Thomas R. Bishop
Engineering at Viking Dr, Houston, TX

4877217, Oct 31, 1989

Oct 27, 1988

7/263519

Archie W. Peil - Houston TX
Thomas R. Bishop - Houston TX

Bowen Tools, Inc. - Houston TX

F16K 3100

251 13

A fail-safe mechanism for closing the rams in a conventional blowout preventer. The mechanism includes a ram shaft having an enlarged outer end that is exposed to well pressure which exerts a constant closing force. The closing force is opposed by a hydraulic fluid chamber which is evacuated in the event of fire, etc. A floating plug within the ram shaft helps prevent leaks of well fluid from the blowout preventer.

4398729, Aug 16, 1983

Dec 20, 1982

6/450999

Thomas R. Bishop - Houston TX
Archie W. Peil - Houston TX

Bowen Tools, Inc. - Houston TX

F16J 1556, E21B 3306

277 73

A new and improved inner seal assembly adapted to be mounted with the ram of a blowout preventer which includes a central sealing member and a seal insert, with the central sealing member being formed having at least one securing member receptacle capable of receiving a securing member formed with the seal insert, with the seal insert being removably mounted with the central sealing member by yieldable cooperation between the seal insert and the central sealing member.

4331006, May 25, 1982

Jul 1, 1980

6/165200

Thomas R. Bishop - Houston TX

Bowen Tools, Inc. - Houston TX

F16D 306, E21B 1700

464 18

A shock absorber assembly for absorbing shocks encountered by a drill string having a working fluid flowing therethrough wherein the shock absorber assembly includes a housing affixed to the drill string, a mandrel mounted for reciprocal longitudinal movement with respect to the housing, and a fluid dampening member replaceably sandwiched between the mandrel and housing for absorbing shocks transmitted between the mandrel and the housing during drilling operations.

4456215, Jun 26, 1984

May 7, 1982

6/375961

Thomas R. Bishop - Houston TX
Arnal B. Foreman - Houston TX

Bowen Tools, Inc. - Houston TX

E21B 3306

251 1B

A new and improved inner seal and support rod assembly for a blowout preventer including an inner seal assembly for improved sealing and configured to promote ease of maintenance and removal thereof in cooperation with substantially horizontally disposed, vertically aligned support rods of the blowout preventer.

3987858, Oct 26, 1976

Jun 23, 1975

5/589058

Damon T. Slator - Houston TX
Archie W. Peil - Houston TX
Thomas R. Bishop - Houston TX

Bowen Tools, Inc.

E21B 110

175297

An improved hydromechanical drilling jar for applying upward and downward jarring blows to an object stuck in a well wherein the jar comprises a mechanically operated jar section which is connected with a hydraulically operated jar section by flexible tubular connector means for providing flexibility therebetween for relieving bending moments on the jar sections during use. The jar sections are separable for ease in storage and transportation and may be relatively positioned in a drill string as desired.

4369977, Jan 25, 1983

Dec 1, 1980

6/211522

Thomas R. Bishop - Houston TX
Archie W. Peil - Houston TX

Bowen Tools, Inc. - Houston TX

F16J 1532

277 1

A new and improved seal for an overshot and method for doing same wherein the seal includes a seal ring body mounted with the overshot, the seal ring body having a first and second sealing lip formed therewith and extending inwardly into the bore of the overshot, with the first sealing lip for initially engaging the tubular member to reduce fluid flow therebetween and the second sealing lip, spaced above the first sealing lip, for establishing a fluid-tight relation between the second sealing lip and the tubular member for preventing fluid flow therebetween.

4706745, Nov 17, 1987

Dec 15, 1986

6/941617

Thomas R. Bishop - Houston TX
Wayne A. Kovar - Houston TX
Clyde D. Roque - Houston TX

Bowen Tools, Inc. - Houston TX

E21B 3120

166 98

An apparatus for engaging a tubular member with a tension type spear in which the spear is locked to the tubular member so that it is not released when compressive or other non-tension loads are applied to it. The present invention locks the spear to the tubular member through abutment of a transfer assembly connected to the spear supporting mandrel after the spear has been set within the tubular member. The abutment of the transfer assembly and the tubular member lock the spear within the tubular member under tension so that compressive or other non-tension loads on the supporting pipe string will not affect the grip of the spear.

4076436, Feb 28, 1978

Feb 5, 1976

5/655442

Damon T. Slator - Houston TX
Archie W. Peil - Houston TX
Thomas R. Bishop - Houston TX

Bowen Tools, Inc.

F16B 718, E21B 17042

403343

Specially designed stress relief grooves for threaded end portions of tools and for collars on reciprocating or rotating drill string mounted tools.

4027816, Jun 7, 1977

Apr 18, 1975

5/569370

Damon T. Slator - Houston TX
Thomas R. Bishop - Houston TX
Archie W. Peil - Houston TX

Bowen Tools, Inc.

F16J 1524

277188R

An improved seal assembly for sealing between relatively movable members in an oil tool or the like including a split protective ring held in position by a seal ring having a circumferential locking shoulder.

4648447, Mar 10, 1987

Sep 11, 1985

6/774890

Thomas R. Bishop - Houston TX
Archie W. Peil - Houston TX
Arnal B. Foreman - Houston TX

Bowen Tools, Inc. - Houston TX

E21B 3702

166173

A casing scraper which provides substantially 360. degree. of contact between the interior diameter of casing. The cutter blades of the casing scraper are of a segmented tubular shape to provide a substantially 360. degree. contact area. The segmented cutter blades are biased radially outwardly by springs oriented in an alignment housing between the supporting mandrel and the cutter blades.