US 5,005,873 · Granted 1991-04-09
Marking of articles
An article comprising a substrate having markings which are provided by at least two fluorescent materials which have different excitation spectra in the ultraviolet region of the spectrum and different emission spectra in the visible region of the spectrum. The invention also provides a method of marking an article for identification.
Patent details
- Publication number
- US 5,005,873
- Filing date
- 1987-04-07
- Grant date
- 1991-04-09
- Assignee
- West Michael A
- Inventor(s)
- WEST; MICHAEL A.
- CPC class
- B42D25/378
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