On contact herbicide applicator
CA 2283594 C · Owner: Nylen, Terrance Dale · Inventors: Nylen, Terrance Dale
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Prior on contact herbicide applicators were generally too large to selectively apply herbicide to weeds without also getting herbicide on closely adjacent desired vegetation they also generally did not allow the User to see where herbicide had been applied. In the instant invention a herbicide container suitable for single hand operation is filled with a combination of liquid herbicide and a weed colouring element. The top end of the herbicide container has a herbicide release head that prevents the liquid herbicide and colouring element mixture from being released until suitable pressure is applied to it. The herbicide container is relatively small therefore the User is able to rub the …
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 September 9, 1999 and granted September 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2021.
- 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.