Plant-killing device
CA 2058291 A1 · Owner: Humphrey, Ernest D. · Inventors: Humphrey, Ernest D.; Humphrey, Ernest D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A weed-killing device has an elongate hollow handle (10) having a hollow body (11) adjustably mounted on one end the body having , electric heating elements therewithin and an outlet nozzle (12). A chamber (17) is provided part-way along the handle (10) and an electric motor driven fan unit (16) is arranged to draw air into the chamber (17) and drive the air along the handle through, coupling (19), over the heating elements and out of the nozzle (12). Hand grips (21 and 22) are provided for ease of use. An internal combustion engine driving a fan and an electric generator may be provided within the chamber (17) instead of the electric motor driven fan unit, waste heat from the motor …
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 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 20, 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.