Fingerprint ink dispenser
AssigneeIdenticator Corporation
InventorsDouglas C. Arndt, Bruce H. Gindelberger
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Abstract
A fingerprint ink dispensing apparatus includes a ceramic disk positioned over an ink reservoir in the form, for example, of a felt pad. The ceramic disk has an average porosity of about 40% and an average pore size of about 5 microns. A colored pigment such as carbon black dispensed in a hydrocarbon oil is disposed in the reservoir with the concentration of the carbon black being about 22% by weight and the diameter of the carbon black particles falling within the range of 0.15 to 0.60 microns and the average size being about 0.35 microns.
Claims20
Fingerprint ink dispensing apparatus comprising:
- a housing having an open top, a closed bottom and an upstanding peripheral wall;
- reservoir means positioned on the bottom of the housing for receiving an ink to be dispensed;
- a ceramic plate positioned within the housing and in intimate contact with the reservoir means and the peripheral wall of the housing so that ink flowing from the reservoir means must travel through the ceramic plate, the ceramic plate having an average porosity within the range of about 40% to 45% and an average pore size of about 5 microns in diameter;
- and
- an ink disposed within the reservoir, the ink comprising a colored pigment dispersed in a hydrocarbon based oil, the pigment having an average particle diameter of about 0.35 microns with the diameter of substantially all of the pigment particles falling within the range of about 0.15 to 0.60 microns, the concentration of the pigment being of about 22% to 30% by weight.
The invention of claim 10 wherein the specific gravity of the ink is about 0.938.+-.0.005 at 25.degree. C.
Fingerprint ink dispensing apparatus comprising:
- a housing having an open top, a closed bottom and an upstanding peripheral wall;
- a ceramic plate positioned within the housing and in intimate contact with the peripheral wall of the housing, having an average porosity within the range of about 40% to 45% and an average pore size of about 5 microns in diameter;
- and
- an ink disposed within the ceramic plate, the ink comprising a colored pigment dispersed in a hydrocarbon based oil, the pigment having an average particle diameter of about 0.35 microns with the diameter of substantially all of the pigment particles falling within the range of about 0.15 to 0.60 microns, the concentration of the pigment being about 22% by weight.
Dependencies are inferred from the claim text.