Patents Assigned to Infrastructure Instruments Inc.
  • Dual-axis force feedback accelerometer
    Patent number: 5789677
    Abstract: A force-feedback accelerometer to measure small accelerations along two or more co-planar axes. A fiber suspension of a proof mass provides mechanical sensitivity; a cylindrical cross-section on the proof mass, with orthogonal optical position sensing, reduces sensitivity to torsional accelerations. Coupling both proof mass position and proof mass velocity to the feedback force eliminates the disadavantages associated with other forms of damping.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: August 4, 1998
    Assignee: Infrastructure Instruments Inc.
    Inventor: Alexander McEachern
  • Electric power measuring instrument with speech synthesis feature
    Patent number: 5530738
    Abstract: An electronic measuring instrument measures and records power disturbances and other power parameters on an alternating current system. The instrument incorporates a speech synthesis subsystem, coupled to a telephone system, which is capable of providing a spoken report describing power disturbances and other power parameters. The telephone coupling system incorporates a structure for sharing a telephone extension in a non-disruptive way.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: June 25, 1996
    Assignee: Infrastructure Instruments Inc.
    Inventor: Alexander McEachern
  • Instrument for detecting hidden structural damage in multi-story buildings
    Patent number: 5526694
    Abstract: An electronic measuring instrument measures and records the acceleration frequency spectra of a multi-story building while it is excited by wind. Such frequency spectra are indicative, in part, of building structural stiffness. When a tramatic structural event occurs, such as an earthquake, an explosion, or a hurricane, changes in wind-excited frequency spectra are used to detect hidden structural damage to the building.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: June 18, 1996
    Assignee: Infrastructure Instruments Inc.
    Inventors: Alexander McEachern, Joseph Ungerer