Patents by Inventor Ravindrakumar N. Raval

Ravindrakumar N. Raval 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).

  • Preventing solvent of crystallization in production of polyphosphite ligands
    Patent number: 10227365
    Abstract: Residual wash solvent, e.g., ethyl acetate, is removed from polyphosphite, e.g., bisphosphite, crystals by a process comprising the steps of: A. Mixing the polyphosphite crystals and residual wash solvent with a secondary alcohol, e.g., isopropyl alcohol (IPA), to form a mixture of polyphosphite crystals, residual wash solvent and secondary alcohol, and B. Drying the mixture to remove the residual wash solvent and secondary alcohol to a content of less than 0.5 wt % based on the weight of the polyphosphite crystals.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: March 12, 2019
    Assignee: Dow Technology Investments LLC
    Inventors: Glenn A. Miller, Pramod Dalvi, Ravindrakumar N. Raval
  • Preventing Solvent of Crystallization in Production of Polyphosphite Ligands
    Publication number: 20140288322
    Abstract: Residual wash solvent, e.g., ethyl acetate, is removed from polyphosphite, e.g., bisphosphite, crystals by a process comprising the steps of: A. Mixing the polyphosphite crystals and residual wash solvent with a secondary alcohol, e.g., isopropyl alcohol (IPA), to form a mixture of polyphosphite crystals, residual wash solvent and secondary alcohol, and B. Drying the mixture to remove the residual wash solvent and secondary alcohol to a content of less than 0.5 wt % based on the weight of the polyphosphite crystals.
    Type: Application
    Filed: October 25, 2012
    Publication date: September 25, 2014
    Inventors: Glenn A. Miller, Pramod Dalvi, Ravindrakumar N. Raval