Inkless fingerprint composition and applicator therefor
AssigneeArmor Holdings Forensics, Inc.
InventorDouglas C. Arndt
Life of this patent
Estimating the term…
Abstract
A nonstaining ink (or inkless) fingerprint composition and applicator comprises two nonpermeable foil strips, made of Mylar, for example, having the same width with one strip being slightly longer than the other. A thin layer or coating of an inkless (or nonstaining) fingerprint composition is sandwiched between the superimposed foil strips leaving a small border including a small area at the end of the strips free of the composition. The inkless composition which includes a color former and may or may not include a developer is in a semisolid state and room temperature and in a liquid state at about 110° F. and above.
Claims26
A method of manufacturing an inkless fingerprint composition and disposable applicator therefore comprising:
- a) providing a first and second substantially nonpermeable foil strips, the strips have substantially the same width with the first strip being slightly longer than the second strip to provide an extended pull-tab when the strips are superimposed on one another;
- b) providing an inkless fingerprint composition which is semisolid at ambient temperature, the composition including a color former which when applied to a person's fingerprint area and deposited onto a proper substrate in the presence of a developer forms a permanent colorant product representing the person's fingerprint;
- c) evenly distributing a thin layer of the composition on a surface of one of the strips while leaving a border around the perimeter of the strip without the composition;
- and
- d) placing the other strip over said one strip so that the composition is sandwiched between the strips with a peripheral border of both strips and the peel tab area being unencumbered with the composition.
An inless fingerprint composition and disposable applicator therefore comprising:
- a) first and second substantially nonpermeable foil strips, the strips have substantially the same width with the first strip being slightly longer than the second strip to provide an extended pull-tab when the strips are superimposed on one another;
- and
- b) a thin layer of an inkless fingerprint composition sandwiched between the superimposed strips leaving a small peripheral border and the pull-tab area free of the composition, the composition including a solution of a color former which is semisolid at ambient temperature, the color former being characterized by forming a perceivable colorant product representing a person's fingerprint when applied to the person's fingerprint area and deposited onto a paper substrate in the presence of a developer.
A method of manufacturing a nonstaining fingerprint composition and disposable applicator therefore comprising:
- a) providing a first and second substantially nonpermeable foil strips, the strips have substantially the same width with the first strip being slightly longer than the second strip to provide an extended pull-tab when the strips are superimposed on one another;
- b) providing a nonstaining fingerprint composition which comprises one or more alcohol soluble dyes in one or more fatty acid esters which have at one hydroxyl group available;
- c) evenly distributing a thin layer of the composition on a surface of the first strip while leaving a border around the perimeter of the strip without the composition;
- and
- d) placing the second strip over said first strip so that the composition is sandwiched between the strips with a peripheral border of both strips and the peel tab area being unencumbered with the composition.
Dependencies are inferred from the claim text.