Bitumen granulate and a process for its preparation
CA 2032764 A1 · Owner: Muller, Karl-Hans · Inventors: Barthel, Walter; Muller, Karl-Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bitumen granulate and a process for its preparation Bitumen granulate containing from 0.5 to 15% by weight preferably from 6.1 to 15% by weight, of a powdering and separating agent such as, for example, synthetic silica or carbon black is produced by atomizing hot liquid bitumen, in a known spray mixer and at the same time introducing the powdering and separating agent into the spray mixer by way of the stream of cold air.
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 December 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2012.
- 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.