Patents by Inventor David W. Fischer

David W. Fischer 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).

  • Stepped output steam humidifier
    Patent number: 4675505
    Abstract: A vaporizing humidifier includes a portion for providing stepwise increases and decreases in vapor output capacity in response to the duration of a vapor demand signal, for matching the vapor output to the demand therefore.
    Type: Grant
    Filed: January 21, 1986
    Date of Patent: June 23, 1987
    Assignee: Armstrong International, Inc.
    Inventor: David W. Fischer