Patents by Inventor John F. Neumer

John F. Neumer 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).

  • Preparation and purification of poly(tetramethylene ether) formal glycols and poly(oxybutylene formal) glycols
    Patent number: 5254744
    Abstract: Oligomeric formal diols are prepared by coupling segments of poly(tetramethylene ether) glycols, each having a molecular weight of 650-3000, with formaldehyde in the presence of a granular acidic catalyst, to yield poly(tetramethylene ether) formal glycols of 1,400-12,000 molecular weight.Oligomeric formal diols of a second type can also be prepared by coupling with formaldehyde segments of poly(tetramethylene ether) glycols mixed with segments of other polymeric glycols, as for example polyethylene oxide glycol of 200 molecular weight, to yield poly(ether formal) glycols of substantially higher molecular weight than either of the starting polyether glycols, and having properties significantly different from the parent polyether glycols that may affect the performance as soft or elastomeric segments of derived polyurethanes, polyetheresters, and polyureas.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: October 19, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John F. Neumer