Patents by Inventor Lewis J. Hill

Lewis J. Hill 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).

  • Plug for a key operated lock
    Patent number: 4231242
    Abstract: A plug for a key operated lock is provided with a plurality of bores transverse to the key slot formed through the plug. The bores accept studs which extend into the key slot to delimit the design of key blanks from which keys, fitting the lock, can be constructed. The selection of bores to contain studs permits rapid change of key blank designs for the lock.
    Type: Grant
    Filed: October 23, 1978
    Date of Patent: November 4, 1980
    Assignee: U-Change Lock Industries, Inc.
    Inventors: Lewis J. Hill, Bill J. Dillard