Patents by Inventor Bharath Rajappa

Bharath Rajappa 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).

  • Sulfates and phosphates as allosteric effectors in mannanohydrolase enzyme breakers
    Patent number: 8833457
    Abstract: The allosteric effectors, sulfate and phosphate, can be used with mannanohydrolase enzymes to better control the break of gelled fracturing fluids in wellbore operations. The fracturing fluid contains a hydratable polymer of guar, a guar derivative, a cellulose derivative, a water soluble biopolymer or a combination thereof and a crosslinking agent. The mannanohydrolase enzyme catalyzes the hydrolysis of ?-(1,4) mannosidic linkages to break the polymeric backbone.
    Type: Grant
    Filed: March 8, 2011
    Date of Patent: September 16, 2014
    Assignee: Baker Hughes Incorporated
    Inventors: Charles David Armstrong, Hoang Le, Bharath Rajappa, Qi Qu
  • Sulfates and Phosphates as Allosteric Effectors in Mannanohydrolase Enzyme Breakers
    Publication number: 20120227971
    Abstract: The allosteric effectors, sulfate and phosphate, can be used with mannanohydrolase enzymes to better control the break of gelled fracturing fluids in wellbore operations.
    Type: Application
    Filed: March 8, 2011
    Publication date: September 13, 2012
    Inventors: Charles David Armstrong, Hoang Le, Bharath Rajappa, Qi Qu