Patents by Inventor Robert Clayton Wheland

Robert Clayton Wheland 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).

  • Solutions of fluoropolymers in carbon dioxide
    Patent number: 6034170
    Abstract: Fluoropolymers containing a specified ratio of hydrogen to fluorine atoms attached to polymer backbone atoms dissolve in carbon dioxide under relatively mild conditions of temperature and pressure. The resulting solutions may be used for coatings or encapsulation.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: March 7, 2000
    Assignees: E. I. du Pont de Nemours and Company, Johns Hopkins University
    Inventors: William Howard Tuminello, Mark A. McHugh, Robert Clayton Wheland, Gregory Thomas Dee
  • Process for preparing peroxides
    Patent number: 5962746
    Abstract: A process for the faster manufacturing of hydrocarbon, fluorocarbon and chlorocarbon acyl peroxides is disclosed wherein a hydroxide, a peroxide and an acyl halide are reacted under continuous vigorous agitation conditions so as to bring the reaction to substantial completion is less than one minute.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: October 5, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: George Francis Diffendall, Thomas William Harding, Joseph Norman Hockman, Carl George Krespan, Matthew John Targett, Robert Clayton Wheland
  • Fluorescent fluoroplastics
    Patent number: 5888424
    Abstract: Fluoroplastics become identifiable as to source by incorporating 1 to 450 ppm of inorganic phosphor into the fluoroplastic which does not degrade the fluoroplastic upon processing at a temperature of 300.degree. C. and does not discolor the fluoroplastic but does emit radiation which is characteristic of the phosphor when the fluoroplastic is exposed to excitation radiation.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: March 30, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Sina Ebnesajjad, Vadim Leonidovitch Lichtchinski, Carmine Torardi, Robert Clayton Wheland
  • Process for preparing peroxides
    Patent number: 5831131
    Abstract: A process for the faster manufacturing of hydrocarbon, fluorocarbon and chlorocarbon acyl peroxides is disclosed wherein a hydroxide, a peroxide and an acyl halide are reacted under continuous vigorous agitation conditions so as to bring the reaction to substantial completion is less than one minute.
    Type: Grant
    Filed: August 26, 1996
    Date of Patent: November 3, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl George Krespan, Robert Clayton Wheland
  • Amorphous tetrafluoroethylene-hexafluoropropylene copolymers
    Patent number: 5663255
    Abstract: Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) copolymers, which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.
    Type: Grant
    Filed: October 27, 1995
    Date of Patent: September 2, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Colin Anolick, Robert Clayton Wheland
  • Process for making fluoropolymers
    Patent number: 5639837
    Abstract: Disclosed herein is a process in which fluorine containing olefins are polymerized using an initiation system which is a combination of a fluoroaliphatic sulfinate or sulfinic acid and chlorate, bromate or hypochlorite ions. The resulting polymer contains fewer deleterious end groups and is more stable and/or easier to process. The polymers produced are useful as thermoplastics and elastomers.
    Type: Grant
    Filed: June 4, 1996
    Date of Patent: June 17, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William Brown Farnham, Andrew Edward Feiring, Bruce Edmund Smart, Robert Clayton Wheland