Patents by Inventor Gerhard Maeker

Gerhard Maeker 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).

  • Isopropenyl ester sized paper and method for producing same
    Patent number: 4152198
    Abstract: Paper and paperboard made of felted cellulose fibers are chemically modified by applying to them an isopropenyl ester containing a catalytic amount of an acid catalyst and then heat curing the treated product. The process imparts water repellancy to the paper products with a very low degree of add-on, but with a very high degree of retention of tensile strength. The products also have excellent printability, are resistant to boiling water, and retain their opacity after exposure to water.
    Type: Grant
    Filed: February 15, 1978
    Date of Patent: May 1, 1979
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Samuel Serota, Leonard S. Silbert, Gerhard Maeker