Patents by Inventor Maarten H. Van Ooijen

Maarten H. Van Ooijen 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).

  • Filter cartridge
    Patent number: 5344559
    Abstract: The invention relates to a filter cartridge including a filter element equipped with two annular flanges and two supporting cages. In order to be able to disassemble the filter cartridge for the purpose of facilitating disposal, the two annular flanges are provided with inner and outer threads. Four mounting rings are provided with mating inner and outer threads and can be screwed onto the annular flanges while being supported on the two supporting cages. Once the threaded rings are tightened, the filter element is under tension.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: September 6, 1994
    Assignee: Votech Filter GmbH
    Inventor: Maarten H. Van Ooijen