Patents by Inventor Andrew Edward Feiring

Andrew Edward Feiring 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).

  • 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
  • Fluorination process
    Patent number: 4051168
    Abstract: Aromatic compounds containing an .alpha.-fluoroalkyl or .alpha.,.alpha.-difluoroalkyl side chain are prepared by reacting selected aromatic compounds with a mixture of HF and a metal oxide which is PbO.sub.2 or NiO.sub.2 at -30.degree. to +80.degree. C. Exemplary is the conversion of 4-nitrotoluene to 4-(fluoromethyl)nitrobenzene and 4-(difluoromethyl)nitrobenzene.
    Type: Grant
    Filed: May 12, 1976
    Date of Patent: September 27, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Andrew Edward Feiring