Petroleum oil having improved flow properties
CA 2021246 C · Owner: Gruenig, Heinz · Inventors: Mueller, Michael; Gruenig, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Crude oils vacuum gas oils, and residual oils containing long chain polyalkyl (meth)acrylates as flow improvers wherein, the long chain polyalkyl (meth)acrylates are a mixture of (A) a polyalkyl (meth)acrylate P1 having an onset of crystallization at temperatures above 15°C (measured as the cloud point of a 0.1 % solution in isooctane) and (B) a polyalkyl (meth)acrylate P2 having an onset of crystallization at temperatures at or below 15°C with the proviso that there is a temperature difference of at least 5 Centigrade degrees between the onset of the crystallization of polyalkyl (meth)acrylates P1 and the onset of crystallization of polyalkyl (meth)acrylates P2.
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 July 16, 1990 and granted March 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 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.