Patents by Inventor Robert Y. Pan

Robert Y. Pan 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).

  • Detergent compositions comprising large pore size redox catalysts
    Patent number: 5560748
    Abstract: Laundry and cleaning compositions which comprise large pore size redox catalysts.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: October 1, 1996
    Assignee: The Procter & Gamble Company
    Inventors: Athanasios Surutzidis, Robert Y. Pan, Gregory S. Caravajal, James C. T. R. Burckett-St. Laurent
  • Sulfonated poly-ethoxy/propoxy end-capped ester oligomers suitable as soil release agents in detergent compositions
    Patent number: 5415807
    Abstract: Anionic sulfonated poly-ethoxy/propoxy, especially modified isethionate, end-capped esters useful as soil release agents in detergent compositions are presented. The terephthalate esters are homogeneously integrated with one or more crystallization-reducing stabilizers.
    Type: Grant
    Filed: September 17, 1993
    Date of Patent: May 16, 1995
    Assignee: The Procter & Gamble Company
    Inventors: Eugene P. Gosselink, Robert Y. Pan, Patti J. Kellett, Robin G. Hall
  • Polyhydroxy fatty acid amides in soil release agent-containing detergent compositions
    Patent number: 5332528
    Abstract: Disclosed is a detergent composition containing one or more anionic surfactants and one or more soil release agents characterized by the presence of an anionic surfactant-interactive nonionic hydrophile and/or an anionic surfactant-interactive hydrophobic moiety, or both, and a soil release agent-enhancing amount of a polyhydroxy fatty acid amide surfactant of the formula: ##STR1## wherein R.sup.1 is H, C.sub.1 -C.sub.4 hydrocarbyl, 2-hydroxy ethyl, 2-hydroxy propyl, or a mixture thereof, R.sub.2 is C.sub.5 -C.sub.31 hydrocarbyl, and Z is a polyhydroxylhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative thereof.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: July 26, 1994
    Assignee: The Procter & Gamble Company
    Inventors: Robert Y. Pan, Eugene P. Gosselink
  • Sulfobenzoyl end-capped ester oligomers useful as soil release agents in granular detergent compositions
    Patent number: 5256168
    Abstract: Anionic, sulfobenzoyl end-capped esters useful as soil release agents in granular detergent compositions. The terephthalate esters contain oxyethyleneoxy and oxy-1,2-propyleneoxy units, and are substantially amorphous in form.
    Type: Grant
    Filed: September 22, 1992
    Date of Patent: October 26, 1993
    Assignee: The Procter & Gamble Company
    Inventors: Stephen W. Morrall, Eugene P. Gosselink, Robert Y. Pan, Bala C. Nayar
  • Sulfobenzoyl end-capped ester oligomers useful as soil release agents in granular detergent compositions
    Patent number: 5182043
    Abstract: Anionic, sulfobenzoyl end-capped esters useful as soil release agents in granular detergent compositions. The terephthalate esters contain oxyethyleneoxy and oxy-1,2-propyleneoxy units, and are substantially amorphous in form.
    Type: Grant
    Filed: July 25, 1991
    Date of Patent: January 26, 1993
    Assignee: The Procter & Gamble Company
    Inventors: Stephen W. Morrall, Eugene P. Gosselink, Robert Y. Pan, Bala C. Nayar