Patents by Inventor Ajay Singh

Ajay Singh 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).

  • Biological process for breaking oil-water emulsions
    Patent number: 6171500
    Abstract: A process for breaking an oil-water emulsion. The process comprises contacting the oil-water emulsion with a bacterial culture produced by growth in a liquid medium containing hydrocarbons under non-sterile conditions. The oil-water emulsion and bacterial culture are contacted under conditions that minimise degradation of the oil. The oil-water emulsion is permitted to form an oil layer and a water layer, which are then separated. The process is particularly useful in the treatment of slop-oil emulsion in the petroleum industry.
    Type: Grant
    Filed: April 20, 1999
    Date of Patent: January 9, 2001
    Assignee: Petrozyme Technologies Inc.
    Inventors: Owen P. Ward, Ajay Singh
  • Treatment of soil contaminated with oil or oil residues
    Patent number: 6153017
    Abstract: A method for removal of hydrocarbon materials from solid particulate soil contaminated with the hydrocarbon materials. The method comprises forming an aqueous slurry of a mixture of a hydrophobic adsorbent selected from foamed synthetic materials or natural materials which entrap gas, with the soil in the presence of water. The adsorbent has a density less than water. The slurry is mixed for a period of time, and a gravity separation of the adsorbent from the aqueous admixture thus obtained is effected.
    Type: Grant
    Filed: January 28, 1999
    Date of Patent: November 28, 2000
    Assignee: Petrozyme Technologies Inc.
    Inventors: Owen P. Ward, Ajay Singh
  • Regiospecific process for synthesis of acyclic nucleosides
    Patent number: 6043364
    Abstract: N-7 isomer of the formula ##STR1## is converted into a N-9 isomer of the formula ##STR2## by heating a suspension of the N-7 isomer in an alkylating agent of the formula ##STR3##
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: March 28, 2000
    Assignee: Lupin Laboratories Limited
    Inventors: Ashoke Kumar, Dharmendra Singh, Mukesh Jagannath Wani, Narendra Sriram Joshi, Pravin Sahadev Thombre, Ajay Singh Rawat
  • Regiospecific process for synthesis of acyclic nucleosides
    Patent number: 5821367
    Abstract: This invention relates to an improved regiospecific process for the synthesis of acyclic nucleosides such as, acyclovir and ganciclovir, anti-viral compounds especially effective against herpes virus, and intermediates thereof starting from dyacylguanine and an alkylating agent, selected from 2-oxa-1,4-butanediol diacetate (OBDDA), 1,4-diacetoxy-3-acetoxymethyl-2-oxa-butane, 1,4-dibenzyloxy-3-acetoxymethyl-2-oxabutane. The reaction is carried out in the absence of an acid catalyst and a solvent.
    Type: Grant
    Filed: April 5, 1996
    Date of Patent: October 13, 1998
    Assignee: Lupin Laboratories Limited
    Inventors: Ashoke Kumar, Dharmendra Singh, Mukesh Jagannath Wani, Narendra Sriram Joshi, Pravin Sahadev Thombre, Ajay Singh Rawat