Pre-printed latent image spirit duplicating masters

Details Pre-printed latent image spirit duplicating masters Pre-printed latent image spirit duplicating masters

1975-12-10

1976-09-07

Kendall, Ralph S.

Stock material or miscellaneous articles

Composite

Of wax or waxy material

101DIG1, 101472, 101473, 106 21, 106 31, 35 9G, 427144, B41M 504

Patent

active

039795500

ABSTRACT:
A pre-printed spirit duplicating master containing visible imaged material and latent imaged material for use in preparing copies for self-instructional examination or work assignments. The latent images on the copy sheet are capable of being revealed with a pen containing a chemical developer and this can be done by the student in self-examination. The use of the pre-printed masters frees the teacher from the chore of preparing exams, or work assignments, making the masters, and from grading the papers.

REFERENCES:
patent: 2748024 (1956-05-01), Klimkowski et al.
patent: 3451143 (1969-06-01), Thomas et al.
patent: 3682673 (1972-08-01), Manske
patent: 3784394 (1974-01-01), Bildusas et al.
patent: 3931443 (1976-01-01), Neale

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