Compost processing tool
CA 2046409 C · Owner: Sainsbury, J. Doulgas · Inventors: Sainsbury, J. Doulgas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a compost processing tool having a blade at one end thereof suitable for chopping, cutting and turning compost. The tool also includes a hollow shaft extending from the blade with the shaft having a host of openings through a wall of the shaft with the holes spaced in the length of the shaft. This hollow shaft may be used to provide a lever for the blade used during chopping, cutting and turning of the compost and the shaft also serves as a breather tube when placed in a volume of compost with the shaft partially buried in the compost.
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 July 5, 1991 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2013.
- 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.