Patents by Inventor Clarence McKeithan, Jr.

Clarence McKeithan, Jr. 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: 5236558
    Abstract: A method to recycle spent ethylene glycol in a continuous process for the manufacture of polyethylene terephthalate in at least one reactor vessel which includes:a. condensing the overhead vapor of spent ethylene glycol, water and other byproducts from the reactor vessel,b. feeding the condensed vapor to a single distillation column,c. removing only part of the water and other byproducts from ethylene glycol by distillation overhead in the column andd. feeding the resultant bottoms of the column back to the reactor vessel as recycle ethylene glycol along with virgin ethylene glycol, so that polyethylene terephthalate polymer being manufactured by the continuous process is essentially unaffected regarding polymer color and ability to be spun into high quality yarn, but with lower diethylene glycol content that polymer made from all virgin ethylene glycol.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: August 17, 1993
    Assignee: Allied-Signal Inc.
    Inventors: Edward J. Buyalos, David Pendlebury, Lon K. Bouknight, Neil F. Blake, Clarence McKeithan, Jr.