Data card
First Claim
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1. A data card wherein data are recorded with a powdery infrared-infrared fluorescent material, said infrared-infrared fluorescent material being at least one member selected from the group consisting of a fluorescent material containing neodymium;
- a fluorescent material containing neodymium and ytterbium;
a fluorescent material containing ytterbium and erbium; and
a fluorescent material containing neodymium, ytterbium and erbium.
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Abstract
A data card wherein various data are recorded with a fluorescent material which emits infrared rays when excited by infrared rays is disclosed.
The data card according to this invention has such merit that it is very effective for the preservation of secrecy and the prevention of forgery, that it is not affected by stains, that different information can be recorded thereon one over the other, and that it can be read by an extraordinarily compact reader.
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Citations
17 Claims
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1. A data card wherein data are recorded with a powdery infrared-infrared fluorescent material, said infrared-infrared fluorescent material being at least one member selected from the group consisting of a fluorescent material containing neodymium;
- a fluorescent material containing neodymium and ytterbium;
a fluorescent material containing ytterbium and erbium; and
a fluorescent material containing neodymium, ytterbium and erbium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- a fluorescent material containing neodymium and ytterbium;
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15. A data card wherein data are recorded with an infrared-infrared fluorescent material, said material consisting of at least one member selected from the group consisting of a fluorescent material containing neodymium and ytterbium, a fluorescent material containing ytterbium and erbium, and a fluorescent material containing neodymium, ytterbium and erbium.
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16. A method of recording information on a data card and of determining the information recorded on the data card which comprises recording data in a thin layer of a powdery infrared-infrared fluorescent material having appropriate configuration on a surface of said data card;
- irradiating the side of the data card containing the infrared-infrared fluorescent material with infrared rays of one wavelength thereby causing said infrared-infrared fluorescent material to emit infrared rays of another wavelength, introducing the emitted infrared rays to a means for producing a signal indicative of said data and introducing the signal into a means for converting the signal into a display corresponding to the data recorded on said data card.
- View Dependent Claims (17)
Specification