John M Cronk

US Patent:

D466106, Nov 26, 2002

Filed:

Jun 4, 2001

Appl. No.:

29/142898

Inventors:

John M. Cronk - Barrington NH

Assignee:

Russound/FMP, Inc. - Newmarket NH

International Classification:

1499

US Classification:

D14217

US Patent:

D481706, Nov 4, 2003

Filed:

Aug 8, 2002

Appl. No.:

29/165366

Inventors:

Allen Boothroyd - Cambridge, GB
William Ramsdell - Barrington NH
Andrew Lewis - Lee NH
John Cronk - Strafford NH
Joshua Cooper - Rochester NH

Assignee:

Russound/FMP, Inc. - Newmarket NH

International Classification:

1499

US Classification:

D14217

US Patent:

8189753, May 29, 2012

Filed:

Apr 10, 2008

Appl. No.:

12/082408

Inventors:

John M. Cronk - Strafford NH, US
George W. Ramsdell - Barrington NH, US

Assignee:

Russound/FMP Incorporated - Newmarket NH

International Classification:

H04M 1/00
H04M 1/60
H04M 9/00

US Classification:

379159, 37916705, 37916708, 37916714

Abstract:

A distributed intercom system that interconnects a hub and various keypad and door zone units having microphones and/or speakers via CAT5 or similar cable having multiple twisted pairs. Audio is carried between all devices over a first audio wire pair, in analog signal format, forming an audio bus. Audio twisted pair acts as a data communication bus for control messages. One or more of receiver units may be active, while only one keypad device can be individually instructed to connect its corresponding microphone circuit to the audio bus. Determination of which unit is selected to be the transmitter occurs under the control of the hub. For example, in a case where a first user wishes to speak to another user in a different room, the first user presses a “talk” button at his keypad, causing that keypad to send out a message on a data communication bus to the hub. The hub unit then sends a reply on the data communication bus that grants permission to the first user's keypad to couple its microphone to the audio bus. The message is interpreted by the other stations as an instruction to keep their own microphones disconnected from the bus.

US Patent:

D4450957, Jul 17, 2001

Filed:

Oct 31, 2000

Appl. No.:

D/132002

Inventors:

Oscar A. Ciornei - Portsmouth NH
Joshua M. Cooper - Portsmouth NH
John M. Cronk - Barrington NH
G. William Ramsdell - Barrington NH
Jeffrey D. Myatt - Manchester NH

Assignee:

Russound/FMP, Inc. - Newmarket NH

International Classification:

1303

US Classification:

D13164

US Patent:

D4524853, Dec 25, 2001

Filed:

Oct 31, 2000

Appl. No.:

D/131996

Inventors:

Oscar A. Ciornei - Portsmouth NH
Joshua M. Cooper - Portsmouth NH
John M. Cronk - Barrington NH
G. William Ramsdell - Barrington NH
Jeffrey D. Myatt - Manchester NH

Assignee:

Russound/FMP, Inc. - Newmarket NH

International Classification:

1303

US Classification:

D13164

US Patent:

D4447743, Jul 10, 2001

Filed:

Oct 31, 2000

Appl. No.:

D/131963

Inventors:

Oscar A. Ciornei - Portsmouth NH
Joshua M. Cooper - Portsmouth NH
John M. Cronk - Barrington NH
G. William Ramsdell - Barrington NH
Jeffrey D. Myatt - Manchester NH

Assignee:

Russound/FMP, Inc. - Newmarket NH

International Classification:

1303

US Classification:

D13164

US Patent:

D4447751, Jul 10, 2001

Filed:

Oct 31, 2000

Appl. No.:

D/131995

Inventors:

Oscar A. Ciornei - Portsmouth NH
Joshua M. Cooper - Portsmouth NH
John M. Cronk - Barrington NH
G. William Ramsdell - Barrington NH
Jeffrey D. Myatt - Manchester NH

Assignee:

Russound/FMP, Inc. - Newmarket NH

International Classification:

1303

US Classification:

D13164

US Patent:

D4454065, Jul 24, 2001

Filed:

Oct 31, 2000

Appl. No.:

D/131966

Inventors:

Oscar A. Ciornei - Portsmouth NH
Joshua M. Cooper - Portsmouth NH
John M. Cronk - Barrington NH
G. William Ramsdell - Barrington NH
Jeffrey D. Myatt - Manchester NH

Assignee:

Russound/FMP, Inc. - Newmarket NH

International Classification:

1303

US Classification:

D13164