Cryptography – Miscellaneous
Patent
1986-05-02
1987-10-27
Lowe, James
Cryptography
Miscellaneous
264 27, 264162, 264230, 264234, 264293, 264345, 283901, 283904, 428916, 434328, 434346, 283 72, G09C 500, B42D 1500, B29C 5902, B29C 6100
Patent
active
047024976
ABSTRACT:
The method includes the steps of inscribing or imprinting a symbol or message on a substantially flat surface of a block of plastic while the same is at an elevated temperature by the application of pressure to said surface. The plastic block is then cooled to approximately room temperature and all visible evidence of the inscription is "erased" by physically removing, as by grinding, the superficial layer of material which bears the visible inscription. The inscription is made to reappear on the surface of the remaining block of plastic by heating the same to approximately the elevated temperature at which the inscription was made until the symbol or message reappears.
REFERENCES:
patent: 730823 (1903-06-01), Hall
patent: 2516727 (1950-07-01), Schultheiss
patent: 2529151 (1950-11-01), Glass et al.
patent: 2580305 (1951-12-01), Kremer
patent: 3508344 (1970-04-01), Thomas
patent: 3758649 (1973-09-01), Frattarola
patent: 4076772 (1978-02-01), Murbach et al.
patent: 4409277 (1983-10-01), Michel
patent: 4597814 (1986-07-01), Colgate, Jr.
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