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Infra-red laser device and method for searching for lost item

  • US 6,803,575 B2
  • Filed: 11/02/2001
  • Issued: 10/12/2004
  • Est. Priority Date: 01/21/1999
  • Status: Expired due to Fees
First Claim
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1. A monitoring device useful in seeking to retrieve a lost item, said lost item having a hologram attributable to surface components selectively responsive to a laser beam having an explicit wavelength selected from the atmospheric-penetrative identifying group consisting of 880 nm, 1310 nm and 1550 nm, said monitoring device comprising:

  • a source of electric power;

    means actuated by said electrical power for generating a laser beam having a wavelength matching the wavelength for which said components are selectively responsive;

    receptor cells responsive to the feedback light from said laser beam;

    amplifier means amplifying the electrical signal generated by said feedback when the laser beam scans a search zone possibly containing such temporarily lost item; and

    indicating means alerting a searcher to the varying intensity of such feedback when the laser beam scans a search zone possibly containing such temporarily lost item.

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