Patents by Inventor Irwin Spiess

Irwin Spiess 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).

  • Use of ultrasonic energy to improve nitrocellulose purification
    Patent number: 4388458
    Abstract: The instant invention relates to a process for removing trace sulfuric acid rom nitrocellulose fibers by dispersing the fibers in water and then subjecting them to ultrasonic energy for a time period and at an energy level sufficient to enhance the nitrocellulose fibers contact with water and facilitate sulfuric acid dispersal in the water. The waste water containing the traces of sulfuric acid contaminant from the nitrocellulose fibers is removed and the purified nitrocellulose fibers recovered.
    Type: Grant
    Filed: December 24, 1981
    Date of Patent: June 14, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Robert P. Baumann, Marcel Blais, Irwin Spiess
  • Nitration of cellulose
    Patent number: 4365059
    Abstract: There is disclosed a process for the nitration of cellulose with nitric acid in the absence of sulfuric acid which comprises adding sufficient nitric oxide and oxygen or air to the nitration reaction mixture to react with the water formed in the reaction. This regenerates nitric acid which can be recycled to the reaction or removed and collected.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: December 21, 1982
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Robert P. Baumann, Marcel Blais, Irwin Spiess