Patents by Inventor John Stefiuk

John Stefiuk 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).

  • System and methods with scavenging capabilities for simultaneously filling and evacuating a plurality of separate pressure vessels
    Patent number: 4333503
    Abstract: A system and methods with scavenging capabilities for simultaneously filling and evacuating a plurality of separate pressure vessels including valved conduits interconnecting a source of pressurized fluid and a source of vacuum separately to at least two pressure vessels whereby while one vessel is being filled the other is being evacuated and means to connect an evacuated tank to portions of the system for the purpose of using the vacuum therein to scavenge residue gas in said portions.
    Type: Grant
    Filed: January 30, 1980
    Date of Patent: June 8, 1982
    Inventor: John Stefiuk