Blinded code sheet format and method for its use

A three-paneled code sheet construction form useful to control blinded clinical trials of drugs and chemicals, which comprises (A) a first panel for test messages of generally single ply configuration having a number of substantially spaced writing areas on one writing mode side thereof, with room in the spaced writing areas sufficient for writing code designations and an appropriate test message

• said panel (A) having one or more lines of adhesive bonded to said writing mode side of said first panel (A),
• said adhesive being covered by removable strips of an adhesive protective liner to prevent the adhesive from sticking until ready for closing of said code sheet construction form,
• the other side of said first panel (A) being covered with a security format;
• (B) a removable, second panel of generally single ply construction removably connected to said panel (A) at one edge thereof, and
• said panel (B) having spaces of writing transference substance printed or otherwise adhering to the side of said second panel which places the writing transference substance in a position to transfer said code designation writing therethrough from panel (A) to a third panel (C), without transferring any said message to said third panel (C) in a writing mode when writing is made on panel (A);
• and
• (C) said third panel of generally single ply configuration hingedly interconnected with said first panel (A) along a second edge thereof;
• said third panel (C) having a number of spaced perforated perimeter areas thereon,
• said perforated perimeter areas approximating the size, shape, and area of the spaced writing areas on said panel (A), and
• which perforated perimeter areas are spaced on said third panel (C) to line up essentially coextensively in essential registered relationship with the spaced writing areas on said first panel (A), when said panels (A), (B) and (C) are folded together for said writing mode;
• said panels (A), (B) and (C) being arranged so that when said code designations and tests messages are written on said first panel (A) said code designation writings will be impressed through said first panel (A) and said second panel (B) to the corresponding perforated perimeter areas of said third panel (C) but the test message will not be transferred to said panel (C), and
• means to fold panels (A) and (C) approximately 360 degrees after the writing mode is completed to an in-line, closed, sealed relationship to each other, so that the spaced writing areas of panel (A) will be essentially covered and be in an essentially in-line relationship with the the perforated perimeter areas of panel (C), and
• means to seal the outer edges of said folded, closed, in-line panels (A) and (C) into essentially a folded construction, having the written-on writing areas of panel (A) in-line with and being covered by perforated perimeter areas of panel (C).