Patents Assigned to Redken Laboratories
  • Tensile strength tester for hair
    Patent number: 4628742
    Abstract: Apparatus for measuring tensile strength of hair samples in which the test is controlled automatically to provide the average value of a plurality of hair samples. The apparatus is digitally controlled to provide a rapid testing cycle time. Tension is applied by a pivoted arm, and rotated by a solenoid that is controlled digitally to provide substantially constant velocity to the arm. A strain gage secured to the arm measures the force extended by the arm in tensioning the hair sample.
    Type: Grant
    Filed: May 20, 1985
    Date of Patent: December 16, 1986
    Assignee: Redken Laboratories
    Inventor: Frank E. Golding