Process for producing rubber modified asphalt cement
CA 2182181 C · Owner: Flanigan, Theodore P. · Inventors: Flanigan, Theodore P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a homogeneous asphalt product which is a two-member composition of distillation tower bottoms and ground tire rubber homogenized therein includes, in one embodiment introducing distillation tower bottoms at a temperature of about 425°-470°F to a vessel through which air is flowing at about 6-15 psi pressure introducing ground tire rubber to the vessel and bombarding the distillation tower bottoms and ground tire rubber with the air until the mixture is completely and stably homogenized, and recovering the homogenized asphalt composition. In another embodiment, the ground tire rubber is mixed directly with the distillation tower bottoms to form a wetted mixture which …
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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 January 23, 1995 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 2017.
- 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.