Patents by Inventor Robert F. Schwenker, Jr.

Robert F. Schwenker, Jr. 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: 4200557
    Abstract: An insoluble etherified cellulose graft copolymer is provided comprising etherified cellulose which is soluble in water in the absence of grafting and is chosen from the group consisting of the alkali metal salts of carboxyalkyl cellulose, sulfoalkyl cellulose and phosphonoalkyl cellulose. The etherified cellulose has grafted onto its cellulose backbone side chains of polymer moieties in sufficient quantities to render the grafted etherified cellulose insoluble. The products of this invention are used alone or mixed with other absorbent materials such as unmodified cellulose, in the manufacture of absorbent napkins, tampons, sponges and the like.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: April 29, 1980
    Assignee: Personal Products Company
    Inventors: Pronoy K. Chatterjee, Robert F. Schwenker, Jr.