Lightweight adjustable track "power dozer"
CA 2179136 C · Owner: Maxwell, Grant D. · Inventors: Maxwell, Grant D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a lightweight adjustable track earth moving device. More particularly this invention is directed to an improved efficient light-weight adjustable track earth moving device which can be attached at the front end of an endless track vehicle and used for efficiently moving earth from one location to another, for example, into a ditch or excavation. Apparatus for moving earth comprising: (a) a vehicle; (b) earth contacting means mounted on said vehicle for moving earth in one direction; (c) a reversible horizontally travelling endless track earth moving means mounted in association with said earth contacting means for moving earth lateral to said one direction; (d) …
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 June 14, 1996 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 14, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 2018.
- 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.