The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 1977
Filed:
May. 27, 1975
Frederick A Bain, Willowdale, CA;
John O Roberts, Toronto, CA;
Great Canadian Oil Sands Limited, Toronto, CA;
Abstract
A method for reducing the sludge content of a retention pond associated with the hot water process for extracting bitumen from tar sands which comprises admixing a sludge stream containing at least 12% solids by weight with a hot water extraction process waste water stream containing at least 20% sand; settling the mixture in a settling zone to form an upper layer substantially reduced in mineral matter and a lower layer comprised of a sand-sludge mixture and dispersing said lower layer over a sand pile zone to provide additional sand layers thereon containing at least a part of the sludge in the interstices of said additional sand layers.