Christopher D Baldwin

US Patent:

6512450, Jan 28, 2003

Filed:

Jan 20, 2000

Appl. No.:

09/488693

Inventors:

George Alan Burnett - Clayton IN
Christopher Michael Baldwin - Indianapolis IN

Assignee:

Mallory Sonalert, Products, Inc. - Indianapolis IN

International Classification:

G08B 300

US Classification:

3403841, 3403846, 381339, D10120

Abstract:

The invention is an improved piezoelectric noise-making and audible signaling device which produces a distinctive 2 KHz tone that is more pronounced and significantly easier to perceive, especially in a noisy environment. The volume of the audible tone is amplified by using two or three sound-amplifying chambers or cavities.

US Patent:

6617967, Sep 9, 2003

Filed:

Jan 10, 2001

Appl. No.:

09/758023

Inventors:

Christopher Baldwin - Indianapolis IN
George Burnett - Clayton IN
Daniel OBrien - Mooresville IN

Assignee:

Mallory Sonalert Products, Inc. - Indianapolis IN

International Classification:

G08B 310

US Classification:

3403846, 3403841, 3403844, 34038473, 340692, 381150, 381190

Abstract:

A piezoelectric transducer driving circuit has a main oscillator stage, a buffer circuit, and a voltage-doubling circuit. The main oscillator stage includes a frequency-swept signal generator that can be configured to provide different outputs to the buffers, which in turn provide the output to the voltage-doubling circuit, which supplies the piezoelectric transducer, causing it to mechanically deform and produce audible sounds of different types.

US Patent:

6756883, Jun 29, 2004

Filed:

Nov 12, 2002

Appl. No.:

10/293957

Inventors:

George Alan Burnett - Clayton IN
Christopher Michael Baldwin - Indianapolis IN

Assignee:

Mallory Sonalert Products, Inc. - Indianapolis IN

International Classification:

G08B 300

US Classification:

3403841, 3408346, 381338, 381339, D10120

Abstract:

The invention is an improved piezoelectric noise-making and audible signaling device which produces a distinctive 2 KHz tone that is more pronounced and significantly easier to perceive, especially in a noisy environment. The volume of the audible tone is amplified by using two or three sound-amplifying chambers or cavities.

US Patent:

7880593, Feb 1, 2011

Filed:

Feb 5, 2008

Appl. No.:

12/012695

Inventors:

Christopher M. Baldwin - Avon IN, US
Daniel O'Brien - Mooresville IN, US
Mark T. Monnett - Cloverdale IN, US

Assignee:

Mallory Sonalert Products, Inc. - Indianapolis IN

International Classification:

G10K 9/20

US Classification:

3403884, 3403881, 3403841

Abstract:

The invention is an improved audible signaling device with a speaker, a sound chamber, and associated circuitry. The device creates a loud, audible fundamental frequency, and harmonic frequencies that are relatively equal in amplitude to the amplitude of the fundamental frequency.

US Patent:

20020141135, Oct 3, 2002

Filed:

Mar 30, 2001

Appl. No.:

09/821363

Inventors:

Dennis Henderson - Indianapolis IN, US
Christopher Baldwin - Indianapolis IN, US

International Classification:

H01G004/32

US Classification:

361/301500

Abstract:

A dielectric fluid of refined soybean oil with additives of cycloaliphatic epoxide resin and butylated hydroxtolene covered in the winding of a metallized polypropylene film capacitor to prevent trapped air and moisture being absorbed in the winding.

US Patent:

20100102940, Apr 29, 2010

Filed:

Oct 23, 2008

Appl. No.:

12/288846

Inventors:

Christopher M. Baldwin - Avon IN, US
Joshua K. Brown - Danville IN, US
Mark T. Monnett - Cloverdale IN, US

International Classification:

G08B 3/10

US Classification:

3403846, 3403847

Abstract:

In further development of U.S. Pat. No. 6,310,540 B1, an audible signal device comprising of a microprocessor or microcontroller and a sounder element, or a microprocessor or microcontroller in conjunction with electronic circuitry such as discrete components, inductors, or IC's with a sounder element where the resulting sound pressure level is controlled by changing the drive signal's frequency, size, shape, and/or duty cycle.