Richard D Primdahl

US Patent:

58338497, Nov 10, 1998

Filed:

Apr 28, 1997

Appl. No.:

8/848578

Inventors:

Richard D. Primdahl - Hoffman Estates IL

Assignee:

Everpure, Inc. - Westmont IL

International Classification:

B01D 2700

US Classification:

210232

Abstract:

A spout-mounted water filter assembly suitable for use with a shallow sink having a short necked spout. The water filter assembly includes a water filter unit and an extension pipe which provides additional vertical clearance between the base of the sink and the outlet of the filter unit. The extension pipe may further be dimensioned to provide additional clearance relative to an inner edge of the sink in order to prevent interference between the water filter unit and the sink. The water filter assembly of the present invention is versatile and may be configured in a variety of orientations to fit a variety of sink/faucet combinations.

US Patent:

50550861, Oct 8, 1991

Filed:

Feb 5, 1990

Appl. No.:

7/475127

Inventors:

Donald E. Raterman - Deerfield IL
Richard D. Primdahl - Hoffman Estates IL
Richard A. Mazur - Naperville IL

Assignee:

Cummins-Allison Corporation - Mt. Prospect IL

International Classification:

G07D 316

US Classification:

453 10

Abstract:

A coin sorter having a rotatable disc includes a brake mechanism for stopping rotation of the disc in response to a predetermined number of counted coins. The disc is driven through a gear train by an electric motor. The brake mechanism includes a first brake mechanism coupled to the motor for stopping rotation thereof, a second brake mechanism coupled to the coin disc for stopping rotation thereof, and a control mechanism for operating the brake mechanisms in a synchronous manner so as to avoid any shock loads upon the gear train due to existence of torque differentials on either ends thereof. The brake mechanisms are adapted to have substantially identical stopping times and are operated in such a manner as to be energized in a substantially instantaneous manner when the braking sequence is initiated.

US Patent:

49214632, May 1, 1990

Filed:

Oct 27, 1987

Appl. No.:

7/113869

Inventors:

Richard D. Primdahl - Hoffman Estates IL
Donald E. Raterman - Deerfield IL

Assignee:

Cummins-Allison Corporation - Mt. Prospect IL

International Classification:

G07D 316

US Classification:

453 3

Abstract:

A coin sorter having a rotatable disc includes a brake mechanism for stopping rotation of the disc in response to a predetermined number of counted coins. The disc is driven through a gear train by an electric motor. The brake mechanism includes an electromagnetic actuating assembly and an armature mounted on the shaft of a motor. Upon energization of the actuating assembly, the armature is drawn into contact with the actuating assembly to provide a braking pressure which halts rotation of the motor and the disc.

US Patent:

58883819, Mar 30, 1999

Filed:

May 16, 1997

Appl. No.:

8/857418

Inventors:

Richard D. Primdahl - Hoffman Estates IL
Dale A. Squier - Oswego IL
John Zabinski - Naperville IL

Assignee:

United States Filter Corporation - Palm Desert CA

International Classification:

B01D 1712
G01F 156

US Classification:

210 87

Abstract:

A faucet mounted water filtration system with a filter life monitor includes a filter housing with a flexible cap which deflects upon introduction of water into the housing. The deflection of the cap closes a switch on an electrical circuit which counts the time the water is flowing through the housing. Once a predetermined amount of time accumulates, the circuit generates a message to inform the user that the filter needs replacement. The invention further includes a selector switch on the electrical circuit for signaling the circuit to count one of two predetermined amounts of time prior to generating a message.

US Patent:

RE349348, May 9, 1995

Filed:

Oct 6, 1993

Appl. No.:

8/132715

Inventors:

Donald E. Raterman - Deerfield IL
Richard A. Mazur - Naperville IL
Richard D. Primdahl - Hoffman Estates IL

International Classification:

G07D 316

US Classification:

453 10

Abstract:

A coin sorter having a rotatable disc includes a brake mechanism for stopping rotation of the disc in response to a predetermined number of counted coins. The disc is driven through a gear train by an electric motor. The brake mechanism includes a first brake mechanism coupled to the motor for stopping rotation thereof, a second brake mechanism coupled to the coin disc for stopping rotation thereof, and a control mechanism for operating the brake mechanisms in a synchronous manner so as to avoid any shock loads upon the gear train due to existence of torque differentials on either ends thereof. The brake mechanisms are adapted to have substantially identical stopping times and are operated in such a manner as to be energized in a substantially instantaneous manner when the braking sequence is initiated.

US Patent:

45262047, Jul 2, 1985

Filed:

May 17, 1982

Appl. No.:

6/378666

Inventors:

Richard D. Primdahl - Gurnee IL

Assignee:

Dresser Industries, Inc. - Dallas TX

International Classification:

F16K 3160
F16K 3152

US Classification:

137637

Abstract:

A two lever, three function control apparatus for hydraulic control valves wherein a first control lever end is connected by a first cable to a first hydraulic valve operator, a link perpendicular to the first cable interconnects the first control lever and one leg of a bellcrank rotatable about on axis parallel to the first control lever. A second leg of the bellcrank disposed at right angles to the first leg is connected to a second cable parallel to the first cable which in turn connects to a second hydraulic operator. Fore-and-aft movement of the first control lever actuate only the first cable and hydraulic valve and transverse movement of the first control lever actuates only the second cable and hydraulic valve. To physically differentiate between the two function, the second bellcrank leg is twice the length of the first leg and a detent mechanism acting on the bellcrank hub is also provided. A second control lever is connected by a third cable to a third hydraulic control valve operator.