Christopher E Graves

US Patent:

20200226540, Jul 16, 2020

Filed:

Jan 8, 2020

Appl. No.:

16/737726

Inventors:

- Dallas TX, US
Christopher Carter Graves - Dallas TX, US

Assignee:

Omnicounts, LLC - Dallas TX

International Classification:

G06Q 10/08
H04L 9/06

Abstract:

A cryptographically enforced ordering and hierarchical ledger for the distributed collection and processing of inventory data across multiple locations, areas and items is provided.

US Patent:

20170019733, Jan 19, 2017

Filed:

Sep 27, 2016

Appl. No.:

15/277579

Inventors:

- Dallas TX, US
Wenpang David Wang - Allen TX, US
Christopher Michael Graves - Sherman TX, US

International Classification:

H04R 3/00

Abstract:

An audio accessory key detection system () includes a host circuit (-) coupled to communicate via a microphone line () with an accessory circuit (-) in either a MSFT mode or a digital communication mode. Depletion mode transistors (-) in the accessory circuit are coupled between keys (-) of the accessory circuit, respectively. The depletion mode transistors are allowed to remain conductive for MSFT mode operation. For digital communications mode operation, the host circuit sends a command via the microphone line to a key detector and controller circuit (A) in the accessory circuit. In response, a voltage is generated to turn the depletion mode transistors off so as to allow digital communications mode operation between the accessory circuit and the host circuit.

US Patent:

20140369520, Dec 18, 2014

Filed:

Jun 18, 2013

Appl. No.:

13/920302

Inventors:

- Dallas TX, US
Vikas Suma Vinay - Dallas TX, US
Christopher M. Graves - Sherman TX, US
Baher S. Haroun - Allen TX, US

International Classification:

H03F 1/30
H02H 9/04

US Classification:

381 945, 361 56

Abstract:

Self-grounded circuitry () includes a signal channel conducting an output voltage (V). A charge pump () powered by a reference voltage (V) produces a control voltage (V). The control signal is at a low level if the reference voltage is low and is boosted to a high level if the reference voltage is high. A ground switch circuit () includes a depletion mode transistor (MP) having a source coupled to the output voltage, a gate coupled to the control voltage, and a drain coupled to ground. The transistor includes a well region (-) and a parasitic substrate diode (D-). A negative voltage protection circuit (-) includes a depletion mode first protection transistor (MP-) having a drain coupled to the well region, a source coupled to a source of a depletion mode second protection transistor (MP-) having a drain coupled to the output voltage, the first and second protection transistors each having a gate coupled to the control voltage, and also includes a diode (MN) coupled to charge the well region from the control voltage conductor to prevent distortion of the output voltage.

US Patent:

20140254809, Sep 11, 2014

Filed:

Mar 6, 2013

Appl. No.:

13/787185

Inventors:

- Dallas TX, US
Wenpang David Wang - Plano TX, US
Christopher Michael Graves - Sherman TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04R 29/00

US Classification:

381 58

Abstract:

An audio accessory key detection system () includes a host circuit (-) coupled to communicate via a microphone line () with an accessory circuit (-) in either a MSFT mode or a digital communication mode. Depletion mode transistors (-) in the accessory circuit are coupled between keys (-) of the accessory circuit, respectively. The depletion mode transistors are allowed to remain conductive for MSFT mode operation. For digital communications mode operation, the host circuit sends a command via the microphone line to a key detector and controller circuit (A) in the accessory circuit. In response, a voltage is generated to turn the depletion mode transistors off so as to allow digital communications mode operation between the accessory circuit and the host circuit.