David M Stevenson

US Patent:

6350275, Feb 26, 2002

Filed:

Jun 9, 1998

Appl. No.:

09/094231

Inventors:

Hendrik J. Vreman - Los Altos CA
David K. Stevenson - Los Altos CA

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA

International Classification:

A61N 506

US Classification:

607 88, 607 91

Abstract:

A device is provided for treating a circadian rhythm disorder in a subject. The device includes a plurality of light emitting diodes (LEDs), preferably blue to green; a mounting to which the LEDs are connected: a material for positioning the LEDs within 3 cm of the subject, with an orientation toward the subject; a portable power supply electrically connected to the LEDs; and a control connected to the LEDs for altering the operation of the LEDs. The device is sufficiently light and compact to be comfortably worn by the subject. One or more such devices are used to deliver light to a subjects retinas, to the subjects vascular tissue, or simultaneously to both the retinas and the vascular tissue. For illumination of the retina, small chip-type LEDs are integrated into the frames of eyeglasses and positioned to direct light into the eyes of the subject. For illumination of the vascular tissue, an array of lens or chip type LEDs are contained in a casing that is secured against the skin of the subject.

US Patent:

6596016, Jul 22, 2003

Filed:

Apr 19, 2000

Appl. No.:

09/551946

Inventors:

Hendrik J. Vreman - Los Altos CA
Daniel S. Seidman - Tel-Aviv, IL
David K. Stevenson - Los Altos Hills CA

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Stanford CA

International Classification:

A61N 506

US Classification:

607 88, 607 91, 2906, 600310, 600315, 128903, 128904

Abstract:

A phototherapy garment contains a flexible backing material, a transparent liner, and a flexible printed circuit sheet containing surface-mounted light-emitting diodes (LEDs) positioned between the backing material and the liner. An infant is placed inside the garment so that the LEDs illuminate a large portion of the infants skin for phototherapy. The LEDs preferably emit high-intensity blue light, suitable for treatment of neonatal hyperbilirubinemia or Crigler-Najjar syndrome. The LEDs are arranged in a densely packed array facing the liner and emit uniform, high intensity light. A power supply, which may be portable, supplies adjustable power to the LEDs, preferably pulsed with a duty cycle of approximately 10%, and preferably to overdrive the LEDs to maximize light output. A two-way communications device incorporated into the garment allows a physician or computer to control the garment remotely and gather relevant information periodically or continuously. The garment may also contain a feedback system with skin bilirubin sensors, so that the intensity level and duration of light therapy can be based on bilirubin in the skin, which is a reflection of the newborns serum bilirubin concentration.

US Patent:

7469826, Dec 30, 2008

Filed:

Oct 31, 2005

Appl. No.:

11/263080

Inventors:

David Ciancio - Hamilton OH, US
David Stevenson - Littleton CO, US

Assignee:

The Kroger Co. - Cincinnati OH

International Classification:

G06K 15/00

US Classification:

235383, 235381, 705 14, 705 16, 705 21

Abstract:

A combined in-store and fuel center point-of-sale system having a first point-of-sale system, having a checkout manager and one or more checkout terminals, and a second point-of-sale system, having a fuel center and one or more fuel pumps, in communication with each other and with one or more primary databases containing marketing data, consumer data, customer data, master sales data, discount data, and merchandise product data, for generating a fuel discount at the second point-of-sale system based on first purchasing activity at the first point-of-sale system and/or second purchasing activity at said second point-of-sale system. The fuel discount is maintained for each customer in one of said primary databases and is based on a total purchase of products, a total purchase of product units, a total purchase amount of a product type, time period for total purchase of products, or a tiered spending amount.

US Patent:

8123125, Feb 28, 2012

Filed:

Dec 23, 2008

Appl. No.:

12/342385

Inventors:

David Ciancio - Hamilton OH, US
David Stevenson - Littleton CO, US

Assignee:

The Kroger Co. - Cincinnati OH

International Classification:

G06K 5/00

US Classification:

235380, 235375, 235383

Abstract:

A combined in-store and fuel center point-of-sale system having a first point-of-sale system, having a checkout manager and one or more checkout terminals, and a second point-of-sale system, having a fuel center and one or more fuel pumps, in communication with each other and with one or more primary databases containing marketing data, consumer data, customer data, master sales data, discount data, and merchandise product data, for generating a fuel discount at the second point-of-sale system based on first purchasing activity at the first point-of-sale system and/or second purchasing activity at said second point-of-sale system. The fuel discount is maintained for each customer in one of said primary databases and is based on a total purchase of products, a total purchase of product units, a total purchase amount of a product type, time period for total purchase of products, or a tiered spending amount.

US Patent:

43892744, Jun 21, 1983

Filed:

Mar 23, 1981

Appl. No.:

6/246529

Inventors:

David A. Stevenson - Los Altos Hills CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C30B 1900

US Classification:

156624

Abstract:

A method for removing residual oxygen from a growth solution prior to liq phase epitaxial crystal growth comprising the steps of disposing the materials in a containment vessel of a solid oxide electrolyte material under a protective atmosphere, heating the materials to form a liquid charge in the containment vessel, placing an electrode of an inert conducting solid in physical contact with the liquid charge, and applying a DC electric potential between the electrode and the containment vessel, the electrical contact to the containment vessel being made through a porous metallic coating of an inert metal on the outside surface of the containment vessel in the region where the liquid charge is contiguous to the inside surface of the containment vessel, the porous coating being relatively positive and the electrode being relatively negative.

US Patent:

47915501, Dec 13, 1988

Filed:

Sep 30, 1987

Appl. No.:

7/103123

Inventors:

David R. Stevenson - Los Altos Hills CA
Michael T. Devlin - Sunnyvale CA

Assignee:

Rational - Santa Clara CA

International Classification:

G06F 944

US Classification:

364200

Abstract:

A higher order language-directed computer architecture particularly adaptable for fourth generation program languages. The computer includes a memory which stores package modules and task modules for programs, each of which includes a control segment representing control for the module, a code segment representing instructions for the computer relating to the module, a data segment, a type segment representing type descriptors declared for the module, a queue segment containing synchronization messages for controlling queuing between task modules and an import segment containing lists of objects outside a module which are accessible within the module. The computer simultaneously manipulates portions of the segments based on instructions in the code segment.

US Patent:

43714200, Feb 1, 1983

Filed:

Mar 9, 1981

Appl. No.:

6/241997

Inventors:

David A. Stevenson - Los Altos Hills CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C30B 904

US Classification:

156624

Abstract:

In a process for growth of a layer of semiconductor material by precipitation from a solution of the semiconductor material in a solvent by liquid phase epitaxial growth (LPE), the improvement is the step of adding from approximately 0. 01% to 1. 0% by weight of a material which forms a stable oxide or sulfide and is soluble in the solvent to the solution prior to the step of precipitating the semiconductor layer to eliminate the deleterious effects of residual oxygen. A relatively short annealing time is required to dissolve the addition in the solvent and allow the addition to react with dissolved oxygen or other impurities before a conventional LPE growth process may be initiated, although high temperature anneals of varying length may precede or follow the addition of the oxide-forming or sulfide-forming material. Zirconium, titanium, vanadium, scandium, yttrium, and aluminum are in general suitable for use as the oxide-forming material.

US Patent:

55088120, Apr 16, 1996

Filed:

Apr 1, 1994

Appl. No.:

8/222603

Inventors:

David K. Stevenson - San Francisco CA
Henry N. Kannapell - Gainesville GA
Lawrence F. Heyl - Mountain View CA

Assignee:

Apple Computer, Inc. - Cupertino CA

International Classification:

H04N 979
H04N 700
H04N 1100

US Classification:

358310

Abstract:

A system for processing and recording digitized component television signals onto analog video tape includes a digital color transformation matrix for generating a digital luminance signal, a first digital chrominance signal, and a second digital chrominance signal. The signals are then sample rate reduced, interleaved, and stored in a storage subsystem, which may include a disk array. The storage subsystem allows a constant rate, uninterrupted data stream to be produced. To record the signals onto video tape, the signal data is read from the storage subsystem and separated. A series of digital signal processing elements, coupled to the digital luminance signal (read from the storage subsystem), are used to generate a digital filtered and frequency modulated luminance signal. A second series of digital signal processing elements, coupled to the first and second digital chrominance signals (also read from the storage subsystem), are used to generate a digital low pass filtered and amplitude modulated composite chrominance signal. These signals are combined, then converted into an analog composite recording signal compatible with a predetermined VCR standard.