Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Communications
Class Information
Number: 181/69
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
Chitosan hydrogel derivatives as a coating agent with broad spectrum of antimicrobial activities
Polyester resin for toner, electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming met
Battery loading and unloading mechanism
Method and apparatus for supporting HARQ
Codeword-enhanced peer-to-peer authentication
Modular authoring and visualization of rules using trees
Domestic soda-water preparing device
  Randomly Featured Patents
Organic light emitting display device provided with an organic layer including an amorphous molybdenum oxide layer and a crystal molybdenum oxide layer
Wall wash light fixture for tracking lighting system
X-ray image diagnostic apparatus
Method of and apparatus for electrolytic treatment of metal
Power supply apparatus for suppressing attenuation of a transmission signal
Cap
Original keep device in copying machine
Method for making a through opening in a high-pressure fuel reservoir, and apparatus for performing the method
Aspects of compton scattered X-ray visualization, imaging, or information providing
Automatic paper loader for a printer