Patents by Inventor Chester R. O'Clair

Chester R. O'Clair 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).

  • Transparent polycrystalline garnets
    Patent number: 5484750
    Abstract: Transparent, polycrystalline garnet bodies having desirable properties for use as laser material, luminescent x-ray scintillator materials and other uses are produced by mixing a chloride source solution of the desired cations with a basic ammonium solution to produce a precipitate having a substantially uniform composition which can be further processed to provide the desired transparent body. This precipitate is separated from the solution, dried, thermally decomposed at a temperature in the range from 700.degree. to 1,000.degree. C., pressed to form a compact, isostatically pressed at up to 60,000 psi to provide a green, unsintered compact having a density in the vicinity of 55% of theoretic density. That green compact is then sintered in oxygen at a temperature between 1,400.degree. and 1,700.degree. C. to produce the desired transparent body. Alternatively, the compact may be sintered in oxygen at temperatures in the range from about 1,400.degree. to about 1,600.degree. C.
    Type: Grant
    Filed: August 10, 1994
    Date of Patent: January 16, 1996
    Assignee: General Electric Company
    Inventors: Charles D. Greskovich, William P. Minnear, Chester R. O'Clair, Erdogan O. Gurmen, Robert J. Riedner
  • Strontium-containing yttrium oxide ceramic body
    Patent number: 4769353
    Abstract: A polycrystalline body having a composition comprised of Y.sub.2-x Sr.sub.x O.sub.3-x/2 wherein x ranges from about 0.0015 to about 0.012.
    Type: Grant
    Filed: November 4, 1986
    Date of Patent: September 6, 1988
    Assignee: General Electric Company
    Inventors: Charles D. Greskovich, Chester R. O'Clair
  • Yttrium oxide ceramic body
    Patent number: 4755492
    Abstract: A sinterable yttrium oxide powder is produced useful for pressureless sintering a compact thereof into an optically translucent or transparent body. The yttrium oxide powder has a specified particle size range and specific surface area. It is formed by preparing yttrium oxalate hydrate powder by means of the wet chemical oxalate method, comminuting the yttrium oxalate hydrate powder to a required degree and calcining the yttrium oxalate hydrate.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: July 5, 1988
    Assignee: General Electric Company
    Inventors: Charles D. Greskovich, Chester R. O'Clair
  • Hot pressing of silicon nitride using magnesium silicide
    Patent number: 4124402
    Abstract: A dense polycrystalline silicon nitride body is produced by hot-pressing a particulate mixture of silicon nitride and a magnesium silicide additive.
    Type: Grant
    Filed: November 7, 1977
    Date of Patent: November 7, 1978
    Assignee: General Electric Company
    Inventors: Charles D. Greskovich, Chester R. O'Clair
  • Hot pressing of silicon nitride using beryllium additive
    Patent number: 4124403
    Abstract: A dense polycrystalline silicon nitride body is produced by hot-pressing a particulate mixture of silicon nitride and a beryllium additive.
    Type: Grant
    Filed: November 7, 1977
    Date of Patent: November 7, 1978
    Assignee: General Electric Company
    Inventors: Charles D. Greskovich, Svante Prochazka, Chester R. O'Clair
  • Hot pressing of silicon nitride using beryllium additive
    Patent number: 4122140
    Abstract: A dense polycrystalline silicon nitride body is produced by hot-pressing a particulate mixture of silicon nitride and a beryllium additive.
    Type: Grant
    Filed: January 3, 1977
    Date of Patent: October 24, 1978
    Assignee: General Electric Company
    Inventors: Charles D. Greskovich, Svante Prochazka, Chester R. O'Clair
  • Hot pressing of silicon nitride using magnesium silicide
    Patent number: 4093687
    Abstract: A dense polycrystalline silicon nitride body is produced by hot-pressing a particulate mixture of silicon nitride and a magnesium silicide additive.
    Type: Grant
    Filed: January 3, 1977
    Date of Patent: June 6, 1978
    Assignee: General Electric Company
    Inventors: Charles D. Greskovich, Chester R. O'Clair