Patents by Inventor Nellis D. Van Krevelen

Nellis D. Van Krevelen 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).

  • Patent number: 4098509
    Abstract: A golfing device for audibly indicating improper head movement of a golfer during a golf swing. A support is clamped to a golfer's hat, a headband or the like and movably secures a sound-producing element adjacent the golfer's head. Any head movement beyond a predetermined, slight amount in generally any direction will cause the sound-producing device to audibly signal the golfer. In the preferred embodiment, a pivotally mounted bell is adjusted to accommodate the stance of the particular golfer using the device so that the bell striker is out of contact with the bell interior prior to a swing.
    Type: Grant
    Filed: June 8, 1977
    Date of Patent: July 4, 1978
    Inventor: Nellis D. Van Krevelen