Patents by Inventor Lloyd E. Postlethwait

Lloyd E. Postlethwait 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).

  • Dust control on long wall shearing machines
    Patent number: H23
    Abstract: An improved dust control apparatus for a shearing machine which has attached thereto a spray bar apparatus mounted to and extended from said shearing machine and containing a curtain for dust control and a plurality of spray heads along said spray bar, an improvement in the spray bar apparatus is provided by mounting an extendable spray bar to said spray bar with a hydraulic cylinder attached to said extendable spray bar so that it can be extended or retracted as said shearing machine reaches the end of its cut so that said extendable portion is not damaged when the shearing machine reaches the end of its cut. The extendable portion includes spray heads and a curtain for dust control purposes.
    Type: Grant
    Filed: November 7, 1984
    Date of Patent: February 4, 1986
    Inventors: John B. Riester, David M. Miller, Lloyd E. Postlethwait