Roy Eugene Rice

US Patent:

51206854, Jun 9, 1992

Filed:

Dec 18, 1990

Appl. No.:

7/629754

Inventors:

Tariq Quadir - Columbia MD
Roy W. Rice - Alexandria VA

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

C04B 3558

US Classification:

501 97

Abstract:

Low cost sintered silicon nitride suitable for use as a structural ceramic is provided. Certain low grade silicon nitride powders can be used to produce low cost sintered silicon nitride bodies having good mechanical properties. Compositions using such silicon nitride powders in combination with various sintering aids are also disclosed.

US Patent:

42334772, Nov 11, 1980

Filed:

Jan 31, 1979

Appl. No.:

6/008028

Inventors:

Roy W. Rice - Alexandria VA
Robert C. Pohanka - Springfield VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01L 4110
H04R 1700

US Classification:

179110A

Abstract:

A flexible, composite, acoustical energy transducer made from ferroelectric, piezoelectric, and/or electrostrictive materials in combination with a polymer, such as silicone or polyvinylidene fluoride (PVF. sub. 2), preferably having electroelastic properties. The materials are formed into platelets or wafers which have electrodes on their facial surfaces and are arranged within the polymer with each wafer in the same x-y plane such that their polarizations are in the same direction and perpendicular to the x-y plane. The wafers are aligned in directed rows, spaced from each other and are totally encased within the polymer. Thin conductive sheet or foil electrodes are secured to the upper and lower faces of the polymer and a conductive material between each wafer and the foil electrically connects the wafers to the foil electrodes. To protect the electrodes and prevent electrical shorting, a rubber coating or any other suitable insulator may be applied to the outside of the electrodes. The polymer is flexible and therefore the transducer can be formed into most any desired shape or placed on a flat or curved surface.

US Patent:

51767325, Jan 5, 1993

Filed:

Sep 10, 1991

Appl. No.:

7/758915

Inventors:

Jacob Block - Rockville MD
John W. Lau - Gaithersburg MD
Roy W. Rice - Alexandria VA
Anthony J. Colageo - Sharon MA

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

C03B 1910

US Classification:

65 214

Abstract:

Low sodium hollow glass microspheres containing less than about 3 wt. % Na. sub. 2 O are produced from aqueous precursors. The method comprises a) forming an aqueous glass precursor solution or slurry by combining sources of cations contained in the glass, the solution or slurry comprising all of the glass cations in proportions substantially identical to those in the glass, b) forming the solution or slurry into droplets, and c) heating the droplets to form the microspheres. The precursor may also contain surfactants, blowing agents or other known expedients. Nonionic fluorocarbon surfactants are preferred. The droplets may be formed by spraying or any other known technique. The droplets may be spray dried prior to heating step c).

US Patent:

50305999, Jul 9, 1991

Filed:

Jul 19, 1990

Appl. No.:

7/555330

Inventors:

Tariq Quadir - Columbia MD
Roy W. Rice - Alexandria VA

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

C04B 3558

US Classification:

501 98

Abstract:

A sintered silicon nitride product is made having a high flexural strength by sintering a mixture of silicon nitride and a sintering aid containing alumina and at least a three component rare earth oxide mixture which does not contain yttria. Based on the weight of the final sintered nitride product, the three component rare earth oxide mixture comprises about 3 to 6% La. sub. 2 O. sub. 3, 2 to 5% Nd. sub. 2 O. sub. 3, and 1 to 4 CeO. sub. 2. An additional fourth component, Pr. sub. 6 O. sub. 11, can be added in an amount of 0. 5 to 1. 1%.

US Patent:

46422714, Feb 10, 1987

Filed:

Feb 11, 1985

Appl. No.:

6/700246

Inventors:

Roy W. Rice - Alexandria VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B32B 900

US Classification:

428698

Abstract:

A ceramic fiber composite material comprised of boron nitride coated cera fibers embedded in a ceramic matrix. The boron nitride coating limits both physical bonding and chemical reaction between the fibers and matrix to improve both strength and toughness of the composite material.

US Patent:

46422188, Feb 10, 1987

Filed:

Oct 19, 1984

Appl. No.:

6/662933

Inventors:

Roy W. Rice - Alexandria VA

Assignee:

The United States of America as represented by the Secretary of the Navy

International Classification:

C22C 3200

US Classification:

419 11

Abstract:

A method for producing high technology ceramics with minimal porosity comsing the steps of filling a can with a constituent powder of a ceramic, creating a vacuum in the can and maintaining the vacuum throughout the entire process; outgassing the powder in the can by placing a furnace around the area of the can that encloses the powder and heating the furnace to at least 100. degree. C. ; removing the furnace after a minimum of five minutes of heating; cold rolling the can in a rolling system; igniting the powder so a localized propagation reaction front is created; and hot rolling the can in the rolling system so the propagation reaction front is maintained between the rolls of the rolling system.

US Patent:

43048706, Dec 8, 1981

Filed:

Feb 20, 1980

Appl. No.:

6/122944

Inventors:

Roy W. Rice - Alexandria VA
William J. McDonough - Alexandria VA
Stephen W. Freiman - Potomac MD
John J. Mecholsky - Albuquerque NM

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C04B 3558

US Classification:

501 98

Abstract:

A tough, ablative-resistant, dielectric ceramic material is constructed using powder metallurgy techniques. The composite comprises a boron nitride particulate phase immersed in an Al. sub. 2 O. sub. 3 matrix. The boron nitride particles are preferably 3-5 microns in size, and create the capability of sustaining thermal strains without generating the thermal stresses that lead to material failure. The composite displays superior mechanical strength characteristics.

US Patent:

50735268, Dec 17, 1991

Filed:

Aug 1, 1990

Appl. No.:

7/544437

Inventors:

Jack H. Enloe - Columbia MD
John W. Lau - Gaithersburg MD
Roy W. Rice - Alexandria VA

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

C04B 3558

US Classification:

501 96

Abstract:

An electronic package comprising dielectric layers including a densified aluminum nitride (AlN) base layer and at least one densified AlN-borosilicate glass composite layer bonded thereto is described. Any of the dielectric layers may be metallized with conductive circuit patterns and can contain conductive vias. Production of this package is accomplished by hot pressing a greenware laminate comprising a densified base (e. g. , AlN); at least one green sinterable sheet (e. g. , AlN-borosilicate glass composite); and a green sheet of non-sinterable material (e. g. , boron nitride [BN]). The respective green sheets comprise homogeneous mixtures of the ceramic powders and a binder, e. g. , polyethylene. The polyethylene is burnt off during the hot press operation.