Patents by Inventor Fred Avila, Jr.

Fred Avila, Jr. 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).

  • Extensible and collapsible portable derrick
    Patent number: 3978989
    Abstract: An extensible and collapsible portable derrick in which the various parts are made from a light weight metal and in which the parts can be disassembled and arranged in compact units, light enough in weight and small enough in size to be readily transportable by a person. The device is primarily designed to be used by operators who use tar paper and gravel for covering flat roofs of buildings whether or not the roofs are provided with parapets.
    Type: Grant
    Filed: February 7, 1975
    Date of Patent: September 7, 1976
    Inventor: Fred Avila, Jr.