Patents by Inventor Paul Frank D'Angelo

Paul Frank D'Angelo 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).

  • N-acylaminoalkane sulfonate and amphoteric surfactant blends and methods for preparing the same
    Patent number: 6057463
    Abstract: Blends of N-acyl aminoalkane sulfonates and amphoteric and/or anionic surfactants can be prepared by quenching a molten reaction mixture of an aminoalkane sulfonate amidated with a fatty acid with an aqueous solution comprising an amphoteric and/or anionic surfactant.N--acyl aminoalkane sulfonates can be purified by quenching a molten reaction mixture in isopropanol.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: May 2, 2000
    Assignee: Rhodia Inc.
    Inventors: David James Tracy, Paul Frank D'Angelo
  • Acyloxyalkane sulfonate and amphoteric surfactant blend compositions and methods for preparing same
    Patent number: 5837668
    Abstract: A process for preparing blends or slurries of acyloxyalkane sulfonate salts is provided. The salts have the formula:R.sub.1 C(O)O(CH.sub.2).sub.n SO.sub.3 Ywherein R.sub.1 is a hydrocarbyl radical having from about 6 to about 26 carbon atoms, n is an integer of from 2 to 4 and Y is an alkali metal or alkaline earth metal. The blend also comprises an amphoteric and/or anionic surfactant. The first step of the process comprises acylating an alkane sulfonic acid with a fatty acid at a temperature above about 180.degree. C. forming a molten reaction mass of acyloxyalkane sulfonate salts. In the next step, the molten reaction mass is quenched in an aqueous quench liquid comprising an amphoteric and/or anionic surfactant. Finally, a blend comprising an acyloxyalkane sulfonate and an amphoteric and/or anionic surfactant is recovered.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: November 17, 1998
    Assignee: Rhodia Inc.
    Inventors: David James Tracy, Paul Frank D'Angelo