DAVID FRANCIS MAY
Pilots at Shoshonee Dr, Columbus, IN

6463157, Oct 8, 2002

Dec 28, 1998

09/221356

David F. May - Columbus IN

Analytical Engineering, Inc. - Columbus IN

H04R 2500

381151, 310324, 310800, 381326, 381380, 381190

A bone conduction microphone and speaker mountable in contact with a users head or head area, each utilize a strategically mounted audio transducer that is preferably a piezoelectric ceramic bender. In the case of the speaker, the bender is coupled to an audio transformer which may or may not be potted with the bender within the same housing. Additionally, the speaker bender is mounted on a foam layer either with or without a supporting shelf depending on the desired application. The microphone bender is potted within the housing and includes a JFET and resistor mounted directly to the elements of the bender. The present microphone is designed to create the largest possible acoustic mismatch with air while nearly matching the acoustic impedance to the human skill structure. This attenuates the amount of ambient air noise coupled sound receivable into the microphone by greater than 80 dB. The speaker is designed with acoustic impedance matched for bone conduction sound.

6517475, Feb 11, 2003

Sep 6, 2000

09/656098

Gene W. Brown - Kearney NE
Steven J. Merritt - Kearney NE
Farrell F. Calcaterra - Kearney NE
John H. Beard - Kearney NE
David F. May - Columbus IN
Louis A. Krempel - Columbus IN

Baldwin Filters, Inc. - Kearney NE
Analytical Engineering, Inc. - Columbus IN

B01D 2126

494 24, 494 43, 494 46, 494 49, 494 60, 494 62, 494 82, 494 84, 123196 A, 184 624, 210168

A centrifuge filter for removing soot from engine oil. The centrifuge filter includes a rotor adapted to be rotated inside a centrifuge housing by an electric motor or other means. The rotor preferably includes a reusable aluminum support casing and a disposable plastic cartridge. The plastic cartridge includes a trap with partition walls to prevent wave formation in the rotating liquid contained in the trap. The cartridge includes an annular inlet through its top end, a winding flow path through the cartridge and an outlet at the bottom. The centrifuge housing includes an isolated sealed rotor chamber. Using the venturi effect, air is evacuated from the rotor chamber to provide a partial vacuum to reduce air drag on the rotor. Resilient rubber vibration isolators are used to reduce vibrations and engine induced shock loads from reaching the rotating element. A side oil inlet is provided in the cartridge to receive unfiltered oil at a location offset from the axis of rotation.

6820417, Nov 23, 2004

Nov 27, 2002

10/306044

David F. May - Columbus IN
Charles R. Schenk - Ypsilanti MI
Louis A. Krempel - Columbus IN
H. Lee Fisher - Columbus IN
Angela R. May - Columbus IN

Analytical Engineering, Inc. - Columbus IN

F01N 300

60297, 60274, 60288, 60301, 422169, 422177

An exhaust aftertreatment system for use with an internal combustion engine includes at least one leg having a multi-stage NOx adsorber, with each NOx adsorber stage corresponding to a different temperature range of NOx adsorption. In a multi-pass aftertreatment system, a manifold has at least one inlet and a plurality of outlets. A plurality of legs are connected with a respective manifold outlet. Each leg has a NOx adsorber therein. At least one valve is positioned in association with at least one leg for at least partially opening and closing the at least one leg.

5706251, Jan 6, 1998

Nov 22, 1996

8/755490

David F. May - Columbus IN

Trigger Scuba, Inc. - Columbus IN

H04B 1100

367132

The invention is directed to a scuba diving mouthpiece for supplying air to a diver. The mouthpiece includes a mouth engageable body having at least one biteplate. Each biteplate is adapted for being disposed between and engaged by the teeth of the diver. A sound transducer is associated with the body, and includes a magnetostrictive element with opposing ends. The magnetostrictive element is expandable and contractible in an axial direction in a presence of a magnetic field. A sound conducting member includes a movable distal end and an opposing fixed end. The sound conducting member is operatively connected with one of the ends of the magnetostrictive element at a location between the distal end and the fixed end. The sound conducting member is embedded within the body and configured to receive audio sounds from the connected sound transducer. The sound conducting member is also configured to transmit audio sounds through at least one of the biteplates, whereby the audio sounds may be conducted to the teeth of the diver.

5579284, Nov 26, 1996

Oct 10, 1995

8/541826

David F. May - Columbus IN

H04B 1100

367132

An underwater scuba diver communication system is disclosed which is comprised of an oral bone conduction mouthpiece based sound transmission and conduction device, an oral--mouthpiece based microphone, an ultrasonic sound transmission device, an ultrasonic receiving device and the electronic circuitry required to facilitate the transmission or reception of ultrasound transmitted signals through a water medium. The system is constructed to provide underwater diver voice communication with a modified scuba mouthpiece not unlike in appearance or function from a conventional second stage mouthpiece for a scuba diver breathing apparatus. This mouthpiece can also be configured to provide binaural input and/or output with two different transducers for locating sound direction underwater.

8590505, Nov 26, 2013

Jul 1, 2009

12/992508

Brandon M. Simmons - Seymour IN, US
David F. May - Columbus IN, US
Cheng G. Li - Midland MI, US
Clark H. Cummins - Midland MI, US

Dow Global Technologies LLC - Midland MI

F02B 47/02

123299, 123 27 GE, 123525

A method of operating a combustion ignition engine comprises introducing an amount of a compressibly non-ignitable fuel into the air induction system of a compression ignition engine during the intake stroke of the engine and then injecting an amount of compressibly ignitable fuel (e. g. , Diesel fuel) in the cylinder chamber at a crank angle sufficiently advanced during the compression stroke of the compression ignition engine such that the compressibly ignitable fuel and incompressible non-ignitable fuel ignite and combust such that substantially all of the fuel in the cylinder is combusted, where the amount of compressibly non-ignitable fuel introduced into the cylinder has an energy content that is at least about 50% to at most about 99% of the total energy content of the total amount of fuel introduced.

6213929, Apr 10, 2001

Jul 12, 1999

9/352294

David F. May - Columbus IN

Analytical Engineering, Inc. - Columbus IN

B04B 902, B04B 906

494 24

A centrifugal filter assembly for filtering particulates from engine oil includes a housing with a threaded connector. A filter disposed within the housing is rotatable relative to the housing about an axis of rotation. The filter has an inlet and an outlet for the oil. A filter head includes a mating threaded connector configured to mate with the housing threaded connector. The filter head includes a venturi section in communication with the outlet. The venturi section is configured to create a vacuum within the housing for drawing oil through the outlet. A brushless direct current motor carried by the filter head has a rotatable output shaft coupled with the filter for rotating the filter about the axis of rotation. A controller carried by the filter head controls operation of the motor. The controller includes a printed circuit board disposed within the filter head which carries the motor.

2011020, Sep 1, 2011

Nov 19, 2009

13/122326

Brandon M. Simmons - Seymour IN, US
Cheng G. Li - Midland IN, US
David F May - Columbus IN, US

F02B 47/02

123 25 C

A method of operating a spark ignition engine comprises introducing a fuel comprised of a water soluble organic compound and at least 30% by volume water mixed in a homogeneous charge air-fuel mixture. The air-fuel mixture is compressed in an engine having a compression ratio of at least about 16, with such compression ratios including the effective compression ratios arising from precompressing the intake air (e.g., turbocharging). The compressed air fuel mixture is then ignited by a spark or like controllable ignition source.

6210311, Apr 3, 2001

Oct 21, 1998

9/176689

David F. May - Columbus IN

Analytical Engineering, Inc. - Columbus IN

B04B 906

494 24

A centrifugal filter assembly for filtering particulates from a fluid includes a rotating filter disposed within a housing and rotatable relative to the housing about an axis of rotation. A turbine is attached to the filter and includes a plurality of turbine blades extending generally radially relative to the axis of rotation. A nozzle having an outlet is aligned relative to the turbine, whereby a pressurized fluid which is jetted from the nozzle impinges upon the turbine and causes the filter to rotate about the axis of rotation.

5889730, Mar 30, 1999

Jan 5, 1998

/002824

David F. May - Columbus IN

Trigger Scuba, Inc. - Columbus IN

H04B 1100

367132

An underwater audio communication system to be worn by a diver is connected with and carried by a conventional face mask such that bone conduction occurs through the mastoid bone of the diver (i. e. , behind the ear of the diver). The underwater audio communication system includes a face mask with a head strap for placement behind the head of the diver. A transceiver which is connected with and carried by the head strap is configured for receiving and transmitting ultrasonic signals in the water. At least one bone conduction transducer assembly is connected with and carried by the head strap at a location for placement against a mastoid bone of the diver. Each bone conduction transducer assembly is electrically connected with the transceiver.