Title:
Method and apparatus of retrieval of coded information from symbols having coded inks having photoluminescent components with short and long time constants of decay after short wave illumination
United States Patent 3412245

Inventors:
Frederick, Halverson
Publication Date:
11/19/1968
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Assignee:
AMERICAN CYANAMID CO
Primary Class:
250/271
Other Classes:
235/468, 250/233, 235/491, 235/469
International Classes:
C09D5/22; G01N21/64; G06K7/12




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