Patents by Inventor Koteswararao Rentala

Koteswararao Rentala 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).

  • Process for preparing zirconium phosphate
    Patent number: 4381289
    Abstract: Crystalline alpha zirconium phosphate Zr(HPO4).sub.2.H.sub.2 O, which can selectively remove ammonia and heavy metal ions from solution by ion exchange, is made by forming a room-temperature solution of zirconyl chloride ZrOCl.sub.2 in hydrochloric acid and adding sodium fluoride; the pH is now at most 1.6, the zirconium concentration is about 0.1M and the molar ratio sodium:zirconium is 5:1. Then, with rapid mixing, this composition is added to 15M phosphoric acid H.sub.3 PO.sub.4 (molar ratio phosphate:zirconium at least 3:1). Zirconium phosphate is precipitated.
    Type: Grant
    Filed: December 2, 1981
    Date of Patent: April 26, 1983
    Assignee: National Research Development Corporation
    Inventors: Derek V. Nowell, Koteswararao Rentala