Patents Assigned to Castrol Ltd.
  • Patent number: 5523431
    Abstract: The present application relates to a method of producing an amide product mixture having a low content of secondary amines by reacting an amide product mixture having a high secondary amine content with an aliphatic alkylene oxide in the absence of an essential amount of any alkoxylation catalyst. The amide product mixture obtained contains a minor amount of tertiary amines and exhibits advantageous properties when used for the formulation of cosmetic products, such as shampoos and creams; foam cleaning compositions, e.g. for textiles and cars; and functional fluids, such as lubricants, metal working fluids and hydraulic fluids.
    Type: Grant
    Filed: October 29, 1993
    Date of Patent: June 4, 1996
    Assignees: Berol Nobel AB, Castrol Ltd.
    Inventor: Rolf Skold
  • Patent number: 5435414
    Abstract: A lubricating recirculation system for use with highly viscous lubricants and semi-fluid lubricants such as high viscosity base oil gels and greases. The system includes a bulk lubricant container for storing fresh lubricant that is applied to the use points of the mechanisms as controlled by a controller such as programmable logic controller. After application to the mechanism components, the lubricant falls therefrom and accumulates on guards or channels which help to funnel the lubricant into a spent lubricant holding tank. Sensors in both the bulk lubricant container and the spent lubricant holding tank, in connection with the controller, monitor the level of lubricant in both tanks and activate a transfer pump when the level of lubricant in either tank reaches a certain level.
    Type: Grant
    Filed: January 5, 1994
    Date of Patent: July 25, 1995
    Assignee: Castrol Ltd.
    Inventor: Charles D. Barrett