Printed matter – Having revealable concealed information – fraud preventer or...
Patent
1987-11-18
1989-10-03
Yost, Frank T.
Printed matter
Having revealable concealed information, fraud preventer or...
283 70, 282 28R, 428 40, B42D 1100, B42D 1500, B41L 116, D21H 102
Patent
active
048711934
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for irreversible recording, using two sheets joined one above the other, and at least one intermediate sheet which provides the contrast for recording, the record being written on one and/or the other of the two sheets and the intermediate sheet producing an image of the record on at least one of, the mutually facing sheets, preferably on at least one of the sides of the sheets facing each other. Further, the present invention relates to a recording carrier with a first sheet and a second sheet, joined one above the other as well as with at least one interposed intermediate sheet producing the contrast for recording. In addition, the present invention relates to utilization of the process or of the recording carrier for recording carriers wherein it is to be made impossible to alter a recording once it has been made, such as for documentary forms, study sheets, credit forms, credit cards, etc.
Swiss patent No. CH 611,061 discloses questionnaires with two sheets joined together along three marginal edges. An interleaf, carbon paper, is provided therebetween which can be pulled out in the fourth edge region of the joined sheets In case of such question papers, the correct solution to a posed problem is printed on one of the sides of the sheets mutually facing each other at the intermediate sheet, and this cannot be recognized from the outside when the intermediate sheet has been inserted. A student solves the posed problem on a solution area specifically provided for this purpose, the student's record being copied onto the side of the sheet imprinted with the correct solution as mentioned above. Thereafter, the student removes the intermediate sheet whereby, on the one hand, the correct solution becomes visible through one of the sheets designed to be transparent, but, on the other hand, corrrection of the solution already entered by the student is made impossible, as follows:
Reinsertion of the intermediate sheet providing the contrast for the recording, in this case carbon paper, is precluded by the feature that the latter is folded, at the pull-out opening, about the edge of one of the sheets and is retained in this position by a reverse fold. Thus, it can only be pulled out around the edge of one of these sheets. Reinsertion of the intermediate sheet beneath the reverse fold and around the edge of one of the sheets is impossible.
This reverse fold is relatively expensive in its manufacture. Additionally provisions must be made at the edge of one of the sheets around which the intermediate sheet is pulled out so as to prevent this edge from being torn out when the intermediate sheet is extracted. The provision of the reverse fold, together with a reinforcement of the aforementioned edge, result in an undesirable local thickening of the recording carrier, which is disadvantageous particularly when binding a plurality of such carriers into a book.
It is an object of the present invention to eliminate the aforementioned disadvantages caused by the mechanical reverse-feed barrier for the intermediate sheet.
To this end, the process described in the foregoing is distinguished by providing, by at least partial removal of the intermediate sheet, the establishment of a bond of mutually facing sheet sides which can be separated only with difficulty without destruction. Further, the recording carrier mentioned above is distinguished by first and second sheets joined together one above the other, at least one interposed intermediate sheet affecting the contrast for recording, wherein on at least one mutually facing sheet side on at least one of the sheets, an adhesive area is provided which does not substantially adhere to the intermediate sheet but does adhere to the sheet facing the adhesive area after removal of the intermediate sheet to make separation without destruction difficult.
The invention will be described in greater detail hereinbelow by way of example with reference to figures wherein:
FIG. 1a shows a schematic cross section through the structure of a recordin
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Heyrana Paul M.
Yost Frank T.
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