Karl J Hildebrand

US Patent:

43408451, Jul 20, 1982

Filed:

Jul 16, 1980

Appl. No.:

6/169288

Inventors:

Karl J. Hildebrand - Tyngsboro MA
John Leeman - Andover MA

Assignee:

Leeman Labs, Inc. - Tewksbury MA

International Classification:

H01J 102

US Classification:

315327

Abstract:

A stabilized cathode assembly for an arc light source is disclosed wherein an unattached end of a length of electrically conducting braid serving as a cathode is held in close proximity to the anode of the source to establish an arc path between the braid end and the anode. Support means are disclosed which function to advance and withdraw the braid to initiate the arc. Application of the assembly in a spectrometer sample excitation device is further disclosed.

US Patent:

43915230, Jul 5, 1983

Filed:

Mar 23, 1981

Appl. No.:

6/246716

Inventors:

Karl J. Hildebrand - Tyngsboro MA
John Leeman - Andover MA

Assignee:

Leeman Labs Inc. - Tewksbury MA

International Classification:

G01J 334
G01J 338

US Classification:

356328

Abstract:

A scannable detector system for echelle grating spectrometers is disclosed in which a photodetector is positioned behind an aperture plate having a plurality of apertures corresponding to focal positions of the spectral array eminating from the grating. The detector is arranged to scan from aperture to aperture to measure the presence of individual wavelengths in the array. Additionally, the detector may be removed from the field of the plate to permit the substitution of a non-scannable array of detectors and an associated masking aperture plate to simultaneously measure the presence of a plurality of wavelengths in the spectral array.

US Patent:

43962874, Aug 2, 1983

Filed:

May 4, 1981

Appl. No.:

6/260334

Inventors:

Karl J. Hildebrand - Tyngsboro MA
John Leeman - Andover MA

Assignee:

Leeman Labs Inc. - Tewksbury MA

International Classification:

G01N 2174

US Classification:

356244

Abstract:

A sample manipulation system for spectrometers is disclosed in which an electrically conductive filament is arranged to receive and hold a liquid containing sample. Various levels of electrical power are employed to heat the filament for such purposes as increasing the affinity of the filament for the liquid, evaporating the liquid after deposition, ashing the remaining sample, and exciting the sample. Separate contact points are provided for each power level as well as means to successively connect at least one end of the filament to each contact point.

US Patent:

41479572, Apr 3, 1979

Filed:

Jan 13, 1978

Appl. No.:

5/869164

Inventors:

Karl J. Hildebrand - Tyngsboro MA

Assignee:

SpectraMetrics, Incorporated - Andover MA

International Classification:

G01J 330
H01H 100
H05B 4116

US Classification:

3151112

Abstract:

A plasma jet device which comprises first and second anode electrodes spaced apart and positioned such that their axes, if extended, would intersect at an angle, and a third cathode electrode positioned offset from the plane formed by the extended axes of the first and second electrodes, the plasma jet device forming an ionized column of gas having the shape of an inverted Y and providing a stabilized excitation zone.

US Patent:

44444974, Apr 24, 1984

Filed:

Nov 12, 1981

Appl. No.:

6/320668

Inventors:

Karl J. Hildebrand - Tyngsboro MA
John Leeman - Andover MA

Assignee:

Leeman Labs, Inc. - Lowell MA

International Classification:

G01N 2174

US Classification:

356244

Abstract:

A sample transport and manipulation system and method for exciting a quantitatively uniform sample for spectrometric analysis over an extended period of time is disclosed. A uniform sample transport medium such as a filament is transported at a uniform rate through an excitation situs which is coincident with the optical input situs of the spectrometer. Means for uniformly depositing a liquid sample over the medium are included to complete the establishment of a system in which the spectrometer is presented with a quantitatively uniform excited sample on a continuous basis.

US Patent:

43056628, Dec 15, 1981

Filed:

Apr 21, 1980

Appl. No.:

6/141941

Inventors:

John Leeman - Andover MA
Karl J. Hildebrand - Tyngsboro MA

Assignee:

Leeman Labs, Inc. - Tewksbury MA

International Classification:

G01J 302
G01N 2162

US Classification:

356311

Abstract:

A sample excitation situs or light source enhancement apparatus for an optical spectrometer comprising a mirror arranged to reflect an image of the excitation situs in close proximity to the actual excitation situs is disclosed.

US Patent:

49416189, Jul 17, 1990

Filed:

Jul 7, 1986

Appl. No.:

6/882686

Inventors:

Karl J. Hildebrand - Tyngsboro MA
John Urh - Stoneham MA

Assignee:

Leeman Labs Inc. - Lowell MA

International Classification:

B05B 700

US Classification:

239432

Abstract:

A nebulizer for producing a quantity of fine liquid droplets consisting of a screen over which the liquid to be nebulized is flowed and a nozzle for directing a stream of gas at the screen. The force of the gas against the screen creates the droplets by shearing the liquid from the spaces in the mesh. A second screen in front of the first may be used to increase the uniformity of the output.