Patents by Inventor Roy S. Lanham

Roy S. Lanham 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).

  • Chain trencher
    Patent number: 4195427
    Abstract: An excavator digs trenches by partial buckets on a vertical chain which is adjustable as to contact with the ground by two hydraulic cylinders. The excavator is built upon a frame having wheels, with the back wheels being driven by a hydraulic motor so that the vehicle creeps forward at a very slow speed. Excavated dirt is contained by the partial buckets in conjunction with a plate behind the buckets. The dirt is then transferred by means of troughs on the buckets to a belt which conveys it away from the trench.
    Type: Grant
    Filed: July 20, 1978
    Date of Patent: April 1, 1980
    Assignee: Lanham Manufacturing Co., Inc.
    Inventor: Roy S. Lanham