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Class Information
Number: 380/53
Name: Cryptography > Electric signal modification > Including particular structure or housing (e.g., display, keyboard) > Audio transducer mounting or structure
Description: Subject matter including a structural detail or an audio sensing or reproducing transducer or a mounting therefor.

Patents under this class:

Patent Number Title Of Patent Date Issued
8467525 Steganographic method and device Jun. 18, 2013
8347102 Image processing apparatus and method for transmitting encrypted data Jan. 1, 2013
8131646 Reprogrammable security for controlling piracy and enabling interactive content using revocation status Mar. 6, 2012
7870393 Steganographic method and device Jan. 11, 2011
7436957 Audio cassette emulator with cryptographic media distribution control Oct. 14, 2008
6671813 Secure on-line PC postage metering system Dec. 30, 2003
6297892 Device for protecting data transmitted by a facsimile machine Oct. 2, 2001
6282611 Digital information system, digital audio signal processor and signal converter Aug. 28, 2001
5969283 Music organizer and entertainment center Oct. 19, 1999
5745579 Cellular telephone security adapter and method Apr. 28, 1998
5056137 Method and apparatus for encoding and decoding signals Oct. 8, 1991
4396802 Aswixs remote speaker and handset set Aug. 2, 1983
4268720 Scrambler speech transmission and synchronization system May. 19, 1981
4117271 Inductive communication system Sep. 26, 1978

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