JOHN A MONTGOMERY
Architects in Houston, TX

6206695, Mar 27, 2001

Jan 5, 1999

9/225879

Nelson J. Wong - Carrollton TX
John W. Montgomery - Houston TX

A61C5/02

433102

A step-back eliminating tapered dental cutting instrument for improved root canal treatment and a method of root canal therapy in which the instrument includes a first tapered working portion having spiral-shaped cutting edges which define a first tapered angle, and a second tapered working portion having spiral-shaped cutting edges which define at least one second tapered angle. The second separate tapered angle may have a compound curve taper steeper at the distal tip of the instrument. The root canal therapy method which eliminates the step-back procedure includes the step of using a series of progressively increasing diameter dental cutting tools, each having a first tapered portion at one taper angle, and having a second tapered portion at another steeper angle, which is steeper than the first taper portion, and using each progressively larger diameter dental cutting tool to the same working depth of the previous tool so that a rapid decrease in diameter is achieved at the apical orifice of the root canal.

7789162, Sep 7, 2010

Feb 3, 2006

11/883470

Stuart R. Keller - Houston TX, US
John K. Montgomery - Houston TX, US
Paul M. Spiecker - Manvel TX, US
Bruce A. Dale - Sugar Land TX, US

ExxonMobil Upstream Research Company - Houston TX

E21B 7/04

166386, 166313, 175 22, 175 61

Methods for installing tubulars into a highly deviated wellbore may include a) drilling the well to the planned total depth of the interval, b) placing a first fluid into the wellbore below a prescribed measured depth in the high-angle portion of the wellbore, c) placing a second fluid into the wellbore above the prescribed measured depth, d) plugging the distal port ion of the tubular with a lower plug and an upper plug, e) as the tubular is run into the wellbore, placing a lightweight fluid into the plugged section of tubular and a heavy fluid above the plugged section of tubular, and f) running the tubular into the wellbore to the planned total depth. The first fluid has a density that causes the portion of the tubular that extends into the first fluid to become substantially neutrally buoyant, and the second fluid has a density less than the first fluid.

8469120, Jun 25, 2013

Apr 21, 2008

12/594314

Pavlin B. Entchev - Houston TX, US
John H. Jackson - Idaho Falls ID, US
John K. Montgomery - Houston TX, US

ExxonMobil Upstream Research Company - Houston TX

E21B 10/36

175393, 175 57, 175381, 175384

Drill bits are provided. The drill bits are of the fixed-cutter, rotary-type. The drill bits have a plurality of blades having cutting elements disposed therealong. Junk slots are formed between the respective blades. A knife opening is formed in at least two of the junk slots. Preferably, the knife openings are disposed substantially transverse to a longitudinal axis of the drill bit. The drill bit also has one or more ribbon cutters. The ribbon cutters cyclically protrude through knife openings in the junk slots in order to facilitate the fragmentation of cuttings ribbons moving through the junk slots during a drilling operation.