Robert R Harper

US Patent:

20120282634, Nov 8, 2012

Filed:

Apr 23, 2012

Appl. No.:

13/453465

Inventors:

Gary Hughes - Anderson IN, US
Aniruddha Patwardhan - Indianapolis IN, US
Darby Mcchesney - Lawrenceville NJ, US
Robert Harper - Marlton NJ, US
Heather Tomeo - Avon IN, US
Frank LaDuca - East Brunswick NJ, US

Assignee:

Polymer Technology Systems, Inc. - Indianapolis IN

International Classification:

G01N 33/566

US Classification:

435 725

Abstract:

A dry test strip layer for filtering red blood cells includes a Borosilicate Glass Fiber layer and lectin, impregnated in the borosilicate layer, such that the dry test strip is configured to filter red blood cells from a blood sample.

US Patent:

41561635, May 22, 1979

Filed:

Sep 19, 1977

Appl. No.:

5/834040

Inventors:

Robert Harper - Concord MA
Robert M. Unger - Wayland MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01J 2534

US Classification:

315 35

Abstract:

A travelling wave tube of the coupled cavity type including a slow wave propagating structure comprised of a linear array of transverse plates axially spaced apart to provide a sequential series of interposed cavities, each of the plates having a cavity coupling aperture radially spaced from an electron beam transmitting aperture and spanned by at least one thermally conductive, dielectric member made of diamond material, which has respective surface areas disposed in thermal contact with opposing side walls of the cavity coupling aperture.

US Patent:

48073555, Feb 28, 1989

Filed:

Jun 3, 1988

Appl. No.:

7/201803

Inventors:

Robert Harper - Concord MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01J 900

US Classification:

29600

Abstract:

Slow-wave structures are formed by the method of this invention in the form of helical or coupled-cavity structures. A helical waveguide form of slow-wave structure is formed of a solid rod of copper machined with a deep, narrow helical groove. A copper sleeve is brazed to the periphery of the resulting helical thread to form a helically spiraling pathway about a solid axially centered and axially extending center portion. The center portion is then totally eroded away to form a slow wave structure having a helical radially-extending portion, or if only partially eroded with an inner helical axially-extending ridge to provide a helical axially-centered gap between adjacent ridges. The coupled-cavity forms of waveguide slow-wave structures are formed by machining disks from a solid rod of copper. The disks are supported in their desired positions by an axial retained portion of the rod until the disks are brazed inside a cylindrical shell of copper. After brazing, the axial retained portion is removed in whole or part to form the completed slow-wave structure.

US Patent:

47650567, Aug 23, 1988

Filed:

Apr 3, 1986

Appl. No.:

6/847999

Inventors:

Robert Harper - Concord MA
Joseph L. Rousseau - Billerica MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01J 900

US Classification:

29600

Abstract:

A waveguide helical slow-wave structure is formed of a solid rod of copper machined with a deep, narrow helical groove. A copper sleeve is brazed to the periphery of the resulting helical thread to form a helically spiraling pathway about a solid axially centered and axially extending center portion. The center portion is then partially eroded away to form a slow wave structure having a helical radially-extending portion with an inner helical axially-extending ridge to provide a helical axially-centered gap between adjacent ridges. The slow wave structure contains the microwave energy which follows the spiral path of the structure and produces RF voltage across the gap of adjacent portions of the ridges to thereby form a gapped-wall surrounding an axially-extending hole for gap electric field interaction with the axial electron beam of a traveling wave tube of which the slow wave structure is a part.

US Patent:

48517364, Jul 25, 1989

Filed:

Jun 3, 1988

Appl. No.:

7/201804

Inventors:

Robert Harper - Concord MA
Cheryl V. Liss - Merrimack NH

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01J 2534
H01P 508

US Classification:

315 35

Abstract:

Slow-wave structures are formed by the method of this invention in the form of helical or coupled-cavity structures. A helical waveguide form of slow-wave structure is formed of a solid rod of copper machined with a deep, narrow helical groove. A copper sleeve is brazed to the periphery of the resulting helical thread to form a helically spiraling pathway about a solid axially centered and axially extending center portion. The center portion is then totally eroded away to form a slow wave structure having a helical radially-extending portion, or if only partially eroded with an inner helical axially-extending ridge to provide a helical axially-centered gap between adjacent ridges. The helix is extended into a rectangular waveguide for coupling the slow-wave structure to the source and to the load. The coupled-cavity forms of waveguide slow-wave structures are formed by machining disks from a solid rod of copper. The disks are supported in their desired positions by an axial retained portion of the rod until the disks are brazed inside a cylindrical shell of copper.

US Patent:

39492630, Apr 6, 1976

Filed:

Dec 20, 1974

Appl. No.:

5/535009

Inventors:

Robert Harper - Concord MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01J 2534

US Classification:

315 35

Abstract:

Diamond heat sink members are now employed to conduct thermal energy from slow wave structures in traveling wave type interaction devices to permit operation at high power levels. The diamond members are bonded to adjacent desired components by a method including heating an intermediate metal alloy of an inactive conductive metal and a small amount of a carbide constituent in a vacuum and the application of pressure. A critical temperature slightly above the melting point of the alloy of between 1000. degree. C and 1100. degree. C is required to wet and bond the alloy material to the diamond and any desired surface.

US Patent:

42789141, Jul 14, 1981

Filed:

Oct 18, 1979

Appl. No.:

6/086213

Inventors:

Robert Harper - Concord MA

Assignee:

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

International Classification:

H01J 2534

US Classification:

315 35

Abstract:

A slow wave guiding structure such as a helix delay line for electron intction devices of the traveling wave type having diamond heat sink supports for substantial enhancement of power levels of operation is provided. The diamond supported helix structures are maintained in good thermal contact by pressure only in lieu of the diamonds being bonded to metallic members. The invention is applicable to numerous slow wave structures including ladder, ring-bar, meander, as well as interdigital types.

US Patent:

42824575, Aug 4, 1981

Filed:

Jun 18, 1979

Appl. No.:

6/049378

Inventors:

Robert Harper - Concord MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01J 2534

US Classification:

315 36

Abstract:

A traveling wave tube (TWT) has a slow wave structure in the form of a helix for amplifying the forward electromagnetic wave. The TWT is provided with an outer slow wave assembly for attenuating a backward wave to provide stability to the TWT. A set of ceramic rods are uniformly spaced circumferentially around the helix for supporting the outer slow wave assembly which is formed by an electrically conducting wire wound around the supporting rods. The wire is wound in a helical fashion with individual turns of the helix being spaced apart to form the outer slow wave structure. An electrically conducting cylinder surrounds the outer slow wave structure and is in contact therewith only at the sites of the rods. Dielectric slabs, having a slow wave structure such as a meander line disposed thereon, are inserted periodically around the outer slow wave structure in spaces between the winding and the cylinder. The spacing between the turns of the winding is selected for coupling a backward wave of a specific frequency to the dielectric slabs for attenuation of the backward wave.