Patents by Inventor Munirpallam A. Subramanian

Munirpallam A. Subramanian 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).

  • Superconducting metal oxide Tl-Pb-Ca-Sr-O compositions and processes for manufacture and use
    Patent number: 4894361
    Abstract: Compositions having the nominal formulaTl.sub.e Pb.sub.a Ca.sub.b Sr.sub.c Cu.sub.d O.sub.xwhereina is from about 1/10 to 3/2,b is from about 1 to 4,c is from about 1 to 3d is from about 1 to 5e is from about 3/10 to 1x=(a+b+c+d+e+y)wherey is from about 1/2 to 3,are superconducting. Processes for manufacturing such compositions and for using them are disclosed.
    Type: Grant
    Filed: August 24, 1988
    Date of Patent: January 16, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Munirpallam A. Subramanian
  • Process for making 90 K superconductors from acetate precursor solutions
    Patent number: 4866031
    Abstract: There is disclosed an improved process for preparing a superconducting composition having the formula MBa.sub.2 Cu.sub.3 O.sub.x wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu; x is from about 6.5 to about 7.0; said composition having a superconducting transition temperature of about 90 K; said process consisting essentially of preparing a precursor solution, drying the solution of obtain a solid material, and heating and cooling the solid material under specified conditions to obtain the desired product. In another embodiment, a shaped superconducting MBa.sub.2 Cu.sub.3 O.sub.x article is prepared by impregnating an article of cellulose material with the precursor solution, drying the impregnated article, and heating and cooling the impregnated article under prescribed conditions to obtain the desired product.
    Type: Grant
    Filed: June 9, 1987
    Date of Patent: September 12, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: John D. Bolt, Munirpallam A. Subramanian
  • Lanthanum: sodium copper superconducting metal oxide compositions and process for manufacture
    Patent number: 4835136
    Abstract: Compositions containing a phase having the formula LA.sub.2-x Na.sub.x CuOz wherein x is about 0.1 to about 0.3 and z is about 3.8 to about 4.2 are superconducting. Processes for manufacturing such compositions and for using them are disclosed.
    Type: Grant
    Filed: February 4, 1988
    Date of Patent: May 30, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jagannatha Gopalakrishnan, Arthur W. Sleight, Munirpallam A. Subramanian
  • Anorthite-cordierite based ceramics from zeolites
    Patent number: 4814303
    Abstract: Process for producing monolithic ceramic articles by sintering at temperatures from about 900.degree. C. to about 1350.degree. C. a shaped zeolite charge comprised of selected zeolites with Si/Al ratios of from about 0.7 to about 5.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: March 21, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Uma Chowdhry, David R. Corbin, Munirpallam A. Subramanian