Randall Dean Olson

US Patent:

6722927, Apr 20, 2004

Filed:

May 28, 2003

Appl. No.:

10/446457

Inventors:

Christopher L. Eriksen - Saint Paul MN
James L. Gravel - Prior Lake MN
Randall C. Olson - Prior Lake MN
David Strei - Waconia MN

Assignee:

Rosemount Inc. - Eden Prairie MN

International Classification:

H01R 13405

US Classification:

439736, 73756

Abstract:

An electrical connector protects a pressure sensor stem that protrudes from a pressure sensor capsule. The electrical connector includes a baseplate with a central hole and a peripheral wall joined to the baseplate and protruding below the baseplate. The peripheral wall slidingly engages the pressure sensor capsule as the pressure sensor stem passes through the central hole to protrude above the baseplate. A protective wall joined to the baseplate protrudes above the pressure sensor stem and protects the pressure sensor stem. A lead frame in the protective wall provides electrical connections to sensor contact pads on the pressure sensor stem.

US Patent:

58724940, Feb 16, 1999

Filed:

Jun 27, 1997

Appl. No.:

8/884536

Inventors:

Donald Palan - Chaska MN
Dennis Smith - Minnetonaka MN
Randall C. Olson - Prior Lake MN

Assignee:

Rosemount Inc. - Eden Prairie MN

International Classification:

H01P 108
G01F 23284

US Classification:

333252

Abstract:

A waveguide assembly for a process sealed level gage includes first and second waveguide portions, a process sealing cavity and a mechanical barrier. The first waveguide portion has a first waveguide bore. The second waveguide portion is fastened to the first waveguide portion and has a second waveguide bore which is axially aligned with the first waveguide bore for communicating microwave signals at a waveguide wavelength. lambda. sub. G between the waveguide bores. The process sealing cavity is formed at an interface between the first and second waveguide portions. The mechanical barrier includes a first shaft section positioned within the first waveguide portion, a second shaft section positioned within the second waveguide portion and a raised annular shoulder positioned at the interface, within the process sealing cavity. The raised annular shoulder has a width, which is measured radially outward from an outside diameter of the shaft sections, of approximately 1/2. lambda. sub. G and a height, which is measured axially between the first and second waveguide portions, of approximately 1/4. lambda. sub. G.

US Patent:

63253917, Dec 4, 2001

Filed:

Apr 28, 1999

Appl. No.:

9/301419

Inventors:

Dennis J. Smith - Minneapolis MN
Randall C. Olson - Prior Lake MN
Steven D. Kruse - Bloomington MN

Assignee:

Rosemount Inc. - Eden Prairie MN

International Classification:

F16J 1508

US Classification:

277650

Abstract:

A process seal made of a material such as polytetrafluoroethylene is used as a microwave window in a radar tank level gauge. The periphery of the process seal is surrounded by a metal containment ring that is fitted to the periphery to limit the amount of expansion outwardly of the process seal material as well as provide for localized loading at the periphery for clamping pressures on the seal. Electromagnetic radiation shielding is provided not only by the containment ring, but also by an EMI shielding O-ring mounted in a groove on a sealing end of the containment ring. A process environmental O-ring is carried by the process seal in an outer shoulder groove that is enclosed by the containment ring.

US Patent:

52722970, Dec 21, 1993

Filed:

Nov 23, 1992

Appl. No.:

7/979922

Inventors:

Matt Reichow - St. Paul MN
Randall M. Olson - Plymouth MN

Assignee:

General Electric Company - New York NY

International Classification:

H01H 1506
H02B 108

US Classification:

200549

Abstract:

An air conditioning disconnect switch utilizes a ramped movable contact arrangement for slidably opening and closing the switch contacts without the requirement of a removable type pull-out handle. A plastic face plate covering the switch terminals allows the use of a metallic case of reduced depth. The slidable contact arrangement eliminates the bumped cover projection otherwise required with the pull-out handle.