Patents by Inventor Ronald L. Derbyshire

Ronald L. Derbyshire 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).

  • Halogen-containing organic stabilizers for 3-isothiazolones
    Patent number: 5142058
    Abstract: A method of stabilizing 3-isothiazolones against chemical degradation in antagonistic environments by the use of certain activated halogen compounds is disclosed. Compositions including 3-isothiazolones and alkyl halohydantoins, halo-substituted triazinetriones, N-halosuccinimides, p-toluenesulfonyl halides, haloacetic acids and alkyl sulfamoyl halides are found to be particularly stable in metal working fluids and latex paints.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: August 25, 1992
    Assignee: Rohm and Haas Company
    Inventors: Gary L. Willingham, Ronald L. Derbyshire
  • Use of hydrazide stabilizers for 3-isothiazolones
    Patent number: 5118699
    Abstract: Composition comprising (A) 3-isothiazolone antimicrobial compound and (B) an amount of a second hydrazide compound to stabilize said 3-isothiazolone, and method of stabilizing 3-isothiazolone antimicrobial compound, and method of use to inhibit growth of bacteria, fungi, algae, and yeast at a locus are disclosed.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: June 2, 1992
    Assignee: Rohm and Haas Company
    Inventors: Gary L. Willingham, Ronald L. Derbyshire