David Waterman, Age 74Palm Springs, CA

5243297, Sep 7, 1993

Apr 23, 1992

7/872499

Allan J. Perkins - La Habra CA
David K. Waterman - Santa Fe Springs CA
Albert L. Cheser - Anaheim CA

Rohrback Cosasco Systems, Inc. - Santa Fe Springs CA

G01R 2702
G01N 1704

324700

An electrical resistance corrosion probe incorporates a temperature sensitive resistor (RTD) that directly measures temperature of the probe and therefore of its environment as corrosion measurements are being made. The temperature sensitive resistor has one end connected to the common junction between the test and reference elements of the corrosion probe and has its other end connected in the common line to the several corrosion measuring circuits, including the test, reference and check circuits.

5653477, Aug 5, 1997

Dec 14, 1994

8/355623

David K. Waterman - Santa Fe Springs CA

Rohrback Cosasco Systems, Inc. - Santa Fe Springs CA

F16L 304

2851361

A high pressure access fitting for a vessel, pipe or like structure includes a body of a material which is weld compatible with the vessel so the fitting may be welded to the wall of the vessel. The fitting includes an internally threaded section made of another material which is a corrosion resistant alloy and which acts to inhibit galvanic corrosion. The threaded section is an insert made of HASTELLOY. RTM. , for example, and is threaded in place within the body with fine threads and with a metallic C-ring seal protecting the axial inner ends of the threads. The outer end projects beyond the body and provides a corner for a fillet weld. In addition, the fine threads of the insert/body connection are protected by a high temperature expandable sealing compound.

5627749, May 6, 1997

Feb 25, 1994

8/201838

David K. Waterman - Chino CA
Steven W. Powell - Houston TX
Budd Sweetman - Fontana CA
Walter J. Maciejewski - Newport Beach CA

Rohrback Cosasco Systems, Inc. - Santa Fe Springs CA

G01N 1704

364422

A tool for monitoring corrosion levels within a wellbore particularly suited for remote monitoring over extended periods. The monitoring tool utilizes a thin wall electrical resistance type corrosion sensor to determine rate of metal loss within the wellbore. The corrosion sensor is preferably made of the same material as the production tubing or drill pipe of the well and is positioned to allows the fluid within the wellbore to flow over the sensor at the same rate as the fluid flows over the tubing. A reference element is incorporated into the corrosion sensor to provide primary temperature compensation. A temperature sensor provides temperature data and allows for secondary temperature compensation for the corrosion sensor. A central processing unit reads and stores the data from the three sensors into solid state memory. The probe records data at programmable time intervals.

5770809, Jun 23, 1998

Jan 13, 1997

8/783585

David K. Waterman - Santa Fe Springs CA

Rohrback Cosasco Systems, Inc. - Santa Fe Springs CA

G01N 1700

738665

A probe assembly system for high pressure insertion and retrieval in pressure vessels includes a stuffing box fitting with an integrally formed collet which surrounds a probe or device passing axially therethrough. The collet fingers are externally taper threaded and an internally taper threaded collet lock nut locks and releases the collet with minimal rotation. The interior of the collet fingers have teeth which bite into the shank of the probe or device. A single acting hand pump operated tool is quickly attached to the fitting. The tool includes a piston and cylinder with an elastic cord spring return inside the cylinder and attached to the piston in sling shot fashion. The lower end of the tool includes a socket for the collet lock nut which can be tightened and released by axial rotation of the tool. The lower end also includes a window and piston stop. The piston can be attached to the probe, if required.

4841787, Jun 27, 1989

Oct 18, 1988

7/262174

David K. Waterman - Chino CA

Rohrback Cosasco Systems, Inc. - Santa Fe Springs CA

G01F 1518

738665

A retractor tool adapted to insert and retrieve sensing, measuring or control devices in high pressure containers, such as a pipeline, through an access valve and stuffing box without interrupting the fluid flow within the vessel or relieving the pressure. The tool is connected to the stuffing box by a clamshell clamp which utilizes the threaded rod of the apparatus at its hinge axis. The measuring device is inserted or retracted by the operation of a thrust coupling on the retractor threaded rod. Translational movement is imparted to the thrust coupling by means of a handle nut. The retractor tool can be attached to both hex stuffing boxes and cylindrical stuffing boxes.

5639975, Jun 17, 1997

Jul 23, 1996

8/685394

David K. Waterman - Santa Fe Springs CA

Rohrback Cosasco Systems, Inc. - Santa Fe Springs CA

G01N 1700

738665

A probe assembly system for high pressure insertion and retrieval in pressure vessels includes a stuffing box fitting with an integrally formed collet which surrounds a probe or device passing axially therethrough. The collet fingers are externally taper threaded and an internally taper threaded collet lock nut locks and releases the collet with minimal rotation. The interior of the collet fingers have teeth which bite into the shank of the probe or device. A single acting hand pump operated tool is quickly attached to the fitting. The tool includes a piston and cylinder with an elastic cord spring return inside the cylinder and attached to the piston in sling shot fashion. The lower end of the tool includes a socket for the collet lock nut which can be tightened and released by axial rotation of the tool. The lower end also includes a window and piston stop. The piston can be attached to the probe, if required.

4537071, Aug 27, 1985

Nov 23, 1983

6/554317

David K. Waterman - Placentia CA

Rohrback Corporation - Seattle WA

G01D 2100

73432R

A tool for retrieving or placing test or process elements from and into a pressurized container has a relatively short run in/run out shaft that carries a connector for attachment to and rotation of a holder that mounts a test probe, test coupon, or the like, in the container. The run in/run out shaft is driven by a pair of concentric drive cylinders, rotation of the shaft being achieved by a longitudinally slotted rotation drive cylinder, and longitudinal motion of the shaft being achieved by rotation of a spirally slotted cam cylinder. The arrangement provides a shorter length tool and eliminates gears and close-fitting drive elements that are subject to wear and damage from trash that may be contained in the fluid of the system.

5621181, Apr 15, 1997

Jul 18, 1995

8/503883

David K. Waterman - Santa Fe Springs CA

Erico International Corporation - Solon OH

G01N 1700

738665

A probe assembly system for high pressure insertion and retrieval in pressure vessels includes a stuffing box fitting with an integrally formed collet which surrounds a probe or device passing axially therethrough. The collet fingers are externally taper threaded and an internally taper threaded collet lock nut locks and releases the collet with minimal rotation. The interior of the collet fingers have teeth which bite into the shank of the probe or device. A single acting hand pump operated tool is quickly attached to the fitting. The tool includes a piston and cylinder with an elastic cord spring return inside the cylinder and attached to the piston in sling shot fashion. The lower end of the tool includes a socket for the collet lock nut which can be tightened and released by axial rotation of the tool. The lower end also includes a window and piston stop. The piston can be attached to the probe, if required.