Patents by Inventor Theodore Duncan

Theodore Duncan 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: 9624323
    Abstract: The present disclosure provides a process. In an embodiment, the process includes producing a propylene-based polymer in a gas-phase polymerization reactor (10) under polymerization conditions. The polymerization conditions include a combined propylene-plus-propane partial pressure from 290 psia to 450 psia. The process further includes maintaining the combined propylene-plus-propane partial pressure in the range from 290 psia to 450 psia while simultaneously: (i) reducing propylene partial pressure in the gas-phase polymerization reactor; (ii) adding propane to the gas-phase polymerization reactor; (iii) introducing at least one C4-C10 comonomer into the gas-phase polymerization reactor (26); and forming a propylene/C4-C10 interpolymer in the gas-phase polymerization reactor (44).
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: April 18, 2017
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Sharon E. Peterson, Mark W. Blood, Theodore Duncan
  • Publication number: 20160032031
    Abstract: The present disclosure provides a process. In an embodiment, the process includes producing a propylene-based polymer in a gas-phase polymerization reactor (10) under polymerization conditions. The polymerization conditions include a combined propylene-plus-propane partial pressure from 290 psia to 450 psia. The process further includes maintaining the combined propylene-plus-propane partial pressure in the range from 290 psia to 450 psia while simultaneously: (i) reducing propylene partial pressure in the gas-phase polymerization reactor; (ii) adding propane to the gas-phase polymerization reactor; (iii) introducing at least one C4-C10 comonomer into the gas-phase polymerization reactor (26); and forming a propylene/C4-C10 interpolymer in the gas-phase polymerization reactor (44).
    Type: Application
    Filed: March 13, 2014
    Publication date: February 4, 2016
    Applicant: W.R. Grace & Co. - Conn.
    Inventors: Sharon Peterson, Mark W. Blood, Theodore Duncan
  • Patent number: 4376441
    Abstract: An applicator for applying hair treatment preparations to a person's hair and for rinsing the preparation from the hair. The applicator is a compact device which includes a remotely located heater/blower unit coupled to a hand-held applicator assembly. The applicator assembly includes a chamber for receipt of a viscous hair treatment preparation and a plurality of apertured projections which communicate with the chamber. A stream of heated air is provided into the chamber, to melt the preparation. The melted preparation flows from the chamber, through the apertures and onto the person's hair. The projections function as comb teeth to spread the preparation through the hair. The applicator assembly can be connected to a water tap, for water to flow through the apertures of the applicator assembly so the preparation may simultaneously be rinsed and combed from a person's hair. The preferred embodiment of the invention includes a removable scoop and capsule member.
    Type: Grant
    Filed: October 14, 1980
    Date of Patent: March 15, 1983
    Inventor: Theodore Duncan