Resources
Contact Us
Home
Browse by:
INVENTOR
PATENT HOLDER
PATENT NUMBER
DATE
Browse by Category:
Main
>
Communications
Class Information
Number:
181/19
Name:
Acoustics
>
Speaking tubes
> Alarms and indicators
Description:
Alarms or indicators of a speaking-tube.
Patents under this class:
Patent Number
Title Of Patent
Date Issued
7525440
Person monitoring
Apr. 28, 2009
5659157
7th order acoustic speaker
Aug. 19, 1997
4825800
Marine horn installation
May. 2, 1989
4669683
Moveable safety railing
Jun. 2, 1987
4505358
Voice communicator
Mar. 19, 1985
Recently Added Patents
Communication apparatus, communication program, storage medium, and method of communication
Glove
Image processing apparatus, image processing method, exposure apparatus, and device manufacturing method
Cast groove electric motor/generator cooling mechanism
Semiconductor memory device containing antifuse write voltage generation circuit
Folded cavity of optoelectronic devices
Method of balancing an embedded permanent magnet motor rotor
Randomly Featured Patents
Retractable safety syringe
Hose thread protector and splash guard
Catalyst compositions and their use for the preparation of methacrolein
Process of forming a bipolar type semiconductor device
System for securing messages recorded in an IP telephony network
Electronic fuel supply control system for internal combustion engines, having exhaust gas recirculation control
Battery-operated torch
Miniature electrical connector
Water-cooled AC and DC motor-generator set on a common shaft with series cooling flow path
Apparatus for directing fluids through a filter system
© 2006. PatentGenius. All Rights Reserved.
