Jeffrey C Jorgensen

US Patent:

49581082, Sep 18, 1990

Filed:

Feb 14, 1989

Appl. No.:

7/310610

Inventors:

Jeffrey A. Jorgensen - Bothell WA

Assignee:

Avtech Corporation - Seattle WA

International Classification:

H05B 4136

US Classification:

315307

Abstract:

A ballast having a converter for converting input power into DC at a high frequency and a commutator for converting the DC to AC at a low frequency to cause light emission from a gas discharge lamp. The converter also contains a transformer for converting the input AC to a low voltage AC for heating the filaments in the lamp. Current and Voltage sensors associated with the commutator provide feedback to control circuitry which allows power conversion after the filaments heat and the voltage to the lamp to increase to the voltage required to start the lamp even when different starting voltage requirement lamps are used. After the lamp starts, the lamp is soley current mode controlled. By frequency modulation of the commutator, both power and crest factor can be controlled.

US Patent:

48703273, Sep 26, 1989

Filed:

Jul 27, 1987

Appl. No.:

7/077760

Inventors:

Jeffrey A. Jorgensen - Bothell WA

Assignee:

Avtech Corporation - Seattle WA

International Classification:

H05B 4136

US Classification:

315307

Abstract:

A ballast for controlling the light emitted by fluorescent lamps (25) is disclosed. DC power derived from either a DC source or a rectified AC source is switched on and off at a high frequency rate by a switch (15) to control the flow of current through the primary winding of the transformer of a flyback converter (27). The switched output is rectified and applied by the flyback converter to the filaments of the fluorescent lamps (25) to be controlled. The rectified, switched output is also applied by a. pi. filter (17) to a commutator circuit (21) that controls the starting of the fluorescent lamps (25). The commutator circuit (21) is switched at a lower frequency rate. The bridge input voltage and current are sensed and fed back to a control circuit (23), which includes a regulating pulse width modulator and a bridge switching circuit. The control circuit (23) also receives a pulse current feedback signal from the switch (15) and an external dimming control signal. The control circuit (23) controls the application of high frequency switching signals to the switch (15) that controls the application of power by the flyback converter based on the voltage, current and pulse current feedback signals.

US Patent:

20190153862, May 23, 2019

Filed:

Jan 29, 2019

Appl. No.:

16/261042

Inventors:

- Salt Lake City UT, US
Jeffrey D. Jorgensen - Murray UT, US
Jeffrey G. Burton - Farmington UT, US
Jeffrey J. Schwoebel - Park City UT, US
Michael J. Hardin - Draper UT, US
Forrest Paul Schumacher - Sandy UT, US

Assignee:

REI, Inc. - Salt Lake City UT

International Classification:

E21D 21/00
E21D 20/00
E21D 11/15
E21D 11/00
E21B 7/06
E21B 4/02
E21D 20/02
E21D 11/40

Abstract:

The present application relates to a system for supporting a roof of a portion of a mine. The system includes a first plurality of stabilizing members disposed above the roof at a first elevation. The first plurality of stabilizing members originate from a first common location and terminate at a second elevation that is higher than the first elevation. The system further includes a second plurality of stabilizing members disposed above the roof and the first plurality of stabilizing members at a third elevation. The second plurality of stabilizing members originate from a second common location and terminate at a fourth elevation that is higher than the third elevation. The second plurality of stabilizing members are disposed generally perpendicular to the first plurality of stabilizing members.

US Patent:

20160348505, Dec 1, 2016

Filed:

Aug 11, 2016

Appl. No.:

15/234537

Inventors:

- Salt Lake City UT, US
Jeffrey D. Jorgensen - Murray UT, US
Jeffrey G. Burton - Farmington UT, US
Jeffrey J. SCHWOEBEL - Park City UT, US
Michael J. Hardin - Draper UT, US
Forrest Paul SCHUMACHER - Sandy UT, US

Assignee:

REI, Inc. - Salt Lake City UT

International Classification:

E21D 21/00

Abstract:

The present application relates to a system for supporting a roof of a portion of a mine. The system includes a first plurality of stabilizing members disposed above the roof at a first elevation. The first plurality of stabilizing members originate from a first common location and terminate at a second elevation that is higher than the first elevation. The system further includes a second plurality of stabilizing members disposed above the roof and the first plurality of stabilizing members at a third elevation. The second plurality of stabilizing members originate from a second common location and terminate at a fourth elevation that is higher than the third elevation. The second plurality of stabilizing members are disposed generally perpendicular to the first plurality of stabilizing members.

US Patent:

20150300168, Oct 22, 2015

Filed:

Jul 2, 2015

Appl. No.:

14/790263

Inventors:

- Salt Lake City UT, US
Jeffrey D. Jorgensen - Murray UT, US
Jeffrey G. Burton - Farmington UT, US
Jeffrey J. Schwoebel - Crozet VA, US
Michael J. Hardin - Draper UT, US
Forrest Paul Schumacher - Salt Lake City UT, US

Assignee:

REI, Inc. - Salt Lake City UT

International Classification:

E21D 11/00
E21D 21/00
E21D 11/40
E21D 11/15
E21D 20/00

Abstract:

The present application relates to a system for supporting a roof of a portion of a mine. The system includes a first plurality of stabilizing members disposed above the roof at a first elevation. The first plurality of stabilizing members originate from a first common location and terminate at a second elevation that is higher than the first elevation. The system further includes a second plurality of stabilizing members disposed above the roof and the first plurality of stabilizing members at a third elevation. The second plurality of stabilizing members originate from a second common location and terminate at a fourth elevation that is higher than the third elevation. The second plurality of stabilizing members are disposed generally perpendicular to the first plurality of stabilizing members.