Resources Contact Us Home
Browse by Category: Main > Communications
Class Information
Number: 181/247.gtoreq.251
Name: Acoustics >

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
Bipolar transistor with diffused layer between deep trench sidewall and collector diffused layer
Method of manufacturing touch panel
Maize variety hybrid X13A495
System for presenting media services
Fuser member
Drugs for prophylaxis or mitigation of taxane-induced neurotoxicity
Image processing system and method
  Randomly Featured Patents
Rigid tipped riblets
Encapsulation machine with valved injection wedge
Thin film resonators fabricated on membranes created by front side releasing
Auto-lock slide fastener slider
Device and method for ultrasonic inspection using profilometry data
System for management of cutting machines
System and method for creating and maintaining a CD ROM client in a computer network
Semiconductor light-emitting element
Clip for a wig
Snowmaking process