Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Communications
Class Information
Number: 181/247.gtoreq.251
Name: Acoustics >
Description:










Sub-classes under this class:

Class Number Class Name Patents
181/ Speaking tubes 0
181/.5 Miscellaneous 98
181/101 Geophysical or subsurface exploration 51
181/123 Echo system 10
181/125 Sound location 17
181/126 Anatomic or prosthetic relation 27
181/138 Mechanical telephone 6
181/139 Wave generation and detection 30
181/140 With vessel 16
181/141 Combined 150
181/142 Wave generation 62
181/143 Moving sound producer or deflector 13
181/144 Plural diaphragm sound sources 254
181/148 Diaphragm and enclosure 256
181/157 Diaphragm 75
181/175 Sound-modifying means 160
181/30 Auditorium 74
181/400 Wave coupling 19
181/403 Refrigerator compresssor muffler 195
181/404 Hobby craft engine muffler 5


Patents under this class:

Patent Number Title Of Patent Date Issued











 
 
  Recently Added Patents
Authenticating and off-loading IPTV operations from mobile devices to fixed rendering viewing devices
Nitrogen and hindered phenol containing dual functional macromolecular antioxidants: synthesis, performances and applications
Photographic printing paper and method of making same
Methods, systems, and computer program product for virtually modifying surface region curvature to detect protrusions
System and method for document orientation detection
Method and apparatus for blind signal extraction
Method for making an abrasion-resistant steel plate and plate obtained
  Randomly Featured Patents
Pre-start engine lubrication system
Thin film magnetic head with coil windings receiving trench
Stand for optical devices, particularly cameras
Apparatus and method for transmitting an image signal modulated with a spreading code
Non-electric delay detonator
Shrimp and tray combination and method of making same
Electromagnetic bandgap structure and printed circuit board
Gasoline additive concentrate composition and fuel composition and method thereof
Method and system to automatically generate classes for an object to relational mapping system
Hearing aid, and a method and a signal processor for processing a hearing aid input signal