THERMALLY STABLE OIL-BASE DRILLING FLUID - Patent 0610393

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EP 0 610 393 A1

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(43)	Date of publication:
	17.08.1994 Bulletin 1994/33

(21)	Application number: 92923322.0

(22)	Date of filing: 22.10.1992

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International Patent Classification (IPC):

C09K 8/ 32^{( . )}

C09K 8/ 36^{( . )}

(86)	International application number:
	PCT/US1992/009160

(87)	International publication number:
	WO 1993/009201 (13.05.1993 Gazette 1993/12)

(84)	Designated Contracting States:
	DK GB NL

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Priority:

31.10.1991 US 19910786034

(71)	Applicant: UNION OIL COMPANY OF CALIFORNIA
	Los Angeles California 90017 (US)

(72)	Inventors:
	VAN SLYKE, Donald, C. Brea, CA 92621 (US) STEINWAND, Paul, J. Placentia, CA 92670 (US) SPADA, Lonnie, T. Walnut, CA 91789 (US)

(74)	Representative: Baillie, Iain Cameron
	c/o Ladas & Parry Altheimer Eck 2 D-80331 München D-80331 München (DE)

(54)	THERMALLY STABLE OIL-BASE DRILLING FLUID