Patents by Inventor Roger C. Ayotte

Roger C. Ayotte 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).

  • Low phosphorus low color polyamides
    Patent number: 10865288
    Abstract: The present invention provides a low-phosphorus polyamide compound and a process for preparing such a polyamide.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: December 15, 2020
    Assignee: ASCEND PERFORMANCE MATERIALS OPERATIONS LLC
    Inventors: Steven C. Manning, Roger C. Ayotte
  • Low Phosphorus Low Color Polyamides
    Publication number: 20170107349
    Abstract: The present invention provides a low-phosphorus polyamide compound and a process for preparing such a polyamide.
    Type: Application
    Filed: March 19, 2015
    Publication date: April 20, 2017
    Applicant: Ascend Performance Materials Operations LLC
    Inventors: Steven C. Manning, Roger C. Ayotte
  • Process for the production of linear amorphous polyamides with excess diamine
    Patent number: 5245005
    Abstract: A process is disclosed for the production of linear amorphous polyamides which results in polyamides having more amine endgroups than acid endgroups. It comprises condensing an aqueous solution of salts comprising at least one aromatic diacid containing from 7 to 20 carbon atoms and a greater than equimolar amount of at least one aliphatic diamine containing from 4 to 20 carbon atoms.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: September 14, 1993
    Assignee: Monsanto Company
    Inventors: Chris E. Schwier, Richard D. Chapman, Roger C. Ayotte
  • Method for size exclusion chromatography
    Patent number: 5190658
    Abstract: An apparatus and a method for size exclusion chromatography is provided. The apparatus is a chromatographic column adapted for use in size exclusion chromatography by having dimensions suitable for size exclusion chromatography and by having a packing material comprising generally spherical particles having wedge-shaped macropores. Preferred particles are in the shape of lamellar and/or acicular crystals extending radially outwardly from a central core region and comprise aluminum oxide, aluminum hydroxide or a mixture thereof. The method involves passing a solution of macromolecules through a column adapted for size exclusion chromatography packed with such particles. The particles effectively and efficiently separate a wide range of macromolecules in decreasing order of their molecular weight.
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: March 2, 1993
    Assignee: Monsanto Company
    Inventors: Lev Z. Vilenchik, Roger C. Ayotte, Jawed Asrar, Christopher J. Hardiman