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Class Information
Number: 178/37
Name: Telegraphy > Systems > Printing > Recorders > Privacy (e.g., mechanical packaging or covering of printed message)
Description: Recorders for concealing or secreting the printed message from those not authorized to read it.

Patents under this class:

Patent Number Title Of Patent Date Issued
5031379 Message receiving arrangement Jul. 16, 1991
4809160 Privilege level checking instruction for implementing a secure hierarchical computer system Feb. 28, 1989
4701233 Method for folding and sealing sheets Oct. 20, 1987
4106060 Electronic mail box Aug. 8, 1978
3992571 Differential optical polarization detectors Nov. 16, 1976

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