Patents by Inventor Kenneth P. Grinager

Kenneth P. Grinager 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).

  • Self-propelled concrete tamping apparatus
    Patent number: 5236279
    Abstract: A self-propelled concrete tamping apparatus (10) in which a tamper screen (70) is rapidly moved in vertical reciprocating strokes upon concrete or other paving material while being guided by an operator. Engine (18) powers drive wheel (28) which propels the apparatus backward, as well as powers tamper screen (70) with reciprocating motion. Drive wheel (28) and free wheel (30) are adjustable in position to allow for adjustment of tamping depth.
    Type: Grant
    Filed: September 8, 1992
    Date of Patent: August 17, 1993
    Inventor: Kenneth P. Grinager