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:
May. 14, 1991
Filed:
Mar. 23, 1990
Stephen E Eisenstein, Houston, TX (US);
Wayne J Kuchler, Kenner, LA (US);
Shell Oil Company, Houston, TX (US);
Abstract
A process for the preparation of a lubricating grease which comprises (a) dispersing in a major amount of a lubricating oil at about 180.degree. F. to about 200.degree. F. an effective amount of a saponifiable fatty material and lithium base to neutralize the fatty material, (b) then heating the resulting mixture from (a) to about 385.degree. F. to about 410.degree. F. at about ambient pressure to dissolve said fatty material, (c) homogenizing the resulting mixture from (b) at about 80 to about 200 psi while maintaining the temperature, (d) cooling the resulting mixture to a temperature below about 370.degree. F., (e) adding calcium base to the resulting mixture to saponify the remaining (unsaponified) fatty material at about 290.degree. F. to about 360.degree. F. and about ambient pressure, and (f) homogenizing the resulting mixture at about 100 to about 150 psi while maintaining the temperature to obtain a lubricating grease composition. Preferably, the calcium bae in step (e) is substantially dry and is added at a temperature of from about 310.degree. F. to about 360.degree. F.