Patents by Inventor Edwin J. Wolf

Edwin J. Wolf 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).

  • Fluid drain device
    Patent number: 6126142
    Abstract: A drain system for a liquid container such as an oil sump comprising an insert into the container, a combination tool and a safety plug. The insert contains a ball-type check valve which is opened by insertion of the combination tool, which may be held in place by rotation to engage a locking pin in the drain. The safety plug is insertable in the drain plug and tightened with a handle on the combination tool.
    Type: Grant
    Filed: May 12, 1999
    Date of Patent: October 3, 2000
    Inventors: Edwin J. Wolf, Edith M. Wolf