Sulfur additives for paving binders and manufacturing methods
CA 2454595 C · Owner: Shell Canada Limited · Inventors: Bailey, William R.; Pugh, Norm D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sulfur, useable in as an additive to asphalt in the preparation of asphalt binders can , be plasticized by addition of carbon and further treated with amyl acetate. This plasticized , sulfur can be formed into solid particles and then added to asphalt as either a minority or , majority component to create desired paving binder compositions. The solid plasticized sulfur , has non-stick non-flow properties within a wide range of ambient temperatures and it can be , stored solid for subsequent use in paving applications.
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 August 9, 2002 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 9, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2024.
- 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.