Blast cleaning system
CA 2081397 A1 · Owner: Waste Minimization And Containment Services, Inc. · Inventors: Armstrong, Jay
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to carbon dioxide blase cleaning system. In the present invention the propelling of, the dry-ice pellets is provided by cryogens namely liquid, nitrogen and/or liquid oxygen supplied under high pressure. In a preferred embodiment liquid carbon dioxide pellets are placed into a pellet hopper and a portable liquid nitrogen and/or liquid air storage tank is employed. The pellet hopper and the blast unit and blast gun(s) are located at the blast site, the portable cryogenic liquid nitrogen and/or liquid air tank with an ambient air vaporizer are located at or near the blast site. In this invention, as distinguished from the prior art, all the equipment and material for …
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 October 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2014.
- 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.