Patents by Inventor Biswajit Das

Biswajit Das 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).

  • Publication number: 20090075916
    Abstract: This invention relates to 14-membered macrolide derivatives for treating or preventing acne vulgaris and associated inflammatory conditions. Also provided herein are medicaments or pharmaceutical compositions comprising one or more 14-membered macrolide derivatives together with one or more pharmaceutically acceptable carriers, excipients, diluents or mixture thereof, and methods for treating or preventing acne vulgaris and associated inflammatory conditions.
    Type: Application
    Filed: November 22, 2006
    Publication date: March 19, 2009
    Inventors: Dilip J. Upadhyay, Anjan Chakrabarti, Biswajit Das, Radhakrishnan Gowrishankar
  • Publication number: 20090047427
    Abstract: A system and method A method of growing an elongate nanoelement from a growth surface includes: a) cleaning a growth surface on a base element; b) providing an ultrahigh vacuum reaction environment over the cleaned growth surface; c) generating a reactive gas of an atomic material to be used in forming the nanoelement; d) projecting a stream of the reactive gas at the growth surface within the reactive environment while maintaining a vacuum of at most 1×10?4 Pascal; e) growing the elongate nanoelement from the growth surface within the environment while maintaining the pressure of step c); f) after a desired length of nanoelement is attained within the environment, stopping direction of reactive gas into the environment; and g) returning the environment to an ultrahigh vacuum condition.
    Type: Application
    Filed: August 13, 2008
    Publication date: February 19, 2009
    Inventors: Biswajit Das, Myung B. Lee
  • Publication number: 20090018174
    Abstract: Provided herein are macrolide derivatives that can be useful in treating or preventing inflammatory diseases. Also provided are pharmaceutical compositions comprising one or more macrolide derivatives optionally together with one or more pharmaceutically acceptable carriers, excipients, diluents or mixtures thereof, as well as methods for treating or preventing inflammatory diseases.
    Type: Application
    Filed: November 8, 2006
    Publication date: January 15, 2009
    Inventors: Pradip Kumar Bhatnagar, Anjan Chakrabarti, Biswajit Das, Malini Bajpai, Abhijit Ray
  • Publication number: 20080318878
    Abstract: The present invention provides acylide derivatives, which can be used as antibacterial agents. Compounds disclosed herein can be used for treating or preventing conditions caused by or contributed to by Gram-positive, Gram-negative or anaerobic bacteria, more particularly against, for example, Staphylococci, Streptococci, Enterococci, Haemophilus, Moraxalla spp., Chlamydia spp., Mycoplasm, Legionella spp., Mycobacterium, Helicobacter, Clostridium, Bacteroides, Corynebacterium, Bacillus, Enterobactericeae or any combination thereof. Also provided are processes for preparing compounds disclosed herein, pharmaceutical compositions thereof, and method of treating bacterial infections.
    Type: Application
    Filed: September 27, 2005
    Publication date: December 25, 2008
    Inventors: Biswajit Das, Rita Katoch, Atul Kashinath Hajare, Anish Bandyopadhyay, Santosh Haribhau Kurhade, Sujata Rathy, Ashok Rattan
  • Publication number: 20080292870
    Abstract: Methods, apparatus and systems form structures from nanoparticles by: providing a source of nanoparticles, the particles being capable of being moved by application of a field, such as an electrical field, magnetic field and even electromagnetic radiation or fields such as light, UV IR, radiowaves, radiation and the like; depositing the nanoparticles to a surface in a first distribution of the nanoparticles; applying a field to the nanoparticles on the surface that applies a force to the particles; and rearranging the nanoparticles on the surface by the force from the field to form a second distribution of nanoparticles on the surface. The second distribution of nanoparticles is more ordered or more patterned than the first distribution of nanoparticles as a result of the rearranging.
    Type: Application
    Filed: August 1, 2007
    Publication date: November 27, 2008
    Inventor: Biswajit Das
  • Publication number: 20080287376
    Abstract: The present invention provides ketolide derivatives, which can be used as antibacterial agents. In particular, compounds described herein can be used for treating or preventing conditions caused by or contributed to by Gram-positive, Gram-negative or anaerobic bacteria, more particularly against, for example, Staphylococci, Streptococci, Enterococci, Haemophilus, Moraxalla spp. Chlamydia spp., Mycoplasm, Legionella spp., Mycobacterium, Helicobacter, Clostridium, Bacteroides, Corynebaclerium, Bacillus or Enterobactericeae. Also provided are processes for preparing such ketolide derivatives, pharmaceutical compositions thereof, and methods of treating bacterial infections.
    Type: Application
    Filed: July 28, 2005
    Publication date: November 20, 2008
    Applicants: RANBAXY LABORATORIES LIMITED
    Inventors: Biswajit Das, Mohammad Salman, Atul Kashinath Hajare, Ramadass Venkataramanan, Rita Katoch, Rajesh Kumar, Gobind Singh Kapkoti, Anjan Chakrabarti, Anish Bandyopadhyay, Santosh Haribhau Kurhade, Yogesh Baban Surase, Ashok Rattan
  • Publication number: 20080230826
    Abstract: Methods, apparatus and systems form memory structures, such as flash memory structures from nanoparticles by providing a source of nanoparticles as a conductive layer. The particles are moved by application of a field, such as an electrical field, magnetic field and even electromagnetic radiation. The nanoparticles are deposited onto an insulating surface over a transistor in a first distribution of the nanoparticles. A field is applied to the nanoparticles on the surface that applies a force to the particles, rearranging the nanoparticles on the surface by the force from the field to form a second distribution of nanoparticles on the surface. A protective and enclosing insulating layer is deposited on the nanoparticle second distribution. The addition of a top conductive layer completes a basic flash memory structure.
    Type: Application
    Filed: March 12, 2008
    Publication date: September 25, 2008
    Applicants: Nevada
    Inventor: Biswajit Das
  • Publication number: 20080207536
    Abstract: The present invention provides acylide derivatives, which can be used as antibacterial agents. Compounds disclosed herein can be used for the treatment or prevention of a condition caused by or contributed to by Gram-positive, Gram-negative or anaerobic bacteria, more particularly against bacterium such as Staphylococci, Streptococci, Enterococci, Haemophilus, Moraxalla spp., Chlamydia spp., Mycoplasm, Legionella spp., Myobacterium, Helicobacter, Clostridium, Bacteroides, Corynebacterium, Baccillus or Enterobactericeae. Processes for the preparation of disclosed compounds, pharmaceutical compositions thereof, and method of treating bacterial infections, are also provided.
    Type: Application
    Filed: July 13, 2005
    Publication date: August 28, 2008
    Applicant: RANBAXY LABORATORIES LIMITED
    Inventors: Biswajit Das, Rita Katoch, Atul Kashinath Hajare, Gobind Singh Kapkoti, Anish Bandyopadhyay, Ramadass Venkataramanan, Rajesh Kumar, Santosh Haribhau Kurhade, Sujata Rathy, Anjan Chakrabarti, Yogesh Baban Surase, Mohammad Salman, Ashok Rattan
  • Publication number: 20080188470
    Abstract: Provided herein are novel substituted phenyl oxazolidinones and to processes for the synthesis thereof. Also provided are pharmaceutical compositions comprising one or more compounds described herein The compounds described can be useful antimicrobial agents, which can be effective against a number of human and veterinary pathogens, including gram-positive aerobic bacteria such as multiple-resistant staphylococci, streptococci and enterococci, as well as, anaerobic organisms, such as Bacterioides spp. and Clostridia spp. species, and acid fast organisms, such as Mycobacterium tuberculosis, Mycobacterium avium and Mycobacterium spp.
    Type: Application
    Filed: April 12, 2006
    Publication date: August 7, 2008
    Applicant: RANBAXY LABORATORIES LIMITED
    Inventors: Biswajit Das, Sonali Rudra, Sangita Sangita, Mohammad Salman, Ashok Rattan
  • Publication number: 20070270484
    Abstract: This invention generally relates to macrolides, more particularly, the invention relates to 3-N-substituted-3-O-substituted erythronolide A derivatives, which are antibacterial agents effective against gram positive or gram negative bacteria and atypical pathogens. The compounds of this invention are more particularly effective against Staphylococcus aureus, Streptococcus pneumoniae, Enterococcus faecalis, Escherichia coli, Pseudomonas aeruginosa, Haemophilus influenzae. The invention also relates to a process for the preparation of the compounds of the present invention, pharmaceutical compositions containing the compounds of the present invention and the methods for treating bacterial infection.
    Type: Application
    Filed: September 25, 2003
    Publication date: November 22, 2007
    Inventors: Biswajit Das, Mohammad Salman, Sachin Shelke, Atul Hajare, Sanjay Talukdar, Sujata Rathy, Arani Pal, Ashok Rattan
  • Publication number: 20050209248
    Abstract: The invention relates to phenyl oxazolidinone derivatives. More particularly, it relates to polymorphic forms of (S)-N-[[3-fluoro-4-[N-1[4-{2-furyl-(5-nitro)methyl}]piperazinyl]-phenyl]-2-oxo-5-oxazolidinyl]-methyl]acetamide hydrochloride having the Formula I. Further, the invention relates to methods of using such compounds as antimicrobials, pharmaceutical compositions containing the novel polymorphic forms, and processes for the preparation of the polymorphic forms.
    Type: Application
    Filed: May 15, 2003
    Publication date: September 22, 2005
    Inventors: Biswajit Das, Anita Mehta, Ashok Rattan
  • Publication number: 20040242591
    Abstract: The present invention relates to certain substituted phenyl oxazolidinones and to processes for the synthesis of the same. This invention also relates to pharmaceutical compositions containing the compounds of the present invention as antimicrobials. The compounds are useful antimicrobial agents, effective against a number of human and veterinary pathogens, including gram-positive aerobic bacteria such as multiply-resistant staphylococci, streptococci and enterococci as well as anaerobic organisms such as Bacteroides spp. and Clostridium spp. species, and acid fast organisms such as Mycobacterium tuberculosis, Mycobacterium avium and Mycobacterium spp.
    Type: Application
    Filed: July 13, 2004
    Publication date: December 2, 2004
    Inventors: Anita Mehta, Sonali Rudra, Ajjarapu Venkata Subramanya Raja Rao, Biswajit Das, Abhijit Ray, Akella Satya Surya Visweswara Srinivas, Sudershan R. Arora, Ashok Rattan
  • Patent number: 6734307
    Abstract: The present invention relates to certain substituted phenyl oxazolidinones and to processes for the synthesis of the same. This invention also relates to pharmaceutical compositions containing the compounds of the present invention as antimicrobials. The compounds are useful antimicrobial agents, effective against a number of human and veterinary pathogens, including gram-positive aerobic bacteria such as multiply-resistant staphylococci, streptococci and enterococci as well as anaerobic organisms such as Bacterioides spp. and Clostridia spp. species, and acid fast organisms such as Mycobacterium tuberculosis, Mycobacterium avium and Mycobacterium spp.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: May 11, 2004
    Assignee: Ranbaxy Laboratories Limited
    Inventors: Anita Mehta, Arora K. Sudershan, Biswajit Das, Abhijit Ray, Sonali Rudra, Ashok Rattan
  • Publication number: 20030119817
    Abstract: The present invention relates to certain substituted phenyl oxazolidinones and to processes for the synthesis of the same. This invention also relates to pharmaceutical compositions containing the compounds of the present invention as antimicrobials. The compounds are useful antimicrobial agents, effective against a number of human and veterinary pathogens, including gram-positive aerobic bacteria such as multiply-resistant staphylococci, streptococci and enterococci as well as anaerobic organisms such as Bacterioides spp. and Clostridia spp. species, and acid fast organisms such as Mycobacterium tuberculosis, Mycobacterium avium and Mycobacterium spp.
    Type: Application
    Filed: January 17, 2002
    Publication date: June 26, 2003
    Inventors: Anita Mehta, Sudershan K. Arora, Biswajit Das, Abhijit Ray, Sonali Rudra, Ashok Rattan
  • Publication number: 20020103186
    Abstract: The present invention relates to certain substituted phenyl oxazolidinones and to processes for the synthesis of the same. This invention also relates to pharmaceutical compositions containing the compounds of the present invention as antimicrobials. The compounds are useful antimicrobial agents, effec number of human and veterinary pathogens, including gram-positive aerobic bacteria such as multiply-resistant staphylococci, streptococci and enterococci as well as anaerobic organisms such as Bacterioides spp. and Clostridia spp. species, and acid fast organisms such as Mycobacterium tuberculosis, Mycobacterium avium and Mycobacterium spp.
    Type: Application
    Filed: July 16, 2001
    Publication date: August 1, 2002
    Inventors: Anita Mehta, Sudershan K. Arora, Biswajit Das, Abhijit Ray, Sonali Rudra, Ashok Rattan