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. 24, 1995
Filed:
Jan. 18, 1994
Applicant:
Inventor:
Abbas Kadkhodayan, Collinsville, IL (US);
Assignee:
Ethyl Petrolium Additives, Inc., Richmond, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C10M / ;
U.S. Cl.
CPC ...
252 / ; 252 18 ; 252 35 ; 252 499 ; 556 25 ;
Abstract
This invention relates to a process for the production of overbased metal salts of hydrocarbyl dithiophosphoric acid comprising: a) treating hydrocarbyl dithiophosphoric acid with an effective amount of phosphorus sulfide at a temperature within the range of from about 50.degree. to about 200.degree. C.; and b) neutralizing the treated hydrocarbyl dithiophosphoric acid with an amount of metal oxide; whereby the effective amount of phosphorus sulfide is sufficient to form a basic metal salt of the dithiophosphoric acid having a base metal to phosphorus ratio within the range of from about 1.15:1 to about 1.3:1.