Patents by Inventor Raja Roy

Raja Roy 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).

  • Production of high purity silicon from amorphous silica
    Patent number: 8337795
    Abstract: A process to the production of silicon from amorphous silica is disclosed. The amorphous silica is formed from a material rich in silica, especially rice husk ash or silica fume. The process comprises subjecting the amorphous silica to leaching with a lixiviant of aqueous mineral acid, especially hydrochloric acid. Preferably, material rich in silica is roasted at a temperature of not more than 850° C., subjected to leaching and then subjected to a second roasting at a temperature of less than 750° C. The process provides for the production of high purity silicon, especially to the production of solar grade silicon (SoG-Si).
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: December 25, 2012
    Assignee: Process Research Ortech Inc.
    Inventors: Mansoor Barati, Kingsley Kweku Larbi, Raja Roy, Vaikuntam I. Lakshmanan, Ramamritham Sridhar
  • PRODUCTION OF HIGH PURITY SILICON FROM AMORPHOUS SILICA
    Publication number: 20120230904
    Abstract: A process to the production of silicon from amorphous silica is disclosed. The amorphous silica is formed from a material rich in silica, especially rice husk ash or silica fume. The process comprises subjecting the amorphous silica to leaching with a lixiviant of aqueous mineral acid, especially hydrochloric acid. Preferably, material rich in silica is roasted at a temperature of not more than 850° C., subjected to leaching and then subjected to a second roasting at a temperature of less than 750° C. The process provides for the production of high purity silicon, especially to the production of solar grade silicon (SoG-Si).
    Type: Application
    Filed: August 25, 2010
    Publication date: September 13, 2012
    Inventors: Mansoor Barati, Kingsley Kweku Larbi, Raja Roy, Vaikuntam I. Lakshmanan, Ramamritham Sridhar
  • Production of High Purity Silicon from Amorphous Silica
    Publication number: 20110052475
    Abstract: A process to the production of silicon from amorphous silica is disclosed. The amorphous silica is formed from a material rich in silica, especially rice husk ash or silica fume. The process comprises subjecting the amorphous silica to leaching with a lixiviant of aqueous mineral acid, especially hydrochloric acid. Preferably, material rich in silica is roasted at a temperature of not more than 850° C., subjected to leaching and then subjected to a second roasting at a temperature of less than 750° C. The process provides for the production of high purity silicon, especially to the production of solar grade silicon (SoG-Si).
    Type: Application
    Filed: August 25, 2010
    Publication date: March 3, 2011
    Inventors: Mansoor Barati, Kingsley Kweku Larbi, Raja Roy, Vaikuntam I. Lakshmanan, Ramamritham Sridhar
  • Isolation of tigogenin pentaglycoside from
    Patent number: 7160866
    Abstract: The present invention provides a novel saponin tigogenin penta glycoside isolated from the aerial parts of Chlorophytum nimonii and a process for the isolation thereof as well as its use in anti-hyperglycemic and hypolipidemic activities.
    Type: Grant
    Filed: March 22, 2004
    Date of Patent: January 9, 2007
    Assignee: Council of Scientific and Industrial Research
    Inventors: Lakshmi Vijay, Kartikay Pandey, Raja Roy, Bhawani Shankar Joshi, Padmanabhan Madhusudanan Kunnath, Ramesh Chandra, Arvind Kumar Srivastava, Deepak Raina, Anil Kumar Rastogi
  • Isolation of tigogenin pentaglycoside from chlorophytum nimonii
    Publication number: 20050209168
    Abstract: The present invention provides a novel saponin tigogenin penta glycoside isolated from the aerial parts of Chlorophytum nimonii and a process for the isolation thereof as well as its use in anti-hyperglycemic and hypolipidemic activities.
    Type: Application
    Filed: March 22, 2004
    Publication date: September 22, 2005
    Inventors: Lakshmi Vijay, Kartikay Pandey, Raja Roy, Bhawani Joshi, Padmanabhan Kunnath, Ramesh Chandra, Arvind Srivastava, Deepak Raina, Anil Rastogi