Robert Alan Sheldon

US Patent:

62714996, Aug 7, 2001

Filed:

Sep 14, 1999

Appl. No.:

9/395502

Inventors:

Marshall Gordon Jones - Scotia NY
Robert Gerard Sheldon - Woodstock GA
Carl Edward Erikson - Schenectady NY

Assignee:

Lockheed Martin Corp. - Bethesda MD

International Classification:

B23K 2600

US Classification:

21912164

Abstract:

A method for welding a first metallic material to a second metallic material where at least one of the first and second metallic materials have at least one surface which has an optical pattern thereon. The method comprises the steps of: arranging the first and second metallic materials into a final position in which they will be welded along a joint; directing focused energy at the joint from a Nd-YAG pulsed laser having an energy output in a range from about 10 Joules to about 30 Joules and a pulse length in a range from about 5 ms to about 9 ms; and traversing the joint at a predetermined welding speed while directing the focused energy such that a weld spot overlap in a range from about 50% to about 90% is maintained, resulting in a welded joint wherein a heat effect zone about the welded joint is minimized further resulting in minimal distortion and damage to an area of the optical pattern proximate to the welded joint. Also provided is a method for repairing any weld defects in the welded joint with the same Nd-YAG pulsed laser.

US Patent:

20170286354, Oct 5, 2017

Filed:

Jun 21, 2017

Appl. No.:

15/629293

Inventors:

- Redwood City CA, US
Matthew Cohen - Cambridge MA, US
Rahoul Puri - Los Altos CA, US
Tayfun Kocaoglu - Los Gatos CA, US
John Johnson - San Jose CA, US
David Kahn - Makawao HI, US
Alan Adamson - San Diego CA, US
Sriram Jayakumar - Lexington MA, US
Julia Harper - Arlington MA, US
Robert G. Sheldon - Duxbury MA, US
Mark Kanda - Austin TX, US

International Classification:

G06F 13/42
G06F 9/455
G06F 13/36

Abstract:

An apparatus and method for controlling a device with shared hardware resources to provide separate execution environments for control and data functions are disclosed. A processor may be configured to generate a first request to access control functions of the device in response to execution of a first thread, and generate a second request to access data functions of the device in response to execution of a second thread. A communication unit may send first indicative of the first request and second data indicative of the second request to the device via first and second ports, respectively.