Patents by Inventor Ulla K. E. Helmer

Ulla K. E. Helmer 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).

  • Method and plant for separation of synthetic water soluble polymers
    Patent number: 5009789
    Abstract: Aqueous solutions of water soluble synthetic resins, such as urea-formaldehyde resins, are charged to an ultrafiltration membrane unit (2) for separation into a concentrate (C) solution and a permeate (P) solution. The permeate solution is recirculated to a polymerization reactor (1), preferably after first having been subjected to reverse osmosis for upgrading of the permeate. A plant for production and separation of synthetic water soluble resins comprises a polymerization reactor (1) and an ultrafiltration membrane unit (5) whereby the permeate outlet (P) of the ultrafiltration unit is connected with the polymerization reactor, preferably via a reverse osmosis unit (10).
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: April 23, 1991
    Assignee: EKA Nobel
    Inventors: Ulla K. E. Helmer, Karl-Erland M. Stensio