Clean Energy Labs, LLC

Active Power, Inc.

Brane Audio, LLC

Ambient Systems, Inc.

Magnetic Bearing Technologies, Inc.

Cjp IP Holdings, Ltd.

Other

Cjp IP Holding, Ltd.

Truss Research, Inc.

Magnetic Bearing Techologies, Inc.

Joseph F Pinkerton

David A Badger

William Neil Everett

William Martin Lackowski

David B Clifton

James A Andrews

Scott R Little

John C Harlan

David E Perkins

Jeffrey David Mullen

David J Beatty

David Lucas

Alexander Joseph Pinkerton

James Hunt

Kwame Appiahene-Agyei

Aaron Vom Eigen

Robert S Hudson

Gail Roberts

William D Batton

Donald M Hudson

Kenneth E Nichols

David Lowe

Philip Keene

James E Dillard

Donald L Stamets

Michael D Forsha

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS). The magnets of the MNS can be arranged for radial stability and/or to provide for linear magnetic forces. A variable reluctance device can be used to vary the resonant frequency of electroacoustic driver in response to a feedback signal.

Loudspeakers and methods of use thereof

Force transducers for use in electrostatic drivers, including electrostatic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers having the force transducers can be used at all audio frequencies, including subwoofer frequencies.

Force transducers for electroacoustic drivers and loudspeakers containing same

Nano-electromechanical systems (NEMS) sensor devices that utilize thin electrically conductive membranes, which can be, for example, graphene membranes. The NEMS devices can have a trough shape (such as a serpentine shape arrangement) of the electrically conductive membrane. The thin, electrically conductive membrane has membrane-structures disposed upon it in an array of cavities. These membrane structures are between the thin, electrically conductive membrane and the main membrane trace. Such an arrangement increases the sensitivity of the NEMS sensor device. The electrically conductive membrane can be controllably wicked down on the edge of the oxide cavity to increase the sensitivity of the NEMS sensor device. Such NEMS sensor devices include NEMS sensor devices that are well suited to applications that measure magnetic fields that, operate below 10 kHz, such as brain-computer interfaces.

Membrane-based nano-electromechanical systems device and methods to make and use same

Voice coil actuators and loudspeakers containing same. The voice coil actuators include moving voice coil assemblies that have multiple segments. Each segment of a moving voice coil assembly is separately controlled by an amplifier, one channel of an amplifier, and combinations thereof utilized in combination with a position sensor that senses the position of the moving voice coil assembly. By this arrangement, the voice coil actuators produce a linear force per unit current throughout the range of motion while obtaining the benefits and advantages associated with both over-hung and under-hung voice coil actuator designs.

Voice coil actuator and loudspeakers containing same

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize bidirectional force electromagnet transducers or piezoelectric transducers. The electroacoustic drivers can include motion amplifiers such as lever arms. The electroacoustic drivers can be used at all audio frequencies including frequencies below 500 Hz.

Electroacoustic drivers and loudspeakers containing same

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers can be used at all audio frequencies, including subwoofer frequencies. The magnetic negative springs of the electroacoustic drivers can cancel, or partially cancel, the large pressure forces on a sound panel (of an audio speaker) so that substantial subwoofer notes can be efficiently and cost effectively produced in small/portable speakers. The electroacoustic drivers can include a stabilizing/centering mechanism to overcome the destabilizing forces of a MNS that are too large for a voice coil alone to produce.

Audio speaker

Nano-electromechanical systems (NEMS) devices that utilize thin electrically conductive membranes, which can be, for example, graphene membranes. The membrane-based NEMS devices can be used as sensors, electrical relays, adjustable angle mirror devices, variable impedance devices, and devices performing other functions. The NEMS devices have a serpentine shape arrangement of the electrically conductive membrane. The electrically conductive membrane can be controllably wicked down on the edge of the oxide cavity to increase sensitivity of the NEMS device.

Pumping systems that have pumping system units utilizing venturi pumps. Such pumping systems can be used in speakers, to propel drones, and other applications. Actuation of the venturi pumps can be by piezoelectric actuators, magnetic actuators, electrostatic actuators, and other similar actuators.

Venturi pump systems and methods to use same

Dipole audio speakers, and more particularly, voice controlled dipole audio speakers having at least one microphone located substantially along the null sound plane of the dipole audio speaker. An improved loudspeaker system that produces an improved audio quality for stereophonic sound. The improved loudspeaker utilizes conventional electro-dynamic drivers in a sealed chamber that produce sound primarily in the 20-300 Hz band coupled with electrostatic card stack drivers placed outside the sealed chamber that cover the remaining 98% of the audio frequency spectrum (300 Hz to 20 kHz). The improved loudspeaker system can also include multiple card stack drivers that are placed at angles with respect to each other to maximize audio fidelity.

Loudspeaker with array of electrostatic card stack drivers

Growing community of inventors

Austin, TX, United States of America

Joseph F Pinkerton