Patents by Inventor Elder F. Hirsch

Elder F. Hirsch 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).

  • Vacuum breaker valve
    Patent number: 4209033
    Abstract: Sill cock having novel vacuum breaking stem packing assembly to break a vacuum between the shut-off valve and the sill cock. A novel vacuum breaker shut-off valve is also provided adapted to close upon the presence of a vacuum or reduced pressure in the main water line.
    Type: Grant
    Filed: January 31, 1979
    Date of Patent: June 24, 1980
    Inventors: Elder F. Hirsch, Ronald F. Hirsch
  • Vacuum breaker valve and stem packing assembly
    Patent number: 4206777
    Abstract: Sill cock having novel vacuum breaking stem packing assembly to break vacuum between the shutoff valve and the cock and a vacuum breaker shut off valve to close same upon encountering a vacuum or reduced pressure in the main.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: June 10, 1980
    Inventors: Elder F. Hirsch, Ronald F. Hirsch
  • Vacuum breaker for valve stem packing
    Patent number: D246251
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: November 1, 1977
    Inventors: Elder F. Hirsch, Ronald F. Hirsch