Bitumen compositions and a process for their preparation
CA 2237773 A1 · Owner: Van Gooswilligen, Gerrit · Inventors: Steernberg, Koen; Van Gooswilligen, Gerrit; Phillips, Michael Christopher
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a process for preparing a bitumen composition comprising blowing a mixture with an oxygen-containing gas which mixture comprises a bitumen having a penetration of less than 300 dmm (as measured by ASTM D 5 at 25°C), a thermoplastic rubber which is present in an amount of less than 10 %w and a bitumen blowing catalyst which is present in an amount of more than 0.5 %w and up to 3 %w, both based on total mixture; bitumen compositions obtainable by such process; and the use of such bitumen compositions in a bitumen for industrial 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 May 14, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2020.
- 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.