Patents by Inventor Robert E. Keirn

Robert E. Keirn 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).

  • Patent number: 3955288
    Abstract: Continuous flow grain drying apparatus having an upper, foraminous drying enclosure into which grain to be dried is introduced and which communicates with a lower, foraminous cooling enclosure. A first enclosed, foraminous duct in the upper enclosure defines therewith a first pair of passages which divide the downward flow of grain into two separate parallel streams, a blower and burner combination communicating with the first duct causing outward flow of heated air simultaneously through the first passages. A second, enclosed, foraminous duct is provided in the lower enclosure defining therewith a second pair of passages and a divider connects the first and second ducts and extends through the open ends of the upper and lower enclosures thereby coupling respective ones of the first and second passages so that the two streams respectively continue separate, downward, parallel flow through the second passages.
    Type: Grant
    Filed: February 18, 1975
    Date of Patent: May 11, 1976
    Inventor: Robert E. Keirn