Douglas Alan Mitchell

US Patent:

7486227, Feb 3, 2009

Filed:

Aug 23, 2006

Appl. No.:

11/466561

Inventors:

Douglas A Mitchell - Tomball TX, US
William J Teague - Slidell LA, US
Kirk R Whitmer - New Orleans LA, US

Assignee:

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

International Classification:

G01S 13/00
G01S 13/08
G01S 7/40

US Classification:

342120, 342 26 R, 342 26 A, 342118, 342165

Abstract:

A method for correcting bias in altimetry data for ascending satellite tracks and descending satellite tracks. For satellites operating in tandem, calculate ascending track bias between the height measurement made by the first and the second satellites for the ascending tracks in a region, calculate an ascending bias correction by least squares fitting a polynomial to the bias as a function of significant wave height for the ascending tracks, and apply a portion of the ascending track bias to the sea surface height measurements. The correction can be calculated based on only one track and its crossover points. Another embodiment uses data from only one satellite, estimates the sea state bias at the crossover points separately for the ascending and descending tracks, and apportions a percentage of the difference at the crossover points to the tracks based on minimizing the rms differences between the ascending and descending tracks.

US Patent:

20210101664, Apr 8, 2021

Filed:

Sep 11, 2020

Appl. No.:

17/017747

Inventors:

- Spring TX, US
Douglas A. Mitchell - Spring TX, US
Timothy A. Thornton - Tulsa OK, US

International Classification:

B63B 35/32
B64C 39/02
H04W 4/40

Abstract:

A remote survey system includes an unmanned surface vehicle that includes a body, a propulsion system coupled to the body to provide mobility to the unmanned surface vehicle to traverse a surface of a waterbody, and a thickness detection assembly mounted to a hull of the body and including one or more thickness detection cameras. A central computer system is located at a command center and in wireless communication with the unmanned surface vehicle via a communication module. The one or more thickness detection cameras are positioned to obtain one or more images or videos of an air-oil-water interface on the surface of the waterbody, and a thickness of a released substance present on the surface of the waterbody is determined based on the one or more images or videos of the air-oil-water interface.

US Patent:

20190186231, Jun 20, 2019

Filed:

Nov 13, 2018

Appl. No.:

16/189586

Inventors:

Bill R. Meeks - The Woodlands TX, US
Timothy J. Nedwed - Houston TX, US
Douglas A. Mitchell - Spring TX, US
Rachna Jain - Collierville TN, US
Kaustubh S. Kulkarni - The Woodlands TX, US

International Classification:

E21B 33/12
E21B 33/134

Abstract:

Methods of mitigating lost circulation while drilling a wellbore. The methods include circulating a drilling mud to a downhole end of the wellbore via a drill string and, during the circulating, drilling the wellbore with a drill bit of the drill string. The methods also include detecting lost circulation within the wellbore while drilling the wellbore and include providing a monomer solution to the wellbore. The methods further include providing a catalyst to the wellbore responsive to detecting the lost circulation event and combining the monomer solution and the catalyst to polymerize a monomer from the monomer solution, within the wellbore, and forming a viscous plug within the wellbore. Subsequent to the combining, the methods include flowing at least a portion of the viscous plug within the wellbore and into a zone of lost circulation that extends within a subsurface region. The methods further include at least partially occluding fluid flow from the wellbore and into the zone of lost circulation with the viscous plug.

Address:

11748 Skene Way, Houston, TX 77024

Phone:

7134683926

VIN:

1GKFK63887J278601

Make:

GMC

Model:

YUKON DENALI

Year:

2007