Paul Chandler Welling

US Patent:

RE38795, Sep 13, 2005

Filed:

Jan 27, 2003

Appl. No.:

10/352362

Inventors:

Paul C. Welling - Charlestown NH, US
James L. Stopa - Old Saybrook CT, US

Assignee:

Whelen Engineering Company, Inc. - Chester CT

International Classification:

G08B003/00

US Classification:

3406911, 3406913, 340326, 340332, 340471, 340472, 340473

Abstract:

The duration of variations in the potential applied to a single electrical contact, when compared to a reference potential, are measured and employed to command either incrementing or decrementing of an address. The addresses are associated with a table of instructions and an addressed instruction, when read, will produce a discrete warning signal. A desired one of several light flash or audible patterns may be selected by step-wise scrolling through the table in response to manually varying the contact potential.

US Patent:

63170523, Nov 13, 2001

Filed:

Apr 19, 2000

Appl. No.:

9/553459

Inventors:

Paul C. Welling - Killingworth CT
James L. Stopa - Old Saybrook CT

Assignee:

Whelen Engineering Company, Inc. - Chester CT

International Classification:

G08B 300

US Classification:

3406911

Abstract:

The duration of variations in the potential applied to a single electrical contact, when compared to a reference potential, are measured and employed to command either incrementing or decrementing of an address. The addresses are associated with a table of instructions and an addressed instruction, when read, will produce a discrete warning signal. A desired one of several light flash or audible patterns may be selected by step-wise scrolling through the table in response to manually varying the contact potential.