Patents by Inventor Robert H. Hofeldt

Robert H. Hofeldt 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).

  • Sealed containers and sealing compositions for them
    Patent number: 5227411
    Abstract: A sealing composition for a container closure comprising a polymeric matrix material and is modified by the inclusion therein of an oxygen scavenger. The composition can be in fluid or meltable form ready for application to a closure or it can be present as a deposit on the closure, for instance a gasket around the closure. Preferably the scavenging properties of the deposit are activated by pasteurizing or sterilizing the deposit when sealing a container with the closure. The invention is of particular value when the closure is a metal cap for a beer bottle.
    Type: Grant
    Filed: January 14, 1992
    Date of Patent: July 13, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Robert H. Hofeldt, Steven A. C. White
  • Sealed containers and sealing compositions for them
    Patent number: 5204389
    Abstract: A sealing composition for a container closure comprising a polymeric matrix material and is modified by the inclusion therein of an oxygen scavenger. The composition can be in fluid or meltable form ready for application to a closure or it can be present as a deposit on the closure, for instance a gasket around the closure. Preferably the scavenging properties of the deposit are activated by pasteurizing or sterilizing the deposit when sealing a container with the closure. The invention is of particular value when the closure is a metal cap for a beer bottle.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: April 20, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Robert H. Hofeldt, Stephen A. C. White
  • Sealed containers and sealing compositions for them
    Patent number: 5106886
    Abstract: A sealing composition for a container closure comprises a polymeric matrix material and is modified by the inclusion therein of an oxygen scavenger. The composition can be in fluid or meltable form ready for application to a closure or it can be present as a deposit on the closure, for instance a gasket around the closure. Preferably the scavenging properties of the deposit are activated by pasteurizing or sterilizing the deposit when sealing a container with the closure. The invention is of particular value when the closure is a metal cap for a beer bottle.
    Type: Grant
    Filed: April 3, 1991
    Date of Patent: April 21, 1992
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Robert H. Hofeldt, Stephen A. C. White
  • Plastisol sealing gaskets puffed with hollow discrete spheres
    Patent number: 4485192
    Abstract: A container sealing composition made from a plastisol having a mass of hollow discrete microspheres incorporated therein. The composition is characterized by having increased shelf life, as manifested in reduced separation of the hollow discrete microspheres from the plastisol, and improved viscosity stability. The container sealing composition also exhibits uniform void volume which is essential for good sealability and seal quality.
    Type: Grant
    Filed: June 14, 1983
    Date of Patent: November 27, 1984
    Assignee: W. R. Grace & Co.
    Inventors: David A. Gibbs, Robert H. Hofeldt, Charles A. Billings
  • Sealing compositions for minimizing soluble iron migration
    Patent number: 4278718
    Abstract: Composition and method for sealing containers containing vegetable based beverages, i.e. beer, ale, wine, fruit and vegetable juices.
    Type: Grant
    Filed: January 11, 1980
    Date of Patent: July 14, 1981
    Assignee: W. R. Grace & Co.
    Inventors: Charles A. Billings, Robert H. Hofeldt