Robert F Dvorak

D553350, Oct 23, 2007

Mar 10, 2006

29/255623

Robert J. Dvorak - Justice IL, US

0301

D 3217

8016173, Sep 13, 2011

Jan 17, 2008

12/015851

Robert J. Dvorak - Justice IL, US

A45F 3/04

224653, 224655, 224630, 224580, 383 38

An apparatus for carrying concrete finishing tools comprised of: a front panel, a rear panel, first and second side panels, and a bottom in which the front panel, rear panel, side panels, and bottom form an inner compartment with having an opening to allow access to the inner compartment, a flap extending over the opening, a locking mechanism for temporarily securing the flap to the front panel, at least one shoulder strap to allow the user to carry the apparatus without using their hand(s), and a divider separating the inner compartment into first and second portions.

62599968, Jul 10, 2001

Aug 5, 1998

9/129685

Andy A. Haun - Cedar Rapids IA
Alan G. Coats - Cedar Rapids IA
Kon B. Wong - Cedar Rapids IA
Robert F. Dvorak - Mount Vernon IA
Gary W. Scott - Mount Vernon IA

Square D Company - Palatine IL

H02H 310

702 58

An arc fault detector system detects arcing faults in an electrical distribution system by monitoring one or more conductors and producing an input signal representing one or more electrical signal conditions in the circuit to be monitored. This input signal is processed to develop signals representing the electrical current flow through the monitored circuit and broadband noise signal components. The system analyzes these signals to determine whether an arcing fault is present, and if so, outputs a trip signal which may be used directly or indirectly to trip a circuit breaker or other circuit interruption device.

47149752, Dec 22, 1987

Apr 5, 1985

6/720130

Robert F. Dvorak - Mount Vernon IA

Square D Company - Palatine IL

H02H 316

361 44

A self-contained test feature for ground fault protection systems in circuit breakers. The ground fault protection system includes a sensing transformer having a primary winding that sums the currents through the phase current transformers. Upon the occurrence of an actual ground fault, the sensing transformer will transmit a signal to cause the breaker to trip. The test feature includes a test transformer having its secondary winding electrically connected in parallel with the primary winding of the sensing transformer. The current path between the test transformer secondary winding and sensing transformer primary winding is completed only upon the activation of a test switch. The primary winding of the test transformer is hooked to an external current source to provide the necessary current to simulate the ground fault.

46381333, Jan 20, 1987

Apr 5, 1985

6/720219

Robert F. Dvorak - Mount Vernon IA
Charles E. Netolicky - Cedar Rapids IA

Square D Company - Palatine IL

H01H 904
H01H 308

2003021

A rotary switch is provided by a molded knob having a circular top portion, a circular bottom portion and a circumferential flange between the top and bottom portion. The bottom portion includes a recess which is provided with a pair of crush ribs provided to secure a rotary switch pin within the recess. A circumferential channel is provided on the flange around the top portion of the knob with a stop tab provided in the channel. The molded knob is operatively associated with a top plate and a bottom plate, each plate including a plurality of apertures which receive a respective top portion of a molded knob. The bottom plate is provided with an offset portion which spaces the apertures in the bottom plate a predetermined distance from the apertures in the top plate, with dimples provided in the bottom plate to maintain a predetermined spacing of the plates at the locations of the apertures. The apertures in the top plate are sized to fit closely around the top portion of the molded knob while the apertures in the bottom plate are sized greater than the dimensions of the apertures in the top plate and less than the dimensions of the circumferential flange, with lock tab of being provided on the bottom plate and extending into each bottom aperture and providing a stop surface against which the stop tab will abut upon sufficient rotation of the knob. The top portion of the knob is provided with a slot which can be operated by a screwdriver or similar tool to move the knob to any of its available positions which is designated by an embossed arrow on the top of the knob.

46810617, Jul 21, 1987

Apr 5, 1985

6/720209

Robert F. Dvorak - Mount Vernon IA
Charles E. Netolicky - Cedar Rapids IA
Neil R. Palmer - Swisher IA

Square D Company - Palatine IL

G08B 502

116279

A flush mounted indicating button assembly and operating button assembly each connected to a cover having a pair of holes which receive identical buttons of the assemblies. Each button includes a circular head portion having a flat top surface and a circular base portion having a lesser diameter than the head portion which has a flat bottom surface and defines a collar portion at the bottom of the head portion. The base portion of each bottom is provided with a circumferential channel adjacent the bottom surface which carries a retaining ring. The indicator button is positioned within the hole by a leaf spring member which is connected to the bottom surface of the cover and includes an opening shaped and dimensioned to permit passage of the base portion while preventing passage of the head portion of the button. The opening is in registration with the hole in the cover and a helical coil encircles the base portion intermediate the leaf spring member and the retaining ring. The hole through which the operating button extends is provided with an annular lip adjacent the bottom surface of the cover with a coil spring captured between the collar portion of the button and the annular lip while the retaining clip is engaged with the bottom surface of the cover to prevent further upward movement of the button.

46316248, Dec 23, 1986

Nov 2, 1984

6/667928

Robert F. Dvorak - Mount Vernon IA
Harley W. Jansen - Marion IA
Henry J. Zylstra - Alburnette IA

Square D Company - Palatine IL

H02H 3247

361 89

A time delay undervoltage release for an electric circuit breaker causes the circuit breaker to trip when the control voltage drops below an acceptable level and prevents the breaker from being closed until the control voltage rises to a predetermined level. When the control voltage drops below an acceptable level, the undervoltage release energizes a trip solenoid to trip the breaker. A variable delay is interposed between the control voltage dropping below the acceptable level and the trip solenoid being energized. At the same time the trip solenoid is energized, an inhibit solenoid is deenergized to block the operation of the push-to-close button. When the control voltage increases to a predetermined level, the inhibit solenoid is energized, allowing the push-to-close button to be manually operated and the breaker returned to service.

51989565, Mar 30, 1993

Jun 19, 1992

7/901320

Robert F. Dvorak - Mount Vernon IA

Square D Company - Palatine IL

H02H 504

361106

An overtemperature sensing and signaling circuit for electronic trip units includes a voltage divider (16) and a trigger circuit (18). The voltage divider is formed of a first resistor (R1) and a positive coefficient resistor (PT1). The trigger circuit is formed of a first bipolar transistor (Q1) of the PNP-type conductivity and a second bipolar transistor (Q2) of the NPN-type conductivity.