Thomas F Longwell

US Patent:

6377678, Apr 23, 2002

Filed:

Mar 29, 2000

Appl. No.:

09/538580

Inventors:

Thomas F. Longwell - Lincolnshire IL

Assignee:

Knowles Electronics, LLC - Itasca IL

International Classification:

H04M 100

US Classification:

37938701, 379 101

Abstract:

An interface device is provided for (1) automatically diagnosing the type and terminal connections of the earphone and microphone transducers used in any handset or headset and (2) automatically connecting any transducer set provided as a replacement handset or headset to emulate the original handset or headset. Subsequently, the user can connect, without further action, the replacement transducer set to the telephone base station.

US Patent:

7236609, Jun 26, 2007

Filed:

Oct 6, 2000

Appl. No.:

10/089861

Inventors:

Paris Tsangaris - Itasca IL, US
Thomas E. Longwell - Phoenix AZ, US
Thomas E. Miller - Arlington Heights IL, US
Dennis Ray Kirchhoefer - Plainfield IL, US
Daniel M. Warren - Geneva IL, US

Assignee:

Knowles Electronics, LLC. - Itasca IL

International Classification:

H04R 25/00

US Classification:

381417, 381418, 381412

Abstract:

A transducer comprising a pair of spaced magnets at least partially forming a tunnel having a central axis. A coil having a first and a second side wall and an upper and a lower wall at least partially forms the tunnel. A reed having a central portion extends through the tunnel. The reed has a stationary end, a deflection end, and a tip portion which lies at least partially between the magnets, wherein the reed is mounted for deflection towards or away from the respective magnets.

US Patent:

7995789, Aug 9, 2011

Filed:

Jun 21, 2007

Appl. No.:

11/766461

Inventors:

Paris Tsangaris - Itasca IL, US
Thomas E. Longwell - Phoenix AZ, US
Thomas E. Miller - Arlington Heights IL, US
Dennis Ray Kirchhoefer - Plainfield IL, US
Daniel M. Warren - Geneva IL, US

Assignee:

Knowles Electronics, LLC - Itasca IL

International Classification:

H04R 25/00

US Classification:

381418, 381412, 381413

Abstract:

A transducer comprising a pair of spaced magnets at least partially forming a tunnel having a central axis. A coil having a first and a second side wall and an upper and a lower wall at least partially forms the tunnel. A reed having a central portion extends through the tunnel. The reed has a stationary end, a deflection end, and a tip portion which lies at least partially between the magnets, wherein the reed is mounted for deflection towards or away from the respective magnets.

US Patent:

52220508, Jun 22, 1993

Filed:

Jun 19, 1992

Appl. No.:

7/900662

Inventors:

Thomas F. Marren - Justice IL
Thomas F. Longwell - Lincolnshire IL

Assignee:

Knowles Electronics, Inc. - Itasca IL

International Classification:

H04R 1700

US Classification:

367163

Abstract:

An immersion-resistant housing adapted to receive a vibratable diaphragm spanning the interior of the housing to divide the housing into first and second chambers includes a first port communicating between the first chamber and the exterior environment. The first port is configured as a tubulation. A second port communicates between the second chamber and the external environment. The tubulation has sufficiently small diameter that water entering therein moves essentially as a piston without breakup. The tubulation is configured to have a volume at least equal to that of the first chamber, and a hydrostatic head of about 32 feet of water is necessary before water can be forced into the first chamber. In the preferred embodiment the diaphragm completely seals the housing against direct communication between the two chambers. Pressure equalization across the diaphragm under conditions of varying atmospheric pressure is achieved by a selective sealing system permitting passage of air through the second port while preventing the passage of water therethrough at pressures up to at least three and preferably ten meters of hydrostatic head.