US PATENT SUBCLASS 380 / 49
.~ With digital signal handling (e.g., digital control, digital computer communication)

Current as of: June, 1999
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380 /   HD   CRYPTOGRAPHY

9  DF  ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) {18}
49.~ With digital signal handling (e.g., digital control, digital computer communication) {1}
50  DF  .~.~> Including shift register or memory

DEFINITION

Classification: 380/49

With digital signal handling (e.g., digital control digital computer communication):

(under subclass 9) Subject matter in which an encrypting or decrypting device utilizes a digital signal manipulation technique on the information signal.

(1) Note. This subclass includes use of an encrypted signal to form a communication link between plural computing or data processing devices. Also included is encryption controlled by a pulse or digital signal.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications, appropriate subclasses for digital signal or processing absent encryption.

709, Electrical Computers and Digital Data Processing Systems: Multiple Computer or Process Coordinating,

200+, for data transferring among multiple computer and digital processing systems.

713, Electrical Computers and Digital Processing Systems: Support,

200+, for security in digital processing systems. 714, Error Detection/Correction and Fault Detection/Recovery, appropriate subclasses for generic error checking of digital devices.