Printed matter – Method – Identifying
Patent
1987-12-15
1989-05-16
Yost, Frank T.
Printed matter
Method
Identifying
283903, 273139, 434346, B42D 1500, B42F 500, A63F 118, G09B 300
Patent
active
048304050
ABSTRACT:
The method consists of nullifying on a ticket a predetermined number of squares in a first series of squares by the removal of an opaque layer coated thereon and carrying the data to be validated by uncovering, under each square, a respective symbol, and of nullifying all the squares in a second series of squares by the removal of an opaque layer coated thereon and carrying said symbols, except for those squares which carry identical symbols of those uncovered in the first series of squares. If the squares uncovered from the first series identify a date, the presence on a ticket of covered squares in the second series carrying the same symbols as appear in the uncovered squares from the first series certifies that the squares in the second series have been uncovered after uncovering the squares in the first series, thus validating the identified date.
REFERENCES:
patent: 4095824 (1978-06-01), Bachman
patent: 4174857 (1979-11-01), Koza
patent: 4299634 (1981-11-01), Oberdeck et al.
patent: 4576399 (1986-03-01), White et al.
patent: 4591190 (1986-05-01), Clark
patent: 4603884 (1986-08-01), Burton
patent: 4669729 (1987-06-01), Solitt et al.
patent: 4725079 (1988-02-01), Koza et al.
Chetjack Limited
Heyrana Sr. Paul M.
Yost Frank T.
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