Patents by Inventor Richard Donnan Livingston

Richard Donnan Livingston 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).

  • Distillation apparatus
    Patent number: 4028443
    Abstract: A novel one-piece tray and matching supporting ring simplify the assembly of distillation columns having multiple plates. The trays and the openings in their supporting rings, which are attached to the inner wall of the column, are in the shape of a circle interrupted by two parallel chords, the tray width between the tray chords being smaller than the circular diameter of the ring opening.
    Type: Grant
    Filed: September 24, 1976
    Date of Patent: June 7, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard Donnan Livingston, Robert Dewey Sauerbrunn
  • Acid dyeable yarn from polyamide having N,N'-di (3-aminopropyl)piperazine moiety units
    Patent number: 3943095
    Abstract: Yarns of good color characterized by a high capability of being deeply dyed with acid dyes are spun from copolyamides having a relative viscosity of 35-75, an amine end concentration of 35-80 gram equivalents per 10.sup.6 grams of polymer and a defined content of units formed in part from N,N'-di(3-aminopropyl)piperazine and which have been produced with the introduction of a defined content of a specified organic phosphorous compound prior to extrusion of the polymer.
    Type: Grant
    Filed: September 26, 1974
    Date of Patent: March 9, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard Donnan Livingston