Using thermally transferred invisible ink detectable by exposure

Details Using thermally transferred invisible ink detectable by exposure Using thermally transferred invisible ink detectable by exposure

1991-02-26

1993-05-18

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346 76PH, 283 91, 380 18, 380 54, H04N 123, H04N 144, G09C 500, B41J 2325

Patent

active

052125580

ABSTRACT:
In a facsimile machine which receives transmit data based on an original that is transmitted from a facsimile transmit machine through a telephone line at its data scrambler and which records an image of the original that is transmitted by decoding the received transmit data on recording paper at its thermal transfer printer portion, in order to maintain the secrecy of the original until the recording paper is delivered to an intended receiver by making it impossible to read the recording paper itself on which the transmit data is recorded and outputted, an image by invisible ink is recorded on the recording paper. Also, the image by the invisible ink which is recorded on the recording paper is displayed by converting it to a visible image by means of a visual observation apparatus, so that only a predetermined person can read the recording paper.

REFERENCES:
patent: 4504084 (1985-03-01), Jauch
patent: 4914700 (1990-04-01), Alasia

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