Patents by Inventor Sabyasachi Sinha Ray

Sabyasachi Sinha Ray 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).

  • Oligomerization of alpha-olefins
    Patent number: 6184429
    Abstract: This invention relates to a catalyst composition capable of effecting selective oligomerisation of olefins contained in cracked refinery distillate streams, comprising of olefins, aromatics, paraffins and cycloparaffins. The catalyst composition gives very high conversion of olefins to poly olefins, which after distillation and stabilization by hydrogenation affords lubricating oil base stocks. The catalyst composition comprises of an aluminum halide and a transition metal alkoxide belonging to group IVB.
    Type: Grant
    Filed: July 16, 1999
    Date of Patent: February 6, 2001
    Assignee: The Indian Oil Corporation Ltd.
    Inventors: Rakesh Sarin, Sabyasachi Sinha Ray, Deepak Kumar Tuli, Madan Mohan Rai, Sobhan Ghosh, Akhilesh Kumar Bhatnagar
  • Process for the preparation of supported aluminium chloride catalyst containing organo aluminium compound
    Patent number: 6096678
    Abstract: A process for the preparation of an inert oxide supported metal halide organo aluminium compound catalyst. The catalyst is obtained by reacting an activated support having surface hydroxyl groups with aluminium chloride selected from aluminium chloride solution and aluminium chloride vapors. A solution of an aluminium alkyl is added to the reacted support. The solvent is removed and the reacted support is dried.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: August 1, 2000
    Inventors: Sabyasachi Sinha Ray, Rakesh Sarin, Deepak Kumar Tuli, Madan Mohan Rai, Sobhan Ghosh, Akhilesh Kumar Bhatnagar, Swaminathan Sivaram, Thekke Pangil Mohandas, Dattatraya Haribhau Gholap, Mallinamadugu Jogimarappa Gari Yanjarappa
  • Process for preparation of a heterogeneous catalyst useful for preparation of super high molecular weight polymers of alpha-olefin
    Patent number: 6015768
    Abstract: A process for the preparation of heterogeneous zirconium based catalyst for polymerization of alpha-olefins to super high molecular weight poly (alpha-olefins). The process comprises in mixing zirconium alcholate or phenolate with anhydrous magnesium chloride in the presence of a solvent. The mixture is heated, then cooled and an organoaluminum compound is added. Optionally, an electron donor compound is added and heated to obtain a black slurry, which is cooled and then washed with a hydrocarbon diluent.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: January 18, 2000
    Inventors: Sabyasachi Sinha Ray, Deepak Kumar Tuli, Meeta Sharma, Madan Mohan Rai, Sobhan Ghosh, Akhilesh Kumar Bhatnagar, Prabhat Kumar Saxena, Swaminathan Sivaram
  • Process for oligomerisation of alpha-olefins
    Patent number: 6002060
    Abstract: A process for the oligomerization and co-oligomerization of alpha olefins by subjecting olefins to the step of oligomerization in the presence of a supported aluminum chloride catalyst and an organoaluminum compound as a promoter. The catalyst is separated and the reaction product is subjected to the step of fractional distillation for removal of the solvent. The oligomers are further fractionated to obtain poly alpha olefins.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: December 14, 1999
    Inventors: Rakesh Sarin, Sabyasachi Sinha Ray, Deepak Kumar Tuli, Madan Mohan Rai, Sobhan Ghosh, Akhilesh Kumar Bhatnagar, Swaminathan Sivaram, Thekke Pangil Mohandas, Dattatraya Haribhau Gholap, Mallinamadugu Jogimarappa Gari Yanjarappa
  • Catalyst for oligomerization of alpha-olefins
    Patent number: 5922636
    Abstract: A catalyst composition for use in oligomerization of olefins contained in refinery distillate streams including paraffins, naphthenes, and aromatics therein, the catalyst consisting of a first constituent which is at least one aluminum halide; and a second constituent which is at least one alkoxide of a transition metal of Group IVB of the Periodic Table and which has a general formula:M(OR).sub.4,where M is selected from the group consisting of metals of Group IVB of the Periodic Table and R is one of (a) an alkyl group having from 1-12 carbon atoms or (b) an alkylaryl group having an alkyl chain having from 1-12 carbon atoms.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: July 13, 1999
    Inventors: Rakesh Sarin, Sabyasachi Sinha Ray, Deepak Kumar Tuli, Madan Mohan Rai, Sobhan Ghosh, Akhilesh Kumar Bhatnagar
  • Process for the preparation of synthetic lubricant base stocks
    Patent number: 5714661
    Abstract: A process for the preparation of oligomers which are used in synthetic lubricant base stocks. The oligomers are prepared by contacting a mixture of linear olefins and n-paraffins contained in cracked refinery streams having 6 to 24 carbon atoms with activated Y-zeolites. The oligomers and unreacted monomers are subjected to the step of hydrogenation and the lower saturated paraffins are separated therefrom to produce synthetic lubricant base stock.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: February 3, 1998
    Inventors: Deepak Kumar Tuli, Sabyasachi Sinha Ray, Rakesh Sarin, Madan Mohan Rai, Sobhan Ghosh, Akhilesh Kumar Bhatnagar