Patents by Inventor Ralph G. Heysek

Ralph G. Heysek 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).

  • Aircraft pneumatic air filter
    Patent number: 5505753
    Abstract: An aircraft pneumatic air filter includes a pair of cup-shaped interconnected cover having respective inflow and outflow nozzles and a filter cartridge maintained in the cavity defined therebetween. A scale provided on one of the covers allows for visual inspection of the filter cartridge and comparison against the scale to determine the need for filter replacement or system service.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: April 9, 1996
    Inventor: Ralph G. Heysek