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:
Aug. 28, 2001
Filed:
Nov. 09, 1998
Applicant:
Inventors:
Philip Skinner, Oxfordshire, GB;
Alain Louis Pierre Lenack, Rouen, FR;
Assignee:
Infineum USA L.P., Linden, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C11D 1/700 ;
U.S. Cl.
CPC ...
C11D 1/700 ;
Abstract
A method of manufacturing a calcium overbased detergent, of TBN at least 300, from at least two surfactants, at least one of which is a phenol surfactant or a salicylic acid surfactant. Overbasing is carried out in at least two steps, at a temperature of less than 100° C., at least one of the overbasing steps being followed by a heat-soaking step. The overbased detergents produced may be useful marine diesel lubricant additives.