Process for producing transformer oil from a hydrocracked stock
CA 2039485 C · Owner: Butler, Kevin David · Inventors: Butler, Kevin David; Olavesen, Christopher
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to the production of a formulated transformer oil by the process involving fractionating the product coming from a hydrocracker to produce a distillate boiling in the transformer oil range, dewaxing the fraction optional-, ly hydrofinishing the fraction and adding to said fraction an effective amount of anti-oxidant and/or pour point depressant. The formulated transformer oil produced by this process has properties equivalent to those of formulated naphthenic transformer oil.
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 March 28, 1991 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2013.
- 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.