Phosphorescent directional signals and manufacturing method
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United States of America Patent
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Feb 3, 1998
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N/A
app pub date -
Jul 15, 1996
filing date -
Nov 2, 1989
priority date (Note) -
Expired
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Abstract
Claimed are a method of making a direction indicating carpet, useful in temporarily unlighted building hallways and rooms. Symbols are tufted into the carpet using zinc sulfide copper activated pigments in concentration of 2% in the fiber.
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