Registers – Coded record sensors – Particular sensor structure
Patent
1998-01-05
2000-10-31
Lee, Michael G
Registers
Coded record sensors
Particular sensor structure
235491, G06K 710
Patent
active
061389137
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The present invention relates to placing a marking on a substrate or other object which is invisible to the unaided human eye but can be detected using an apparatus producing light in the visible and near infrared spectra. The invention further relates to a method of encoding information on a substrate using a near infrared fluorescing compound and detecting the compound.
Prevention of fraud, copying, or theft of goods such as automobiles, boats, motorcycles, bicycles, art, collectibles, and important documents such as financial instruments (stocks, bonds, security papers, checks and bank notes), and government issued papers (passports, drivers licenses and identity cards) has been a long-standing problem in society. The prior art is replete with many approaches to deter or avoid such fraud, copying or theft by placing visible and/or invisible identification marks on the goods and documents. Such identification marks have been placed openly or in covert locations. For example, U.S. Pat. No. 4,239,261 issued to Richardson on Dec. 16, 1980 discloses a micro-marking label applied to an article. The marker or label is formed from a thin plate of generally clear plastic material which is typically transparent or may be tinted with a specific color if required. The thickness of the material is about 0.001 of an inch to 0.002 of an inch (1 to 2 mills) with an overall dimension ranging from about 0.0286 by 0.0286 of an inch. The exact dimensions of the marker or label can be varied to fill space requirements or to eliminate optical resolution or optical definition limitations of photo reproduction equipment. The area of the marker is divided into segregated digital areas into which homogeneous or digital markings are placed in order to designate a specific code to identify the object. A disadvantage of this marker is that it resides on the surface of the substrate. The label can be covered up, knocked off or obliterated in which case the marker or label looses its effectiveness.
U.S. Pat. No. 5,083,814 issued to Guinta et al. on Jan. 28, 1992 discloses a security method for applying a security marking to an automobile, boat and the like. The method involves a nationwide network of authorized dealers which are supplied with input and output devices such as computer, monitor and a hand-held marking device. Using specified locations data supplied from a central process unit, the dealer applies to the surface of the automobile a confidential and invisible registration code.
In many printing technology applications it is necessary to distinguish an original from a copy or counterfeit item. With modem copying techniques, printed material can be reproduced at will and is virtually indistinguishable from the original, especially if the copy is printed on a substrate that is similar to the original. It is well known that various means and methods have been proposed for covertly marking and identifying items to circumvent and economically dissuade someone from copying the original. Typically, such means and methods used inks or paints that fluoresce when subjected to an ultraviolet light source. Such simple fluorescent marking used in conjunction with ultraviolet light provides a dramatic effect, since the marking, which is seemingly invisible to light in the visible spectra of 400 to 700 nanometers becomes brightly fluorescent under ultraviolet radiation. For example, U.S. Pat. No. 4,736,425 issued to Jalon on Apr. 5, 1988 discloses a two-step marking method for important documents, such as security papers, bank bills, checks, shares, stamps and the like to prevent forgery and to authenticate the document. In the first step of the marking process, one or more elements which form a chelate are deposited in or on the security paper. The elements are chosen so that the chelate is not formed until later. In the second step of the process, the chelate is formed by depositing on the paper the missing components to produce the synthesis of the chelate. The missing elements are added to the paper by means of an aqueous
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Clauberg Horst
Cyr Michael John
Helton Tony Wayne
Krutak, Sr. James John
Casperson John R
Davis Mark L.
Isotag Technology, Inc.
Lee Michael G
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