Patents by Inventor Maurice W. Putman

Maurice W. Putman 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 for destructive distillation of hydrocarbonaceous materials
    Patent number: 4075083
    Abstract: A method of retorting oil shale which comprises the steps of passing the material in particulate form downwardly as a continuous vertical column of solid material successively through a preheating zone, a distillation zone, a combustion zone, and a residue cooling zone. An improved method of product oil recovery is disclosed whereby the vapor product is subjected to sequential treatment with cyclone separators and an absorption column, with a portion of the resulting noncondensible gases being recycled to the retort.
    Type: Grant
    Filed: June 11, 1976
    Date of Patent: February 21, 1978
    Inventor: Maurice W. Putman