Method and apparatus using bituminous sandstone for pavement repair
CA 1296212 C · Owner: Bushman, Norman P. · Inventors: Astrope, Myrle E.; Bushman, Norman P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method, apparatus and material for filling or surfacing fissures, openings and cavities in a pavement surface. The method comprises the steps of preparing a volume of water, heated to a temperature of 110-210 degrees F, and mixing a given quantity of bituminous sandstone therein in a ratio of 20 to 56% water by weight. This mixture is continuously agitated to develop a slurry which is capable of being pumped through a conduit to the repair location or site. Apparatus is disclosed for preparing the subject slurry and for enabling a continuous repair operation within a self-contained system.
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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
- Granted February 25, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 25, 2009.
- 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.