David W Griffith

US Patent:

8270148, Sep 18, 2012

Filed:

Jul 7, 2010

Appl. No.:

12/831772

Inventors:

David Griffith - Apex NC, US
Gary Smith - Youngsville NC, US
Mark Lackey - Holly Springs NC, US

International Classification:

G06F 1/16

US Classification:

36167901, 349187, 345169, 455462

Abstract:

A suspension system for mounting a touch surface of a pressure sensitive touch display or panel. The suspension system comprises a frame and a flexible suspension membrane connected to the touch surface and the frame, the membrane allowing frictionless movement of the touch surface along the z-axis and resisting movement of the touch surface within the x-y plane. At least one force sensor is connected beneath the touch surface, whereby the touch surface is pre-loaded against the at least one force sensor.

US Patent:

20100072944, Mar 25, 2010

Filed:

Apr 22, 2009

Appl. No.:

12/427873

Inventors:

David Lee GRIFFITH - Apex NC, US
Michael Antonio GREEN - London, GB
Peter Hannes OLAFSSON - Mongkok, Kowloon, HK
Jon Ottar BIRGISSON - Hertfordshire, GB

Assignee:

STRAX UK LTD - Hertfordshire

International Classification:

H02J 7/00

US Classification:

320107, 320162

Abstract:

A charger is arranged to switch on automatically when a device, such as a mobile phone, is connected to the charger and switch off automatically when the device is removed from the charger. This is achieved by providing the charger with an interface, for the device to connect to, and a switch. The interface and switch are arranged on the charger such that the switch is depressed when the device is connected to the charger. Depressing the switch causes electricity to flow to the interface and allows the device to be charged.

US Patent:

20120200789, Aug 9, 2012

Filed:

Mar 21, 2012

Appl. No.:

13/425846

Inventors:

David Griffith - Apex NC, US
Mark Lackey - Raleigh NC, US
Curtiss Noble - Holly Springs NC, US

International Classification:

G02F 1/1335
G06F 1/16

US Classification:

349 12, 36167921

Abstract:

A suspension system for a differential-pressure touch sensitive panel suspended over force sensors, for use in either fixed or mobile devices such as point of sales terminals, kiosks, laptops, monitors, PDAs, cell phones, UMPCs and more. In one embodiment, a number of leaf springs are attached directly to the touch lens at both ends and attached directly to the underlying housing at the center, effectively pulling the leaf spring down at the center into a concave arc. The spring bias preloads the touch lens downward against the force sensors. The leaf springs bring the touch lens into a fixed state in the xy-plane and resist translation; however, the touch lens remains free to float against the bias of the leaf spring(s) without any frictional physical contact along the z-axis.

US Patent:

20130342501, Dec 26, 2013

Filed:

Jun 11, 2013

Appl. No.:

13/915267

Inventors:

David Griffith - Apex NC, US

International Classification:

G06F 3/041

US Classification:

345174

Abstract:

A hybrid touch-screen display that integrates force-based touch-screen technology with any one from among a group of projective capacitive, surface capacitive, resistive, digital resistive, SAW, IR, APR, DST, optical and electromagnetic touch-screen technologies to provide an ability to compensate for non-perfect force transfer. An alternate implementation is also disclosed that employs a single force sensor for relative force measurement in a system in which force is traditionally not measured, here a water dispenser unit. This allows compensation for varying static loads, run-time calibration, and filtering of extraneous loads through firmware.

US Patent:

20160216842, Jul 28, 2016

Filed:

Apr 6, 2016

Appl. No.:

15/091829

Inventors:

- Cupertino CA, US
David Griffith - Apex NC, US

International Classification:

G06F 3/041

Abstract:

A hybrid touch-screen display that integrates force-based touch-screen technology with any one from among a group of projective capacitive, surface capacitive, resistive, digital resistive, SAW, IR, APR, DST, optical and electromagnetic touch-screen technologies to provide an ability to compensate for non-perfect force transfer. An alternate implementation is also disclosed that employs a single force sensor for relative force measurement in a system in which force is traditionally not measured, here a water dispenser unit. This allows compensation for varying static loads, run-time calibration, and filtering of extraneous loads through firmware.