Patents by Inventor Ronald K. Nilsen

Ronald K. Nilsen 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: 4582642
    Abstract: This invention is a method to recover caprolactam from a combined stream of mother liquor from a caprolactam crystallizer and other lactam containing aqueous streams, the improvement comprising steam distilling the combined stream at a temperature of from between about 180.degree. C. to 235.degree. C. in the absence of any depolymerization agent such as phosphoric acid; so that the residue from the steam distilling remains fluid; relatively low levels of caprolactam remain in the residue; less residue is generated; the recovered caprolactam has improved high quality; and losses of caprolactam due to side reactions are reduced.
    Type: Grant
    Filed: June 27, 1984
    Date of Patent: April 15, 1986
    Assignee: Allied Corporation
    Inventors: Lamberto Crescentini, William B. Fisher, Richard E. Mayer, Joseph D. DeCaprio, Ronald K. Nilsen