Patents by Inventor Stephen M. Pulford

Stephen M. Pulford 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).

  • Water soluble linear polyethyleneimine derivative from water-insoluble polyethyleneimine, polyvinyl alcohol and aldehyde
    Patent number: 4614762
    Abstract: The present invention is directed to a high molecular weight, water soluble polymer product of polyethyleneimine, said product is formed by reacting a linear polyethylenimine with formaldehyde and a polyvinyl alcohol. The resultant product is useful as an improved drainage and retention aid in papermaking processes.
    Type: Grant
    Filed: June 15, 1984
    Date of Patent: September 30, 1986
    Assignee: W. R. Grace & Co.
    Inventors: Nelson S. Marans, Stephen M. Pulford