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
Microbial fuel cell and method of use
Emergency power-off button with proximity alarm
Selected alert delivery in a distributed processing system
Vehicle drive control system
Systems and methods for vehicle cruise control
Generation of uniform fragments of nucleic acids using patterned substrates
Engineered magnetic layer with improved perpendicular anisotropy using glassing agents for spintronic applications
  Randomly Featured Patents
Noise reduction in coherent systems
Foldable rocking chair
Polarization feedback laser stabilization
Titanium and cerium containing acidic electrolyte
Stapling apparatus for stapling folded sheet products
Multiple-processor information processing system
Electro-optic signal conversion
Tailgate ramp and load locking accessories for a pickup truck
Scaling charge delivery in discontinuous mode switching regulation
In-line roller skate frame