Patents by Inventor Michael Paul Hoague

Michael Paul Hoague 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).

  • Respiratory filter element having a storage device for keeping track of filter usage and a system for use therewith
    Patent number: 6186140
    Abstract: The present invention provides for a filter assembly (124) which includes a filter element (128) and a memory device (402). The memory device (402) allows for a record of the filter element's usage to be available at all times even if the filter assembly (124) is moved from one filtering system to another one. In another embodiment of the invention, the filter assembly (124) interacts with a filtering device such as air unit (130) which periodically updates the memory device (402) while the air unit (130) is operational. The air unit (130) also periodically checks to see if the filter assembly (124) has reached the end of its useful life. If so, the air unit provides an audible and/or visual alarm.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: February 13, 2001
    Assignee: 3M Innovative Properties Company
    Inventor: Michael Paul Hoague