Patents by Inventor Marcia A. Ulrich

Marcia A. Ulrich 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 filter system
    Patent number: 6077336
    Abstract: An air filter system that includes a mechanism for notifying a user when a proper filter replacement period had elapsed that further includes a scenting mechanism for scenting the air flowing through the filter system with a pleasant odor. The air filter system includes a scent impregnated filter element held within a filter element frame provided with a user notification system and multiple scent impregnated strips.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: June 20, 2000
    Inventors: Marcia A. Ulrich, Uwe J. Ulrich