Patents Assigned to Petrel
  • Security markings, material provided with security marks, and apparatus to detect the security mark
    Patent number: 5118349
    Abstract: The invention concerns a security-marking procedure, an apparatus to sense a security marking, fiduciary documents provided with security markings, by resorting to rare-earth chelates consisting of at least two rare-earths and of which the fluorescence wavelengths vary as functions of temperature, and fiduciary document containing such chelate(s).
    Type: Grant
    Filed: February 9, 1990
    Date of Patent: June 2, 1992
    Assignee: Petrel
    Inventor: Michel Jalon
  • Security markings, material provided with security marks, and apparatus to detect the security mark
    Patent number: 4921534
    Abstract: The invention concerns a security-marking procedure, an apparatus to sense a security marking, fiduciary documents provided with security markings, by resorting to rare-earth chelates consisting of at least two rare-earths and of which the fluorescence wavelengths vary as functions of temperature, and fiduciary document containing such chelate(s).
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: May 1, 1990
    Assignee: Petrel
    Inventor: Michel Jalon
  • Security markings, material provided with security marks, and apparatus to detect the security mark
    Patent number: 4891505
    Abstract: The invention concerns a security-marking procedure, an apparatus to sense a security marking, fiduciary documents provided with security markings, by resorting to rare-earth chelates consisting of at least two rare-earths and of which the fluorescence wavelengths vary as functions of temperature, and fiduciary document containing such chelate(s).
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: January 2, 1990
    Assignee: Petrel
    Inventor: Michel Jalon
  • Security markings, material provided with security marks, and apparatus to detect the security mark
    Patent number: 4833311
    Abstract: The invention concerns a security-marking procedure, an apparatus to sense a security marking, fiduciary documents provided with security markings, by resorting to rare-earth chelates consisting of at least two rare-earths and of which the fluorescence wavelengths vary as functions of temperature, and fiduciary document containing such chelate(s).
    Type: Grant
    Filed: July 16, 1987
    Date of Patent: May 23, 1989
    Assignee: Petrel
    Inventor: Michel Jalon