Patents by Inventor Hajima Hiratani

Hajima Hiratani 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).

  • Novel erythropoietin product and method for the preparation thereof
    Patent number: 4397840
    Abstract: The invention provides a novel erythropoietin product prepared from the urine of healthy human but exhibiting no inhibitory effect against erythropoiesis as is the most disadvantageous problem in the product prepared from the urine of healthy human. The method for the preparation of such a product comprises adsorbing the crude erythropoietin product obtained from the urine of healthy human on to a weakly basic anion exchanger from a neutral or weakly acidic aqueous solution containing 0.1 to 0.2 mole per liter of an inorganic neutral salt such as sodium chloride and then eluting the thus adsorbed ingredients with an aqueous eluant solution containing from 0.5 to 0.7 mole per liter of an inorganic neutral salt.
    Type: Grant
    Filed: March 3, 1982
    Date of Patent: August 9, 1983
    Assignees: Ajinomoto Co., Inc., Japan Chemical Research Co., Ltd.
    Inventors: Kenji Takezawa, Hajima Hiratani