Patents by Inventor Constance Wright Alegranti

Constance Wright Alegranti 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: 4113628
    Abstract: Asymmetric polyimide membranes are prepared from tetracarboxylic acid dianhydrides and diamines. They are semipermeable and useful in the separation of different chemical species by osmosis, dialysis, electrodialysis and reverse osmosis.
    Type: Grant
    Filed: April 15, 1976
    Date of Patent: September 12, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Constance Wright Alegranti