Patents by Inventor Rajendra K. Mehta

Rajendra K. Mehta 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).

  • Patent number: 4880675
    Abstract: The present invention is an improved plastic container having both improved thermal resistance and improved aroma and flavor barrier properties. The container comprises a polyethylene inner layer having a thickness in the range of 0.5 to 10.0 mil, and a coextruded polypropylene outer layer having a thickness such that the ratio of polypropylene to polylethylene is at least 2:1, and wherein the surface of the polyethylene layer has been treated with a reactive source of fluorine.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: November 14, 1989
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Rajendra K. Mehta
  • Patent number: 4833205
    Abstract: Ground polymeric elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at leasts one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties. The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and SO.sub.2 with or without added oxygen.
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: May 23, 1989
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Bernard D. Bauman, Patricia E. Burdick, Rajendra K. Mehta
  • Patent number: 4771110
    Abstract: Ground polymer elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at least one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties. The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and SO.sub.2 with or without added oxygen.
    Type: Grant
    Filed: February 4, 1986
    Date of Patent: September 13, 1988
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Bernard D. Bauman, Patricia E. Burdick, Rajendra K. Mehta
  • Patent number: 4764405
    Abstract: The present invention is a method for improving the barrier properties of thermoplastic substrates. A surface of the thermoplastic substrate is contacted with a reactive gas stream having an F.sub.2 concentration greater than or equivalent to 0.0001 atm. partial pressure of F.sub.2 per atm. total pressure and sufficient oxygen such that the F.sub.2 /O.sub.2 ratio is less than or equal to about 100, with the remainder being additional reactive and/or non-reactive components. A barrier coating material is applied to the treated surface of the substrate and subsequently undergoes a curing step to form the final product.
    Type: Grant
    Filed: July 22, 1987
    Date of Patent: August 16, 1988
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Bernard D. Bauman, Rajendra K. Mehta, Mark A. Williams
  • Patent number: 4659674
    Abstract: A method is provided for determining the impermeability of a polymeric article to a fluid by the steps of:(a) allowing a permeant to diffuse through the polymeric article for a preselected period of time,(b) converting permeant, diffusing through the article, to an ion by a chemical reaction and(c) measuring the amount of ion formed quantitatively with an ion-selective electrode.A method is further provided wherein a polymeric article is exposed to a permeant for a fixed period of time; removed from contact with the permeant; exposed to a chemical which will convert permeant, back-diffusing through the polymeric article, to an ion; and quantitatively measuring the amount of thus-formed ion with a ion-specific electrode.
    Type: Grant
    Filed: September 28, 1983
    Date of Patent: April 21, 1987
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Bernard D. Bauman, Rajendra K. Mehta