Nozzle unit and method for using wet abrasives to clean hard surfaces
CA 2041188 C · Owner: Gardner, Jeffrey G. · Inventors: Gardner, Jeffrey G.; Gulau, Dennis J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a nozzle unit designed for use with wet abrasive materials to clean hard surfaces such, as steel structures. The nozzle unit is formed from two nozzle bodies, which are joined together. Each body has a lengthwise bore therein, with a venturi structure and, a metallic liner is fitted into each bore. Inside the nozzle unit is an annular cavity, which is connected into a source of water and a mixing chamber. The nozzle unit also has air passages therein that connect the mixing chamber with air surrounding the nozzle unit. In a wet blasting operation, an abrasive material such as, sand, is directed into the mixing chamber where it, mixes with water and air to form a wet …
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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 April 25, 1991 and granted December 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 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.