Patents Assigned to Mildred M. Robison
  • Basement sump construction
    Patent number: 3939863
    Abstract: A basement sump construction characterized by a sump chamber including a side wall provided with a drain outlet opening. A trap apparatus for the unidirectional flow of water is removably mounted on the sump side wall so as to be easily accessible to cleaning and servicing through a top access opening in the sump.
    Type: Grant
    Filed: July 10, 1974
    Date of Patent: February 24, 1976
    Assignee: Mildred M. Robison
    Inventor: John Crosby Robison