Patents by Inventor Rolf W. J. Campbell

Rolf W. J. Campbell 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).

  • Patent number: 5111932
    Abstract: A spreadable material package includes a first and a second sheet joined together to form a chamber for holding the spreadable material. The package includes a spreader portion at one end that is in flow communication with the chamber so that spreadable material can flow from the chamber to the spreader portion. The package includes a stiffening portion having spaced apart indentations for providing a stiffening effect to the spreader portion.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: May 12, 1992
    Assignee: Land O'Lakes, Inc.
    Inventor: Rolf W. J. Campbell
  • Patent number: 4648506
    Abstract: A package with spreader is hermetically sealed for storing relatively stiff spreadable materials such as butter until ready for use. The package includes a base having a relatively stiff spreader blade partially defined by a blade spread side surface and an opposed base supply side. The base also includes a deformable blister for holding the spreadable material. The blister is open through the blade to its spread side surface and extends outwardly from the blade on the supply side of the base. A peelable membrane initially seals the butter inside of the blister by being in sealing relation to the spread side surface of the blade. A portion of the membrane is manually peelable from sealing relation with respect to part of the blade and uncovers a portion of the blister to provide a butter delivery opening through which the butter can be forced by digital pressure on the outside of the blister. The butter can then be immediately spread using the sealing side surface of the blade.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: March 10, 1987
    Assignee: Land O'Lakes, Inc.
    Inventor: Rolf W. J. Campbell