A secure identification system for identifying a potential target in a battlefield environment as being either a friend or a foe is disclosed. An interrogator produces two interrogation pulses, such as laser flashes, aimed at the target and separated from each other by a randomly determined period of time. The target detects the two interrogation pulses, measures elapsed time between the two pulses, and prepares a reply signal for transmission which is controlled by the elapsed time. Frequency, ...

In a preferred embodiment (FIG. 6), an identification circuit comprises an input terminal (40), an output terminal (43), a combined counter and comparator circuit (39) with counter input terminals (38), an OR gate circuit (42) and a trigger circuit consisting of an inverter (44) and a multivibrator (41). The said components are connected so that rapid identification of an identification code represented by the signals on the counter input terminals (38) can be obtained with just a single input a...

A position indicating device (10) including a capsule (11) of lighter-than-air gas, a balloon envelope (13) and a connection and release assembly (12) securing the balloon envelope (13) to the capsule (11). The connection and release assembly (12) includes an actuator (29) which may be rotated to cause the capsule (11) to be pierced and permit gas to escape into the balloon envelope (13) and a release pin (46) to release the balloon envelope (13) when inflated. The height of elevation of the bal...

A remotely powered portable member having circuitry for storing and transmitting coded information. A first coupling device is provided for receiving a signal transmitted via one of a magnetic field and an electric field. A power circuit is connected to the first coupling device for deriving operating power from the received signal for use by the circuitry. A second coupling device is connected to the circuitry for transmitting coded information stored by the circuitry via the other one of the m...

A personal identification tag for notation of name, address, medical information, etc. which may be installed inside the shoe of the user. During distribution the paper layer made up of a notational part and a border on the edges of the notational part are attached by an adhesive layer to a clear plastic overlay. The backing of the paper layer is removable from the adhesive layer. During installation, the boarder is removed from the tag and discarded. In another embodiment, the paper layer serve...

An identification card comprises a center core layer, a photograph embedded in the core layer, a first assembly of multiple layers laminated on the upper surface of the core layer and the photograph, and a second assembly of multiple layers laminated on the back surface of the core layer and the photograph. The layers of the first and second assemblies have substantially similar thermal expansion properties. Accordingly, the thickness of the identification card is uniform since the thickness of ...

An identification system including a card bearing a code, in combination with a means operable by a holder of the card for hiding a selected portion of the code for creating a subcode associated with the proper holder.

An identification band comprising a backing strip having pressure-sensitive adhesive thereon, two release strips on the adhesive, and an overlying transparent strip including a tongue extending at one end of the backing strip, the transparent strip being secured to the backing strip by the adhesive, one release strip being removable for application of a pre-printed insert to the backing strip, the insert then being covered by the transparent strip, the other release strip being removable for adh...

A reader identifies information, such as the identity of an object at a transponder, provided in binary form by the transponder. The reader initially generates a pulse which activates the transponder into transmitting a series of signals, such as by magnetic induction, to the reader. Upon each count of a particular number of signals in the reader, the reader generates an additional pulse which causes the transponder to transmit a new series of signals to the reader. The generation of the pulses ...

The invention comprises an animal identification tag. The tag is a plastic sheet preformed into a sspiral shape to form several overlapping spiral layers from one end to the other. The sheet is formed of resilient material whereby the outer spiral layer may be separated from the next adjacent layer along its outer edge so that a cow's tail of conventional size may be slipped between laterally of the length of the tail and the tag may be rotated to slide the tail between the spiral layers until t...