John R Kuhn

US Patent:

6883519, Apr 26, 2005

Filed:

Oct 10, 2001

Appl. No.:

10/257810

Inventors:

Klaus Schmidtke - Berlin, DE
John F. Kuhn - Wexford PA, US
Wilfried Hoffmann - Berlin, DE

Assignee:

MSA AUER GmbH - Berlin

International Classification:

A62B018/08

US Classification:

12820711, 2 9, 2452

Abstract:

A strap for respirator masks comprises a head strap piece, made from elastically flexible synthetic material, with a strap fixing piece and a head plate with a greater wall thickness than the attached head straps. A neck strap, connected to the mask at two fixing points and an extending temple strap, which may be introduced in a detachable and length adjustable manner into fixing clips attached to the head straps, are fixing to the strap fixing piece. The head strap piece thus consists of a straight and a curved piece. The crown-shaped embodiment with the elastic temple band is associated with good fitting and wearing properties and low maintenance requirements.

US Patent:

41363159, Jan 23, 1979

Filed:

Jul 27, 1977

Appl. No.:

5/819659

Inventors:

John J. Kuhn - Allison Park PA

Assignee:

Westinghouse Air Brake Company - Swissvale PA

International Classification:

H03B 300
H03B 512
H03B 526

US Classification:

331 46

Abstract:

A low frequency modulating signal and a high frequency carrier signal circuit employing a twin-T oscillator having an integrated circuit operational amplifier for producing the modulating signal and an L-C resonant feedback oscillator having a transistor amplifier for producing the carrier signal, and a monitoring shunt regulator for supplying a reference potential to the twin-T oscillator and biasing and operating potentials to the L-C resonant feedback oscillator and for deactivating the L-C resonant feedback oscillator when an increase in resistance occurs in the shunt regulator.

US Patent:

43143741, Feb 2, 1982

Filed:

Nov 10, 1977

Appl. No.:

5/850177

Inventors:

John J. Kuhn - Allison Park PA

Assignee:

Westinghouse Air Brake Company - Swissvale PA

International Classification:

H04B 104

US Classification:

455108

Abstract:

A high power amplitude modulated audio frequency transmitter having a Twin-T low frequency oscillator, a tickler coil high frequency oscillator, a switching regulator and a switching amplifier. The Twin-T low frequency oscillator produces a sine wave modulating signal which is fed to the switching regulator. The tickler coil high frequency oscillator produces a carrier signal which is fed to the input end of the switching amplifier. The output signal of the switching regulator is fed to the output end of the switching amplifier so that a sine wave modulated signal is developed on the output of the switching amplifier.

US Patent:

40604080, Nov 29, 1977

Filed:

Jan 31, 1977

Appl. No.:

5/763829

Inventors:

John E. Kuhn - Lower Burrell PA

Assignee:

Aluminum Company of America - Pittsburgh PA

International Classification:

C22B 2100

US Classification:

75 68R

Abstract:

A process is disclosed for burning hydrocarbons in the vapors emitted from contaminated metallic scrap in a remelt furnace having a molten bath therein. The furnace comprises a charging chamber and a heating chamber separated by a wall. The wall is provided with at least one lower opening and at least one upper opening through which the chambers are in communication above and below the level of molten metal. Scrap is charged into the charging chamber where molten metal ablatively melts the charge. Oil and other surface contaminants evolving from the charge are drawn through the upper opening in the wall into the heating chamber by maintaining a pressure in the heating chamber less than, or negative in relation to, the pressure in the charging chamber. The hydrocarbon vapors burn in the heating chamber and contribute heat of combustion. Controlling the level of pressure differential between the heating chamber and the charging chamber facilitates substantial benefits in efficiency and economy.

US Patent:

45940878, Jun 10, 1986

Filed:

Apr 1, 1985

Appl. No.:

6/718609

Inventors:

John J. Kuhn - Pittsburgh PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C03B 3707

US Classification:

65 1

Abstract:

A bushing controller circuit for regulating the current flow through a fiber glass bushing to thereby control the temperature of the molten glass being drawn into fibers is disclosed. The bushing temperature is measured by a plurality of thermocouples which produce an average temperature reading that is used to control the power fed to the bushing. The bushing controller circuit is a three-terminal device connected across two sections of the bushing to regulate relative current flow in the two sections, in order to control the amount of fiber produced by each section. The bushing controller circuit includes a pair of timing circuits which operate in response to the polarity and magnitude of a control signal, produced at a remote control panel, to control the conductivity of a corresponding pair of current control devices connected across respective sections of the bushing. A reset circuit produces a signal corresponding to the zero crossing of the input AC power to synchronize the timing circuits.

US Patent:

49310755, Jun 5, 1990

Filed:

Aug 7, 1989

Appl. No.:

7/390054

Inventors:

John J. Kuhn - Gibsonia PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C03B 502
C03B 3707

US Classification:

65 1

Abstract:

An improved bushing controller is shown which utilizes an auxiliary transformer in each of the variable impedance circuits in the controller and the bushing tha the controller is connected to increase the current capability of the controller by a significant percentage. Improved performance of fiber glass bushings producing multiple forming packages is realized.

US Patent:

43243762, Apr 13, 1982

Filed:

Jun 24, 1980

Appl. No.:

6/162471

Inventors:

John J. Kuhn - Allison Park PA

Assignee:

American Standard Inc. - Swissvale PA

International Classification:

B61L 102

US Classification:

246125

Abstract:

A railroad highway crossing warning system including pickup coils for sensing current flowing in the track rails of an approach zone, a circuit for sensing the voltage across the track rails, band-pass filter circuits for filtering the voltage and current derived from the track rails, impedance calculator circuits for calculating the track impedance, phase detector circuits for detecting the phase angle between the voltage and current, a multiplier circuit for linearizing the track impedance by multiplying the track impedance by a function of the phase angle, a data sampler circuit for sampling the linearized track impedance at given periodic intervals, a motion detector and crossing predictor circuit for detecting the motion of a train and for predicting the time of arrival at the crossing by comparing the predicted time of arrival with an advanced warning time, and a logic gate circuit for activating the warning apparatus at the crossing when the predicted time of arrival is less than the advanced warning time.

US Patent:

50714597, Dec 10, 1991

Filed:

May 30, 1990

Appl. No.:

7/530681

Inventors:

John J. Kuhn - Gibsonia PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C03B 3707

US Classification:

65 2

Abstract:

A bushing balance controller controls the overall average temperature of a multiple segment glass fiber forming bushing and the temperature of each individual bushing segment. Current shunting loops divert current away from each bushing segment as required to provide the proper bushing segment temperature profile as well as the desired average bushing temperature.