Patents by Inventor Henry E. Perlee

Henry E. Perlee 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).

  • Method and apparatus for measuring surface density of explosive and inert dust in stratified layers
    Patent number: 4793710
    Abstract: A method for determining the surface density of coal dust on top of rock dust or rock dust on top of coal dust is disclosed which comprises directing a light source at either a coal or rock dust layer overlaying a substratum of the other, detecting the amount of light reflected from the deposit, generating a signal from the reflected light which is converted into a normalized output (V), and calculating the surface density from the normalized output. The surface density S.sub.c of coal dust on top of rock dust is calculated according to the equation:S.sub.c =1/-a.sub.c ln(V)wherein a.sub.c is a constant for the coal dust particles, and the surface density S.sub.r of rock dust on top of coal dust is determined by the equation: ##EQU1## wherein a.sub.r is a constant based on the properties of the rock dust particles. An apparatus is also disclosed for carrying out the method of the present invention.
    Type: Grant
    Filed: June 9, 1987
    Date of Patent: December 27, 1988
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Michael J. Sapko, Henry E. Perlee