Richard E Sharkey

48375845, Jun 6, 1989

Jan 4, 1988

7/140567

Richard B. Sharkey - New York NY
Robert T. Emerson - Manhasset NY

Leedall Products, Inc. - New York NY

G01D 900

346 11

System for requiring the contemporaneous application of time clock data and personal data to a time card to prevent or signal the fraudulent application of either type of data at a time which is substantially different from the other type of data, i. e. , by up to about 15 minutes. The present system includes the use of time cards having at least one color-forming chemical which may be in the form of a discontinuous coating, time clock transfer elements which may be coated with at least one complimentary color-forming chemical, pre-application of a liquid coating to the data-receiving area of the time card, which liquid coating permits the desired color-forming reaction only while it is liquid and which dries under ambient conditions before about 15 minutes, and the use of a signature-applying implement containing a special ink including at least one color-forming chemical and/or a mixture thereof with a transparent dye or pigment. The special ink forms multi-colored signatures when applied to the discontinuous time card coating, according to a preferred embodiment.