Patents by Inventor Mari Aikawa

Mari Aikawa 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 preparing high-purity elemental phosphorus and method for preparing high-purity phosphoric acid
    Patent number: 8747792
    Abstract: Provided is a method for preparing high-purity elemental phosphorus capable of simultaneously reducing both arsenic and antimony from crude white phosphorus containing a great amount of arsenic and antimony as impurities. Provided is a method for preparing high-purity elemental phosphorus, the method including bringing liquid crude white phosphorus into contact with an iodic acid-containing compound selected from iodic acid and iodates in an aqueous solvent in the presence of a chelating agent, wherein the chelating agent is selected from polyvalent carboxylic acids, polyvalent carboxylates, phosphonic acid and phosphonates.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: June 10, 2014
    Assignee: Nippon Chemical Industrial Co., Ltd.
    Inventors: Yutaka Kinose, Toru Hata, Mari Aikawa
  • METHOD FOR PREPARING HIGH-PURITY ELEMENTAL PHOSPHORUS AND METHOD FOR PREPARING HIGH-PURITY PHOSPHORIC ACID
    Publication number: 20120009112
    Abstract: Provided is a method for preparing high-purity elemental phosphorus capable of simultaneously reducing both arsenic and antimony from crude white phosphorus containing a great amount of arsenic and antimony as impurities. Provided is a method for preparing high-purity elemental phosphorus, the method including bringing liquid crude white phosphorus into contact with an iodic acid-containing compound selected from iodic acid and iodates in an aqueous solvent in the presence of a chelating agent, wherein the chelating agent is selected from polyvalent carboxylic acids, polyvalent carboxylates, phosphonic acid and phosphonates.
    Type: Application
    Filed: July 11, 2011
    Publication date: January 12, 2012
    Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.
    Inventors: Yutaka Kinose, Toru Hata, Mari Aikawa