Dynamic hardness testing using measurement of the scarton dynamic hardness (SDH)
September 8, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 465505 Electrostatic expression encoding apparatus for percussive keyboard instruments Method and apparatus for quantitatively evaluating roll hardness Process for the acoustic examination of monoliths for damage and device for implementing the process In situ dynamic material property measurement system Quantitative method for evaluation of the state of piano hammer felt tonal regulation Method and equipment for measuring firmness of fruits and vegetables Patent #: 5691473 InventorsAssigneeApplicationNo. 388493 filed on 02/14/1995US Classes:73/82Impact typeExaminersPrimary: Raevis, RobertAttorney, Agent or FirmInternational ClassG01N 003/30AbstractA method and apparatus for determining the degree of dynamic hardness of a material, such as a sporting equipment item. The method includes the steps of impulsively exciting a surface of the material by impacting the surface against a second, relatively hard surface in contact with a force-measuring device, and then measuring a signal from the force-measuring device to determine a frequency-dependent spectrum of the force exerted by the excited surface on the second surface. From this data, a roll-off frequency is measured and then analyzed to determine the degree of dynamic hardness of the material. | |
