Patents by Inventor Robert C. Bergvist

Robert C. Bergvist 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).

  • Mechanically frothed plastisols
    Patent number: 5334622
    Abstract: An improved process for production and delivery of a plastisol foam is provided. By the process, plastisol foam is maintained under controlled pressures and conditioned to enhance homogeneity and percent foam. Also provided is a process for intermittently dispensing a fluid such as a plastisol foam, by which drip may be prevented. Additionally provided is novel apparatus for preventing drip.
    Type: Grant
    Filed: October 6, 1993
    Date of Patent: August 2, 1994
    Assignee: Rutland Plastic Technologies, Inc.
    Inventor: Robert C. Bergvist