Measuring and/or security system
April 26, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3755744 3766518 Distance measuring equipment Optical smoke detector circuit Calibrated radio frequency analog spectrum analyzer Two-way ranging system Apparatus for determining the position of a movable object Memory package system utilizing inductive coupling between memory module and read/write unit Digital communicating method and apparatus Method and apparatus for forming intermittent chips when machining a rotating workpiece InventorAssigneeApplicationNo. 297154 filed on 04/26/1999US Classes:340/571, Alarm on protected article340/10.1, Interrogation response340/568.1, Article placement or removal (e.g., anti-theft)340/573.1, Human or animal340/573.4, House arrest system, wandering, or wrong place340/825.57, Pulse responsive actuation340/825.69Radio linkExaminersPrimary: Tong, NinaAttorney, Agent or FirmForeign Patent References
International ClassG08B 013/14Foreign Application Priority Data1996-11-01 DEAbstractMeasuring and/or control system (1) for detection of the distance of an object (2) or of a person from a predetermined reference point, with a first transmitting/receiving device (10) for generation and wireless transmission of a control signal to a separate second transmitting and/receiving device (30), as well as for receipt of an acknowledgment signal generated from the second transmitting/receiving device (30) upon receipt of the control signal, whereby both of the transmitting/receiving devices display on the transmitting side a signal source (23, 24, 25, 26) that generates as a control and/or as an acknowledgment signal, pulses that display during the duration of the pulse a monotonically falling or rising frequency, or that consists of a super-position of these types of pulses in pairs, the other current transmitting/receiving device (10, 30) displaying on the receiving side for time compression of the received pulses, at least one dispersion filter (11) having a predetermined frequency-dependent signal transit time, which is matchedadapted to the transmitting side modulation such that the spectral signal portions of the control and/or acknowledgment signal, because of the frequency-dependent different signal transit time through the dispersion filter (11), appears at its output essentially coincidentally and, therewith, with little temporal imprecision.Other References
Field of SearchAlarm on protected articleHuman or animal Domestic animal training, monitoring, or controlling House arrest system, wandering, or wrong place Incontinence or enuresis alarm Water safety alarm Article placement or removal (e.g., anti-theft) Interrogation response Pulse responsive actuation Counting Radio link | |
