Abstract: Embodiments of luminescent materials and articles include first and second particles of first and second inorganic host lattices. The first particles are capable of producing first emissions having one or more first emission peaks at one or more first wavelengths. The first emissions have a first decay half-life that is long enough for the first emissions to be perceptible to the human eye for a first time period that begins when appropriate excitation of the luminescent material is discontinued. The second particles are capable of producing second emissions having one or more second emission peaks at one or more second wavelengths. The second emissions have a second decay half-life that is longer than the first decay half-life by a decay time difference that is sufficient for the second emissions to be perceptible to the human eye for a second time period that begins after the first time period.

Abstract: A method and system for identifying, tracking, and/or authenticating objects that is simple to apply and to use by an intended user, but is extremely difficult to counterfeit or compromise by an unintended user. Also disclosed is a multi-color, co-planar indicium made of a combination of printed patterns of multiple inks. The printed patterns may be modified by software-generated masks to ensure that the patterns are co-planar. The indicium is undecipherable unless irradiated with specified wavelengths of light radiation, filtered through specified spectral filters, and read and decoded by an electronic image reader. The indicium may be visible or covert. The indicium encodes unique true information about the object and may encode nonsensical or intentionally incorrect information as a further deterrent to unauthorized use. The method permits the indicia to be applied to objects at high processing speeds possible with inkjet printing.

Abstract: A method and system for identifying, tracking, and/or authenticating objects that is simple to apply and to use by an intended user, but is extremely difficult to counterfeit or compromise by an unintended user. Also disclosed is a multi-color, co-planar indicium made of a combination of printed patterns of multiple inks. The printed patterns may be modified by software-generated masks to ensure that the patterns are co-planar. The indicium is undecipherable unless irradiated with specified wavelengths of light radiation, filtered through specified spectral filters, and read and decoded by an electronic image reader. The indicium may be visible or covert. The indicium encodes unique true information about the object and may encode nonsensical or intentionally incorrect information as a further deterrent to unauthorized use. The method permits the indicia to be applied to objects at high processing speeds possible with inkjet printing.

Abstract: Systems for preparation of a mark and authentication of a mark vis-a-vis a counterfeit mark. Emission spectra comprising intensity versus wavelength distributions are collected from a series of taggants. One or more taggants is selected from the collected emission data such that the spectra of the selected taggants are distinguishable. The selection is also based on a consideration of the emitted radiation of a substrate and a dispersive medium. The authentication system uses multivariate statistical analysis to calculate at least one measurement statistic of a mark to be authenticated and at least one statistical limit based on a series of training marks prepared by the preparation system. Authenticity of the mark is determined based on a comparison of the measurement statistic and the statistical limit.

Abstract: Systems for preparation of a mark and authentication of a mark vis-a-vis a counterfeit mark. Emission spectra comprising intensity versus wavelength distributions are collected from a series of taggants. One or more taggants is selected from the collected emission data such that the spectra of the selected taggants are distinguishable. The selection is also based on a consideration of the emitted radiation of a substrate and a dispersive medium. The authentication system uses multivariate statistical analysis to calculate at least one measurement statistic of a mark to be authenticated and at least one statistical limit based on a series of training marks prepared by the preparation system. Authenticity of the mark is determined based on a comparison of the measurement statistic and the statistical limit.

Abstract: A method and system for identifying, tracking, and/or authenticating objects that is simple to apply and to use by an intended user, but is extremely difficult to counterfeit or compromise by an unintended user. Also disclosed is a multi-color, co-planar indicium made of a combination of printed patterns of multiple inks. The printed patterns may be modified by software-generated masks to ensure that the patterns are co-planar. The indicium is undecipherable unless irradiated with specified wavelengths of light radiation, filtered through specified spectral filters, and read and decoded by an electronic image reader. The indicium may be visible or covert. The indicium encodes unique true information about the object and may encode nonsensical or intentionally incorrect information as a further deterrent to unauthorized use. The method permits the indicia to be applied to objects at high processing speeds possible with inkjet printing.

Abstract: A predetermined pattern of a dielectric polymer is formed on a substrate from a mixture of prepolymers which are the ethers of the oligomeric condensation product of (a) dihydric phenol and formaldehyde and (b) a dialdehyde and 3 to 4 moles of a phenol.

Abstract: A predetermined pattern of a dielectric polymer is formed on a substrate from a prepolymer which is an ether of the oligomeric condensation product of a dihydric phenol and formaldehyde having the formula ##STR1##

Abstract: A predetermined pattern of a dielectric polymer is formed on a substrate from a mixture of prepolymers which are ethers of the reaction products of (a) a dicyclopentadiene and a phenol and (b) a dialdehyde and 3 to 4 moles of a phenol.

Abstract: A predetermined pattern of a dielectric polymer is formed on a substrate from a prepolymer which is an ether of the reaction product of a dicyclopentadiene and a phenol.

Abstract: This method relates to a process for manufacturing printed circuit boards in which a metal coating is sputtered onto certain regions of a substrate. Adhesion of the sputtered material is excellent. Surface preparation of the substrate and etching thereof prior to sputtering are virtually eliminated. Films deposited by sputtering exhibit uniform coverage and thickness.

Abstract: This method relates to a process for manufacturing printed circuit boards having high density, fine lines of printed conductors. Extremely straight, vertical walls are formed in the radiation light curable dielectric material.

Abstract: This invention relates to a process for conditioning the surfaces of natural and synthetic plastic materials for electroless plating of a metal coating thereon exposing such materials to an atmosphere comprising ozone, contacting said exposed materials with a conditioning solvent, such as an aqueous solution of sodium, potassium or lithium hydroxide, contacting said materials with one or more oxidizing acids such as nitric acid and electroless plating of a metal coating on the said material.