Method and apparatus for cutting erosive materials using high pressure water means
CA 2064205 C · Owner: Burgess, Stanley Robert · Inventors: Burgess, Stanley Robert; Higgins, Christopher Lyndon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for cutting erosive materials such as stone and the like includes a high-velocity high-pressure water lance (1), which can be raised and lowered as necessary. The lower end of the water lance carries a cutting head in the form of a nozzle assembly (4) able to be rotated about the longitudinal axis (5) of the water lance instead of merely being able to be oscillated as in prior art apparatus. The water lance (1) is mounted upon a carriage (9) which can be propelled in directions at right angles to each other and the water lance (1) may be supported by a vertically-disposed truss (2) which itself may be relocatable about the longitudinal axis of the lance.
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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 June 26, 1990 and granted April 29, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2012.
- 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.