Wax separation process
CA 1111781 A · Owner: Imperial Oil Limited · Inventors: Broadhurst, Thomas E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Particles of solid wax are separated from a slurry comprising said wax particlesand a hydrocarbon oil by filtering the slurry through a cloth filter medium. It has been found that using as the filter medium, a needled-felt cloth fabricated from fibers fusible by means of an open flame and having a singed surface on which the wax is collected results in an unexpected reduction in filter cloth blinding thereby yielding up to 30% increased throughput through the filter cloth and greatly reducing the frequency of washing the filter cloth.The cloth is further characterized in that it has a permeability to air in excess of about 3 cubic feet per minute per square foot of cloth surface at a …
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 November 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1998.
- 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.