Patents by Inventor Somnath Banerji

Somnath Banerji 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).

  • System and a process for obtaining high purity phenanthrene from phenanthrene enriched coal tar fraction
    Patent number: 7481908
    Abstract: The present invention relates to a system and a process for obtaining phenanthrene of about 95% purity from coal tar distilled fraction containing crude phenanthrene by performing fractional distillation at a reduced pressure of 50 mm mercury and at a temperature range of 160-180° C. to obtain first distilled fraction containing acenaphthene and fluorene; a second distillate fraction at a temperature range of 200-230° C. containing phenanthrene, anthracene and traces of carbazole; followed by re-distilling the second distillate fraction at a temperature range of 210-224° C. to finally obtain pure phenanthrene and a residue which is again used for the recovery of residual phenanthrene by re-distillation at a temperature range of 210-224° C.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: January 27, 2009
    Assignee: Council of Scientific & Industrial Research
    Inventors: Kaushal Kishore Tiwari, Sukuru Ramakrishna Rao, Sanjay Kumar Thakur, Somnath Banerji
  • System and a process for obtaining high purity phenanthrene from phenanthrene enriched coal tar fraction
    Publication number: 20030183499
    Abstract: The present invention relates to a system and a process for obtaining phenanthrene of about 95% purity from coal tar distilled fraction containing crude phenanthrene by performing fractional distillation at a reduced pressure of 50 mm mercury and at a temperature range of 160-180° C. to obtain first distilled fraction containing acenaphthene and fluorene; a second distillate fraction at a temperature range of 200-230° C. containing phenanthrene, anthracene and traces of carbazole; followed by re-distilling the second distillate fraction at a temperature range of 210-224° C. to finally obtain pure phenanthrene and a residue which is again used for the recovery of residual phenanthrene by re-distillation at a temperature range of 210-224° C.
    Type: Application
    Filed: March 26, 2002
    Publication date: October 2, 2003
    Inventors: Kaushal Kishore Tiwari, Sukuru Ramakrishna Rao, Sanjay Kumar Thakur, Somnath Banerji