Expired Canadian patentCanada
Pour-point depression of crude oils by addition of tar sand bitumen
CA 1284466 C · Owner: Soderberg, David John · Inventors: Soderberg, David John
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for reducing the pour point of a crude oil by adding a pour-point depressant selected from the group consisting of raw bitumen and hydrotreated bitumen to form a blend possessing a relatively lower pour point.
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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 May 28, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 18, 1987
GrantedMay 28, 1991
Term endedMay 28, 2008
Patent numberCA 1284466 C
Classification (IPC)C10G1/00 +2 more
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.