Patents by Inventor Lakshmi Putcha

Lakshmi Putcha 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).

  • Preservation of liquid biological samples
    Patent number: 6716392
    Abstract: The present invention relates to the preservation of a liquid biological sample. The biological sample is exposed to a preservative containing at least about 0.15 g of sodium benzoate and at least about 0.025 g of citric acid per 100 ml of sample. The biological sample may be collected in a vessel or an absorbent mass. The biological sample may also be exposed to a substrate and/or a vehicle.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: April 6, 2004
    Assignee: The United States of America as represented by the United States National Aeronautics and Space Administration
    Inventors: Lakshmi Putcha, Ramalingeshwara R. Nimmagudda
  • Preservation of liquid biological samples
    Patent number: 6133036
    Abstract: The present invention provides a method of preserving a liquid biological sample, comprising the step of: contacting said liquid biological sample with a preservative comprising: sodium benzoate in an amount of at least about 0.15% of the sample (weight/volume); and citric acid in an amount of at least about 0.025% of the sample (weight/volume).
    Type: Grant
    Filed: January 14, 1998
    Date of Patent: October 17, 2000
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Lakshmi Putcha, Ramalingeshwara R. Nimmagudda