Patents by Inventor Charles L. Mulchi

Charles L. Mulchi 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-pollution filter and face mask
    Patent number: 4141703
    Abstract: A flexible polymeric mask, which covers the mouth and at least the lower part of the nose, has exhale-valve means and vertical supporting means for air-intake filter means. The filter means provides a wearer of the mask with air which has passed, in sequence, through, e.g., porous foam, activated charcoal, filter paper, absorbent cellulose and gauze.
    Type: Grant
    Filed: March 4, 1977
    Date of Patent: February 27, 1979
    Assignee: Stanley I. Wolf
    Inventor: Charles L. Mulchi
  • Air-pollution filter and face mask
    Patent number: 4064876
    Abstract: A flexible polymeric mask, which covers the mouth and at least the lower part of the nose, has exhale-valve means and vertical supporting means for air-intake filter means. The filter means provides a wearer of the mask with air which has passed, in sequence, through, e.g., porous foam, activated charcoal, filter paper, absorbent cellulose and gauze.
    Type: Grant
    Filed: January 30, 1976
    Date of Patent: December 27, 1977
    Assignee: Stanley I. Wolf
    Inventor: Charles L. Mulchi