Patents by Inventor Nelson Samuel Marans

Nelson Samuel Marans 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).

  • Removal of unreacted tolylene diisocyanate from urethane prepolymers
    Patent number: 4061662
    Abstract: A process is described which is effective in removing unreacted tolylene diisocyanate (TDI) from a polyisocyanate by bringing said polyisocyanate into contact with molecular sieves.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: December 6, 1977
    Assignee: W. R. Grace & Co.
    Inventors: Nelson Samuel Marans, Alfred Gluecksmann
  • Biodegradable hydrophilic foams and method
    Patent number: 4049592
    Abstract: The invention disclosed is directed to biodegradable hydrophilic polyurethane structures prepared by using an isocyanate capped hydroxyester polyol reactant with large amounts of aqueous reactant. The resultant foam has economy in handling, and upon contact with liquids or body fluids, the foam is highly absorptive while being readily biodegradable after use.
    Type: Grant
    Filed: October 12, 1976
    Date of Patent: September 20, 1977
    Assignee: W. R. Grace & Co.
    Inventors: Nelson Samuel Marans, Alan Ricky Pollack
  • Flame retardant permanent press
    Patent number: 4045396
    Abstract: Fire retardancy and wrinkle resistance are imparted to cellulosic textiles by impregnation of said textiles with the phosphoalkylated reaction product of a polyisocyanate and an alkyleneamine.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: August 30, 1977
    Assignee: W. R. Grace & Co.
    Inventors: Nelson Samuel Marans, Alfred Gluecksmann
  • Inhibition of scale on saline water heat exchange surfaces with iminodiacetic acid compounds
    Patent number: 3981779
    Abstract: A method for decreasing fouling of metalliferous surfaces of apparatus wherein water is evaporated from an aqueous system containing components which deposit onto the surfaces as hydrophilic foulants. The method comprises adding to the aqueous system a chelant-surfactant having a hydrophobic moiety and a chelating moiety through which the chelant-surfactant chelates with the metalliferous surfaces and provides a hydrophobic barrier to deposition of hydrophilic foulants.
    Type: Grant
    Filed: August 1, 1974
    Date of Patent: September 21, 1976
    Assignee: W. R. Grace & Co.
    Inventors: Jacob Block, Nelson Samuel Marans