Stephen Scott Bradshaw

US Patent:

47711728, Sep 13, 1988

Filed:

May 22, 1987

Appl. No.:

7/053359

Inventors:

Stephen C. Bradshaw - Watsonville CA
John E. P. Syka - Sunnyvale CA

Assignee:

Finnigan Corporation - San Jose CA

International Classification:

H01J 4942

US Classification:

250282

Abstract:

A method is disclosed for increasing the dynamic range and sensitivity of a quadrupole ion trap mass spectrometer operating in the chemical ionization mode. Prior to mass analysis, a prescan is performed with the ion trap and the ionization and reaction periods are adjusted to produce enough stored product or analyte ions to generate a good signal-to-noise ratio in the detection of trace amounts of analyte, yet not so many analyte ions that resolution in the mass spectrum is lost. A mass analysis scan is then performed with the ion trap using the ionization and reaction periods predetermined during the prescan.

US Patent:

40633683, Dec 20, 1977

Filed:

Aug 16, 1976

Appl. No.:

5/714790

Inventors:

Robert L. McFarland - Carmel CA
Stephen C. Bradshaw - Salinas CA

Assignee:

Manned Systems Sciences, Inc. - Westlake Village CA

International Classification:

F41G 326

US Classification:

35 25

Abstract:

A multiple laser beam system comprises a laser device which is intended to be attached on or near the barrel of a rifle or the like such that triggering of the weapon activates the laser transmitter and results in the laser device producing a plurality of beams which by means of an adjustable diverging lens on the laser device may be defocused to produce an overlapping pattern. The beams are transmitted sequentially by the laser head assembly while timing of the transmission of the beams is controlled by electronic beam encoding logic. When the weapon is fired a mechanical-to-electrical transducer is energized and generates an electrical signal used to trigger the laser firing sequence. Visual indication means are provided to indicate that the laser timing sequence has been initiated. The light beam is detected by a target having a plurality of light sensing detectors.