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Current content: 155 395 919 patent documents

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132 468 new documents added

1 248 785 documents amended

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EP 0261793 A1 19880330 - Recovery of heavy oil.

Title (en)

Recovery of heavy oil.

Title (de)

Gewinnung von Schweröl.

Title (fr)

Récupération d'huile lourde.

Publication

EP 0261793 A1 19880330 (EN)

Application

EP 87307419 A 19870821

Priority

GB 8620705 A 19860827

Abstract (en)

Heavy crude oil is recovered from tar sands by treatment with an aqueous solution containing a surfactant, e.g., an alkyl aryl sulphonate and a hydrophlic alkylene oxide polymer, e.g., polyethylene oxide. Adding the alkylene oxide polymer enables the surfactant to be used in lower concentration and/or recovery to be increased.

IPC 1-7

C10G 1/04

IPC 8 full level

C10G 1/04 (2006.01)

CPC (source: EP)

C10G 1/047 (2013.01)

Citation (search report)

US 4491514 A 19850101 - SISKIN MICHAEL [US], et al
US 4427528 A 19840124 - LINDOERFER WALTER [DE], et al
US 4571294 A 19860218 - FRIEDMAN ROBERT H [US], et al

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

EP 0261793 A1 19880330; CA 1293464 C 19911224; GB 8620705 D0 19861008

DOCDB simple family (application)

EP 87307419 A 19870821; CA 544557 A 19870814; GB 8620705 A 19860827