Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Communications
Class Information
Number: 181/33HC
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
Account and customer creation in an on-line banking model
Display apparatus
Light emitting device
Method and apparatus for laser strip splicing
Shower bench
Information processing apparatus, information outputting method and computer program storage device
LCD driving circuit in which shift register units are driven by a first clock signal of fixed duty/amplitude and a second clock signal of variable duty/amplitude
  Randomly Featured Patents
Adjustable length prosthetic implant
Systems and methods for migrating a server from one physical platform to a different physical platform
Physical design automation system and process for designing integrated circuit chips using highly parallel sieve optimization with multiple "jiggles"
Microresonantor systems and methods of fabricating the same
Coupling device for glass fiber connectors
Laminated map directory
Over-center draw latch
Color separation/combination prism and image-projection apparatus
Canine biscuits containing an inorganic pyrophosphate
Document processing system providing job attribute control and override features and related methods