Patents by Inventor Frank V. Oirschot

Frank V. Oirschot 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).

  • Air return for venturi system
    Patent number: 5328301
    Abstract: An air return is useable in a venturi system having an upstream air induction member feeding a product flow line downstream of the air induction member. The air return itself comprises a housing having a product flow region to be fitted in line with the product flow line, an air draw region separated from the product flow region by a perforate divider with a baffle internally of the divider and an air flow line from the housing to be fitted back to the air induction member.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: July 12, 1994
    Inventor: Frank V. Oirschot
  • Inline venturi for pneumatic conveying systems
    Patent number: 5002092
    Abstract: The present invention provides an adjustable venturi device designed for efficient use with blowers of various different capacities. The venturi device of the present invention includes a blower feedable positive air passage and a negative pressure air inlet exposed to and operated by air draw from the positive air passage. The venturi device is adjustable for varying exposure of the air inlet to the positive air passage with resultant varying of the air draw according to capacity of the particular blower used with the venturi device.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: March 26, 1991
    Inventor: Frank V. Oirschot