Resources Contact Us Home
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
Magnetic storage apparatus
Semiconductor device, integrated circuit and method of manufacturing an integrated circuit
Method and apparatus for content-aware resizing of data chunks for replication
Image-monitoring method for electroporation treatment and as associated image-monitoring appliance
3D structured memory devices and methods for manufacturing thereof
Peer to peer (P2P) missing fields and field valuation feedback
Buried object detection in GPR images
  Randomly Featured Patents
Spool valve with offset outlet
Self contained solar heating supplemental unit
Laser power control of an optical head with a plurality of beam sources
Universal connector assembly and method of manufacturing
Air-moving appliance for drying or styling hair
Method for manufacturing a joint pipe
Cooling system for a motor-vehicle internal combustion engine
Microcontroller with programmable logic on a single chip
Apparatus for adjusting a tilt of a disc loaded on a turn table