David Frank Pierson

US Patent:

20130088213, Apr 11, 2013

Filed:

Jul 31, 2012

Appl. No.:

13/562847

Inventors:

David PIERSON - Portland OR, US

Assignee:

VERIS INDUSTRIES, LLC - Portland OR

International Classification:

G01R 23/14
G01R 35/04

US Classification:

324 74, 324 7641

Abstract:

A current switch that can be reset when it is not powered automatically calibrates itself when the circuit monitored by the current switch is energized.

US Patent:

20230003484, Jan 5, 2023

Filed:

Jul 5, 2022

Appl. No.:

17/857944

Inventors:

- Newington NH, US
David Pierson - Tualatin OR, US

International Classification:

F41G 1/35
F21V 8/00

Abstract:

A target dot sight includes a target illumination sensor that senses the amount of illumination at a target, rather than merely sensing the ambient sight of the entire operating environment. Then, based on the sensed target illumination, the target dot sight may automatically compensate for the brightness of the target.

US Patent:

20210239426, Aug 5, 2021

Filed:

Jan 19, 2021

Appl. No.:

17/152745

Inventors:

- Newington NH, US
David Pierson - Tualatin OR, US

International Classification:

F41G 1/35
F21V 8/00

Abstract:

A target dot sight includes a target illumination sensor that senses the amount of illumination at a target, rather than merely sensing the ambient sight of the entire operating environment. Then, based on the sensed target illumination, the target dot sight may automatically compensate for the brightness of the target.

US Patent:

20150219691, Aug 6, 2015

Filed:

Jan 22, 2015

Appl. No.:

14/602986

Inventors:

- Tualatin OR, US
David PIERSON - Tigard OR, US
Michael L. JOHNSON - Molalla OR, US

International Classification:

G01R 15/18
G01R 1/20

Abstract:

A transformer for monitoring current in a power cable is magnetically linked with the power cable connected to the electrical device, where the transformer produces a changing transformer signal in response to the presence of a changing current within the power cable. An input circuit located proximate to the transformer and having an output terminal and being electrically connected to the transformer so as to receive the changing transformer signal. The input circuit produces, in response to receiving the changing transformer signal, one of a first signal representative of the changing current, and a first circuit condition at the output terminal of the input circuit representative of the changing current in the power cable. The input circuit includes an impedance set having an effective impedance that comprises a plurality of elements, wherein at least one of the elements is not electrically connected to the remaining the plurality of elements.