William H Hunter

US Patent:

50210769, Jun 4, 1991

Filed:

Mar 17, 1989

Appl. No.:

7/325184

Inventors:

Larry D. Kuykendall - Columbia MD
William J. Hunter - Fort Collins CO

Assignee:

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

International Classification:

C12P 0104
C12N 0120
C05F 1108

US Classification:

71 7

Abstract:

A prototrophic revertant of a Bradyrhizobium japonicum tryptophan auxotroph was isolated and found to fix more nitrogen symbiotically than wild-type bacteria. The increase in nitrogen fixation is due to an increase in nodule mass because of an increase in nodule number. The physiological basis for this improved symbiosis appears to be an alteration of the tryptophan biosynthetic pathway.

US Patent:

56046294, Feb 18, 1997

Filed:

Jul 27, 1993

Appl. No.:

8/099489

Inventors:

William R. Hunter - Springfield VA
James P. Long - Accokeek MD

Assignee:

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

International Classification:

G02B 520

US Classification:

359359

Abstract:

A thin film reflecting interference filter (RIF) is designed to suppress unwanted harmonics thereby improving the monochromaticity of the radiation. An interference layer of material which has a well-defined plasma oscillation is deposited on a substrate and a mismatch layer is formed thereon. This interference layer exploits the interference between wavefronts reflected from the layer-substrate and the vacuum-layer interfaces to suppress higher order harmonics, while allowing good reflectance at the fundamental wavelength. This is achieved by positioning the RIF in the radiation at an angle of incidence which is greater than the critical angle of the desired fundamental wavelength, but less than critical angles of the harmonics to be suppressed. The mismatch layer increases the reflectance of the unwanted harmonics at the vacuum-layer interface, thus allowing more complete destructive interference of the unwanted harmonics. The RIF can be tuned by altering the thickness of the layer, the composition of the layer and/or the angle of incidence of the radiation.

US Patent:

53110986, May 10, 1994

Filed:

May 26, 1992

Appl. No.:

7/888083

Inventors:

John F. Seely - Lorton VA
William R. Hunter - Springfield VA

Assignee:

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

International Classification:

H01J 134
H01J 4308

US Classification:

313542

Abstract:

An interference photocathode includes a reflective substrate and interference layers disposed on said reflective substrate for selectively enhancing a first photoelectric yield of said photocathode when irradiated by radiation having a first wavelength relative to a second photoelectric yield of said photocathode when irradiated by radiation having a second wavelength. In one embodiment, the interference layers include a dielectric layer having a wavelength dependent effective thickness disposed on said reflective substrate such that said effective thickness for radiation having said first wavelength is an odd multiple of a quarter of said first wavelength and said effective thickness for radiation having said second wavelength is an even multiple of a quarter of said second wavelength. In another embodiment, the dielectric layer includes a layer of electrically conductive material and a dielectric material disposed between said layer of electrically conductive material and said reflective substrate.

US Patent:

44626894, Jul 31, 1984

Filed:

Jul 9, 1982

Appl. No.:

6/398090

Inventors:

Milton N. Kabler - Alexandria VA
Richard T. Williams - Fairfax VA
Jack C. Rife - Washington DC
William R. Hunter - Springfield VA
Johnny P. Kirkland - Springfield VA
Neil C. Lien - Evansville WI

Assignee:

Baker Manufacturing Company - Evansville WI

International Classification:

G01J 318

US Classification:

356333

Abstract:

A scanning monochromator is disclosed which is capable of operation over a wide bandwidth in an ultra-high vacuum. The monochromator includes a pair of carousel assemblies carrying the optical elements which may be independently positioned translationally along the optical axis of the instrument and also rotationally, which each positioning control operable from outside of the instrument. A carousel on each of the carousel assemblies carries several optical elements and is rotatable to change which optical element is used, also from outside of the instrument.

US Patent:

53073959, Apr 26, 1994

Filed:

Sep 30, 1992

Appl. No.:

7/953697

Inventors:

John F. Seely - Lorton VA
William R. Hunter - Springfield VA

Assignee:

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

International Classification:

G21K 106

US Classification:

378 84

Abstract:

A mirror for reflecting radiation at a desired wavelength in the soft x-ray region, comprises a substrate and a coating on the substrate. The coating contains a first section and a second section. The first section comprises at least one layer made up of at least a spacer sublayer and a nodal sublayer. The optical thickness of each spacer sublayer is selected so that, upon application of the radiation of desired wavelength, the mirror generates a standing wave having a node in the middle of each nodal sublayer. The second section is disposed between the first section and the substrate, and comprises a plurality of optically absorptive layers.