Patents by Inventor Robert W. Hudson

Robert W. Hudson 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).

  • Method for making polyphosphoric acid
    Patent number: 6616906
    Abstract: An improved method for making polyphosphoric acid from phosphoric acid includes the steps of introducing a first phosphoric acid feed stream into the top end of a packed column, introducing a second phosphoric acid feed stream into a stream of hot air to form a stream of hot air and acid, introducing the stream of hot air and acid into the bottom end of the column, and polymerizing phosphoric acid of the first and second phosphoric acid feed streams to make polyphosphoric acid. By-product phosphoric acids containing organic contaminants may be substituted for all or part of the phosphoric acid stream being introduced into the bottom end of the column to allow recovery of the phosphorus values of the by-product phosphoric acids.
    Type: Grant
    Filed: March 25, 2002
    Date of Patent: September 9, 2003
    Assignee: Rhodia Inc.
    Inventors: Dennis L. Myers, Robert W. Hudson, Nathan P. Mills, David Michael Razmus, Vincent Payen
  • Method for making polyphosphoric acid
    Publication number: 20030035768
    Abstract: An improved method for making polyphosphoric acid from phosphoric acid includes the steps of introducing a first phosphoric acid feed stream into the top end of a packed column, introducing a second phosphoric acid feed stream into a stream of hot air to form a stream of hot air and acid, introducing the stream of hot air and acid into the bottom end of the column, and polymerizing phosphoric acid of the first and second phosphoric acid feed streams to make polyphosphoric acid. By-product phosphoric acids containing organic contaminants may be substituted for all or part of the phosphoric acid stream being introduced into the bottom end of the column to allow recovery of the phosphorus values of the by-product phosphoric acids.
    Type: Application
    Filed: March 25, 2002
    Publication date: February 20, 2003
    Inventors: Dennis L. Myers, Robert W. Hudson, Nathan P. Mills, David Michael Razmus, Vincent Payen