An active transponder device comprises a CMOS integrated circuit including means for receiving an input signal including coded information, a memory for storing said information, and transmitter means for transmitting an output signal including said information, the input signal and the output signal being both low frequency induction communication signals. Normally, the output signal is emitted in response to an interrogation signal received via the receiving means, and is formed by modulation ...

A scrambler/encryption system for randomizing an information-containing data signal for transmission and for reproducing at the receiver the information-containing data signal. The information-containing data to be transmitted is applied to a modulo-two adder, the output of which is the encoded data for transmission and which is also an input of an n stage shift register. An arbitrary logic network, having a plurality of inputs each connected to a plurality of selected shift register stages, pro...

For use in an alarm system, a security switch is provided, the transition state of which is detected by an associated circuit and a coded signal transmitted along a communication path indicative of the transition state, this coded signal being received and decoded to provide an output indication of the switch state.

A laundry ticket is provided that has separable tag portions with adhesive strips on opposite ends on one side thereof. The tags are threaded through a button hole and the two adhesive portions brought together to attach the tag to a garment without the use of staples. The tags bear bar coded identification data for associating an item of laundry with a laundry ticket.

A coded cassette for magnetic tape, film and the like, has a clutch mechanism which prevents transport of the record medium unless a complementally-coded key, as a part of the drive mechanism, is engaged therewith for operating the clutch to an unlocked condition.

Polymeric materials, for example, vinyl materials contain an added trace amount of a compound which is detectable by an instrumental method of analysis in the absence of the step of freshly exposing a surface of the sample and without substantial interference from other ingredients in the vinyl material. The incorporation of the added trace compound allows for coding of the material and provides a means to later identify the manufacturer of the film without the need to affix more visible identif...

A telephone security device is placed in the telephone line between the primary transmission network and receiver. Incoming telephone calls are automatically answered and monitored for a predetermined time. When a proper code is supplied by the calling party during the monitored time interval, an audio alert is sounded so the called party may pick up the phone and responsd in a normal manner. If the phone is not picked up during the time interval, the call is terminated.

A pulse-compression, MTI, doppler-radar system for determining target velty information from a single, frequency-coded uncompressed target-return pulse includes a coded modulator, two pulse compressors, and a phase-comparison processor. The coded modulator generates for transmission an uncompressed pulse with the first and second halves of the pulse coded with the even and odd harmonic sidebands of a pulse repetition frequency, respectively. The first and second halves of the pulse returning fro...

A pulse-compression, MTI, doppler-radar system for determining target velty information from a single target-return pulse is improved by the addition of a pulse-compression filter consisting of at least two pulse compressors and by the addition of a phase-comparison processor. The pulse compressors simultaneously pulse-compress separate portions of the single target-return pulse. The phase-comparison processor then determines the phase difference between the compressed pulses to obtain the targe...

A health-care glove constituted of thin elastic rubber-like material and having a thumb member at one side edge and a pinkie member at the opposite side edge. The glove has visual indicia for indicating to the user, the location of the thumb member so as to enable him to initially pick up the glove and easily apply it onto his hand, with the thumb member and pinkie member in the proper relative positions.