Patents Assigned to Charles Mankouski
  • Step ladder
    Patent number: 4437545
    Abstract: A step ladder for use on an uneven surface including an arcuate leveling member adapted to hold the step ladder straight on an uneven surface with means for securing the leveling member in any selected position.
    Type: Grant
    Filed: November 30, 1981
    Date of Patent: March 20, 1984
    Assignee: Charles Mankouski
    Inventor: Ernest Pardee