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:
Jan. 10, 1995
Filed:
Feb. 07, 1994
Abbas Kadkhodayan, Collinsville, IL (US);
Dale G Pillsbury, Oilville, VA (US);
Paul G Griffin, Collinsville, IL (US);
Ethyl Petrolium Additives, Inc., Richmond, VA (US);
Abstract
This invention relates to a process for preparing an overbased metal salt of hydrocarbyl dithiophosphoric acid comprising neutralizing hydrocarbyl dithiophosphoric acid with an amount of metal oxide sufficient to form said overbased metal salt of hydrocarbyl dithiophosphoric acid, which metal oxide has a surface area of no less than about 4 m.sup.2 per gram up to about 12 m.sup.2 per gram and whereby the overbased metal salt of hydrocarbyl dithiophosphoric acid thus formed has a base metal to phosphorus weight ratio within the range of greater than about 1.2:1 up to about 1.3:1.