Patents by Inventor Christopher C. Coffey

Christopher C. Coffey 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).

  • Flushed-seal respirator
    Patent number: 6957653
    Abstract: Improved full-face, flushed-seal respirators are provided having a primary sealing element adjacent to a breathing space and a secondary sealing element. Exhaled air (i.e., clean air obtained by passage through a filtering element or elements) is passed from the breathing space into a flushing channel formed between the primary and secondary seals. If there is leakage in the primary seal, air from this flushing channel leaks into the breathing space rather than ambient air. Air within the flushing channel will predominately be air that has already passed through the filtering elements. The present invention provides, therefore, an inexpensive respirator which provides significantly more protection than conventional negative-pressure respirators.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: October 25, 2005
    Assignee: The United States of America as represented by the Secretary of the Department of Health and Human Services
    Inventors: Donald L. Campbell, Christopher C. Coffey, William A. Hoffman, Judith B. Hudnall
  • Flushed-seal respirator
    Publication number: 20030131846
    Abstract: Improved full-face, flushed-seal respirators are provided having a primary sealing element adjacent to a breathing space and a secondary sealing element. Exhaled air (i.e., clean air obtained by passage through a filtering element or elements) is passed from the breathing space into a flushing channel formed between the primary and secondary seals. If there is leakage in the primary seal, air from this flushing channel leaks into the breathing space rather than ambient air. Air within the flushing channel will predominately be air that has already passed through the filtering elements. The present invention provides, therefore, an inexpensive respirator which provides significantly more protection than conventional negative-pressure respirators.
    Type: Application
    Filed: December 10, 2002
    Publication date: July 17, 2003
    Inventors: Donald L. Campbell, Christopher C. Coffey, William A. Hoffman, Judith B. Hudnall