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Security module

  • US 5,615,622 A
  • Filed: 12/27/1994
  • Issued: 04/01/1997
  • Est. Priority Date: 11/25/1992
  • Status: Expired due to Fees
First Claim
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1. A security module through which personnel must pass when traveling between zones at opposite ends of said module, comprising a housing having a plurality of spaced apart interior facing side walls extending intermediate an entry end adjacent one of said zones and a exit end adjacent the other of said zones, personnel sensing means mounted within said walls for generating signals in response to the presence and absence of personnel within said module, said sensing means comprising infrared signal transmitters in one of said walls for directing infrared energy toward the other of said walls, and cooperating infrared signal receivers in the other of said walls for receiving said energy unless precluded by the presence of a person in the module, means defining grooves within said walls for receiving said sensing means and said walls comprising a composite structure having interior facing wall surfaces including opaque sheet material over said wall surfaces and covering said grooves for concealing said transmitters and receivers respectively but permitting said energy to pass therethrough.

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