Patents by Inventor Richard L. Dreibelbis

Richard L. Dreibelbis 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).

  • Thin-walled articles of polyurethaneurea
    Patent number: 5391343
    Abstract: Certain polyether-based or polyester-based polyurethaneureas in solutions of organic solvent at a 12 to 20% concentration are particularly suited for use in a mandrel-dipping process for producing thin-walled elastic articles, such as surgical gloves, which are more resistant to puncture and tear than conventional surgical gloves made from rubber latex.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: February 21, 1995
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Richard L. Dreibelbis, Nathan E. Houser, Jacob Lahijani
  • Process for dry spinning spandex
    Patent number: 5362432
    Abstract: A process is provided for dry spinning a segmented polyurethaneurea at speeds as high as 900 meters/min. The process includes chain-extending an isocyanate-capped polyether glycol with a mixture of ethylenediamine and 1,2-diaminopropane, the 1,2-diaminopropane amounting to 8 to 17 mole % of the diamine mixture. The resultant spandex is particularly suited for use in women's hosiery.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: November 8, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Nathan E. Houser, Willem Bakker, Richard L. Dreibelbis
  • Spandex fiber with copolymer soft segment
    Patent number: 5000899
    Abstract: A elastic fibers are formed from spandex polymer that is prepared by reacting a glycol prepared from a tetrahydrofuran/3-methyltetrahydrofuran copolymer with a diisocyanate and then chain extending the thusly capped glycol with a particular mixture of diamines. The fibers have a highly desirable combination of power, hot-wet creep and heat-set efficiency and can be prepared at high spinning and windup speeds.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: March 19, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard L. Dreibelbis, Nathan E. Houser
  • Spinneret having groups of orifices with various interorifice spacing
    Patent number: 4679998
    Abstract: The conventional spandex spinneret has two rings of equally spaced grouped orifices, each filament being formed by coalescence of the extrudate from the grouped orifices. A spandex spinneret having the holes of the orifices of each group of the outer ring of groups more closely spaced than those of the inner ring of groups has eliminated the power differences between inner and outer threadlines. The closer spacing within each group of the outer ring of groups also increases the spacing between groups, thereby reducing filament migration.
    Type: Grant
    Filed: July 22, 1986
    Date of Patent: July 14, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard L. Dreibelbis, Oliver L. Hunt