventors: Dissett, Walter L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A locking differential includes a plurality of spring biasing assemblies each consisting solely of a helical spring having a spring cap member mounted onone end thereof for isolating the spring from the associated locking pin that extends at one end within the oversized spring bore. The spring cap member has adisc portion the outer diameter of which is at least as great as the outer diameter of the helical spring, and a central plug portion that extends within the spring whereby the spring bears at one end solely against the cap disc portion and is isolated thereby from the locking pin. The diameter of the cap disc portion is also less than the width of a radially extending access opening …
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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 November 10, 1997 and granted November 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 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.