Injection device for injecting articles into trees and a method of treating same
CA 2039447 C · Owner: Duff, Michael · Inventors: Duff, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed an apparatus and method for treating trees. The apparatus includes an injecting device for injecting articles into trees. The device provides a plurality of article retaining tubes fixedly connected to a removable and rotatable delivery head and stationary therewith. A slidably mounted injection member is provided which slides coaxially along the tubes from a non-injecting position to an injecting position for injecting an article into a tree.
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 March 28, 1991 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.