Variable data printing for security purposes using ceramic sub-micron infrared-luminescent particles in inkjet ink
AssigneeStardust Materials, LLC
InventorsVitaly Talyansky, Edward Talyanaksy, Jose Gasque
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Abstract
Methods and apparatus for variable data printing for security purposes using ceramic sub-micron infrared-luminescent particles in inkjet ink. An example apparatus includes an inkjet printer containing marked ink, the marked ink containing particles consisting of rare earth doped ceramics, wherein the particles are less than one micron in size, the particles are suspended in the marked ink, and the particles have luminescent properties such that when the particles are illuminated by first electromagnetic radiation having a first wavelength, the particles emit infrared light having a peak wavelength at a second wavelength.
Claims19
An apparatus comprising:
- an inkjet printer containing marked ink, the marked ink containing inorganic particles consisting of rare earth doped ceramics, wherein the particles are less than one micron in size, the particles are suspended in the marked ink, and the particles have luminescent properties such that when the particles are illuminated by first electromagnetic radiation having a first wavelength, the particles emit infrared light having a peak wavelength at a second wavelength.
A method comprising:
- milling ceramic powder into a solvent to produce inorganic ceramic particles with a size of less than one micron, wherein the ceramic powder consists of rare earth doped ceramics and wherein the ceramic particles have luminescent properties such that when the ceramic particles are illuminated with first electromagnetic radiation having a first wavelength, the ceramic powder emits infrared light having a second wavelength.
An apparatus comprising:
- A laser printer containing marked toner, the marked toner containing inorganic particles consisting of rare earth doped ceramics, wherein the particles are less than one micron in size, the particles are suspended in the marked toner, and the particles have luminescent properties such that when the particles are illuminated by first electromagnetic radiation having a first wavelength, the particles emit infrared light having a peak wavelength at a second wavelength.
Dependencies are inferred from the claim text.