US Patent 7009513 - Inherently deployable warning to alarm of an opening into the top of a sub-grade structure

Inherently deployable warning to alarm of an opening into the top of a sub-grade structure

Page 1

Document Number

US Patent 7009513

Issued Date

March 7, 2006

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Inventors

Dang; Nguyen Thai (Pomona, CA)

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Abstract

A signal to warn of the open condition of a sub-grade vault whose lid may be open or missing. A spring-loaded placard is held down in the vault by a closed lid and raises above the opening by its own stored energy when the lid is open or missing.

Owner

Carson Industries, LLC (Glendora, CA)

Published

March 7, 2006

Application Number

10/746,186

Filed

December 24, 2003

US Classification

340/545.1 116/270 340/540 40/608

Int'l Classification

G08B 13/08 (20060101)

Examiner

Hofsass; Jeffery

Assistant Examiner

Bugg; George A

Attorney/Law Firm

Mon; Donald D.

USPTO Field of Search

340/545.1 40/608 116/63R

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