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| Number | Title | Issue Date |
| 6784788 | Universal electronic identification tag The universal electronic identification tag is for use with a variety of readers of different designs including a control reader which can be used to control the operations of the universal tag. A reader interrogates a tag by transmitting a carrier. The universal ta... | 08/31/2004 |
| 6472975 | Electronic identification system with improved sensitivity The coil in the reader that is used to establish an alternating magnetic field is transformer-coupled through capacitors to a push-pull driving circuit consisting of four field-effect transistors connected in a bridge arrangement. The coil, capacitors, an... | 10/29/2002 |
| 6414597 | Electronic identification system extended-range reader An extended-range reader for use in identifying the tag of an object. The reader includes a winding of conducting wire for generating an interrogating magnetic field. The winding may be either a coil assembly consisting of a plurality of coils spaced at i... | 07/02/2002 |
| 6249212 | Universal electronic identification tag The universal electronic identification tag is for use with a variety of readers of different designs including a control reader which can be used to control the operations of the universal tag. A reader interrogates a tag by transmitting a carrier. The u... | 06/19/2001 |
| 5559507 | Signal transmission and tag reading circuit for an inductive reader A field coil signal transmission and tag reading circuit is disclosed for use in an inductive tag reader system. The circuit is coupled to an oscillator which provides a drive signal to a differential driver. The driver transforms the clock signal into fi... | 09/24/1996 |
| 5484403 | Hypodermic syringe for implanting solid objects The hypodermic syringe for implanting objects in the bodies of birds, fish, animals, and humans consists of a barrel, a canula attached to one end of the barrel, and a plunger that can be moved back and forth within the barrel. A user implants an object b... | 01/16/1996 |
| 5465556 | Container providing selective access to stored objects A container providing selective access to stored objects consists of a plurality of cells for storing objects and a mechanism for causing the cells to open and close in accordance with a control pattern that specifies the cells that are to be opened and t... | 11/14/1995 |
| 5266926 | Signal transmission and tag power consumption measurement circuit for an inductive reader A field coil signal transmission and tag power consumption measurement circuit for use in an inductive tag reader system. The circuit is coupled to an oscillator which provides a drive signal to a differential driver. The driver transforms the clock signa... | 11/30/1993 |
