Patents by Inventor Robert Madeira Andrews

Robert Madeira Andrews has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Amido- and imido- peroxycarboxylic acid bleach granules
    Patent number: 5770551
    Abstract: A bleach granule is provided with 60-100% being an intimate mixture of an amido or imido C.sub.2 -C.sub.30 peroxy acid and a surfactant, in a weight ratio of 20:1 to 1:20. The most preferred peroxyacids are N,N-phthaloylaminoperoxycaproic acid (PAP); monononylamide of either peroxysuccinic acid (NAPSA) or peroxyadipic acid (NAPAA) and N,N'-terephthaloyl-di(6-aminoperoxycaproic acid) (TPCAP). Localized dye damage from the peroxy acid bleach is prevented by the presence of the surfactant. Bleach compositions and a method for cleaning a stained substrate with the bleach granule are also described.
    Type: Grant
    Filed: August 19, 1996
    Date of Patent: June 23, 1998
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Philip Alan Block, Samuel Qcheng Lin, Robert Madeira Andrews, Scott David Manske