Viscosity modification of hydrocarbonaceous materials
CA 1054754 A · Owner: Otisca Industries · Inventors: Keller, Douglas V. (Jr.); Smith, Clay D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PREAMBLE TO DISCLOSURE, BE IT KNOWN THAT CLAY D. SMITH and DOUGLAS V. KELLER JR. citizens of the United States of America of, Deer Run Road, Lafayette, New York and 2724 Lafayette Road New York, United States of America respectively having, made an invention entitled, MODIFICATION OF HYDROCARBONACEOUS MATERIALS the following disclosure contains a correct and full description of the invention and of the best mode known to the inventors of taking advantage of the same. -1-
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
- Granted May 22, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 1996.
- 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.