Abstract: A passive radio frequency identification (RFID) reader is configured to dynamically vary the Q factor of its resonant antenna coil circuit in order to optimize its performance under different conditions. This RFID reader suitably provides optimal performance for both transponder reading and transponder writing operations, rather than being designed for optimal performance for only one operation or the other, or some fixed compromise between them.

Abstract: A passive radio frequency identification (RFID) reader is configured to dynamically vary the Q factor of its resonant antenna coil circuit in order to optimize its performance under different conditions. This RFID reader suitably provides optimal performance for both transponder reading and transponder writing operations, rather than being designed for optimal performance for only one operation or the other, or some fixed compromise between them.

Abstract: A passive radio frequency identification (RFID) reader is configured to dynamically vary the Q factor of its resonant antenna coil circuit in order to optimize its performance under different conditions. This RFID reader suitably provides optimal performance for both transponder reading and transponder writing operations, rather than being designed for optimal performance for only one operation or the other, or some fixed compromise between them.

Abstract: A passive radio frequency identification (RFID) reader is configured to dynamically vary the Q factor of its resonant antenna coil circuit in order to optimize its performance under different conditions. This RFID reader suitably provides optimal performance for both transponder reading and transponder writing operations, rather than being designed for optimal performance for only one operation or the other, or some fixed compromise between them.

Abstract: A passive radio frequency identification (RFID) reader is configured to dynamically vary the Q factor of its resonant antenna coil circuit in order to optimize its performance under different conditions. This RFID reader suitably provides optimal performance for both transponder reading and transponder writing operations, rather than being designed for optimal performance for only one operation or the other, or some fixed compromise between them.

Abstract: The invention is a radio-frequency identification system consisting of a reader and a tag. The reader comprises a transmit/receive resonant circuit comprising one or more coils, a means for repeatedly driving the transmit/receive resonant circuit with pulses of a periodic signal, a means for obtaining a tag response signal from the transmit/receive resonant circuit, a means for extracting tag information from the tag response signal obtained from the transmit/receive resonant circuit, a receive resonant circuit comprising one or more coils, a means for obtaining a tag response signal from the receive resonant circuit, and a means for extracting tag information from the tag response signal obtained from the receive resonant circuit. The tag comprises a plurality of resonant circuits, a means for recognizing he presence of an interrogating magnetic field, and a means for embedding information to be communicated to the interrogating reader in at least one coil current.

Abstract: The invention is a resonant-circuit structure for enhancing the interrogation range of a radio-frequency identification system. The resonant circuit structure consists of a coil assembly and a capacitor connected in parallel with a resonance frequency equal to the frequency of the interrogating signal of the radio-frequency identification system with which the resonant circuit structure is to operate. The coil assembly and the capacitor are embedded in a structure which provides physical support for the coil assembly and the capacitor and access to a region near the coil assembly.

Abstract: The reversible mortise lock of the present invention can be installed on either the left or right side edges of a door opposite the door hinges. The lock includes a housing with a live bolt pivotally and slidably mounted in the housing. The live bolt slides between an extended position beyond the housing and a fully retracted position within the housing. When fully retracted, the live bolt can be rotated 180° so that the beveled face of the live bolt can be reversed. A finger pivotally mounted within the housing blocks full retraction of the live bolt when the mortise lock is installed in the door.

Abstract: The invention is a resonant-circuit structure for enhancing the interrogation range of a radio-frequency identification system. The resonant circuit structure consists of a coil assembly and a capacitor connected in parallel with a resonance frequency equal to the frequency of the interrogating signal of the radio-frequency identification system with which the resonant circuit structure is to operate. The coil assembly and the capacitor are embedded in a structure which provides physical support for the coil assembly and the capacitor and access to a region near the coil assembly.

Abstract: The invention is a radio-frequency identification system consisting of a reader and a tag. The reader comprises a transmit/receive resonant circuit comprising one or more coils, a means for repeatedly driving the transmit/receive resonant circuit with pulses of a periodic signal, a means for obtaining a tag response signal from the transmit/receive resonant circuit, a means for extracting tag information from the tag response signal obtained from the transmit/receive resonant circuit, a receive resonant circuit comprising one or more coils, a means for obtaining a tag response signal from the receive resonant circuit, and a means for extracting tag information from the tag response signal obtained from the receive resonant circuit. The tag comprises a plurality of resonant circuits, a means for recognizing he presence of an interrogating magnetic field, and a means for embedding information to be communicated to the interrogating reader in at least one coil current.

Abstract: A door lock includes a support seat having a recess for mounting a driven member, a control knob including a drive member rotatably mounted in the support seat to rotate the driven member and a rotation member to rotate the drive member and having an outer wall formed with an annular groove and a locking groove, and a locking pin mounted in the support seat and having a locking end selectively extended into the annular groove or the locking groove of the rotation member of the control knob. Thus, the door lock has a dead locking function to lock the door from inside to prevent the door from being unlocked from outside by a key or other tool so as to protect the user's safety inside of the door.

Abstract: A locking device for the steering wheel of a car includes a mounting tube, a retractable post mounted in the mounting tube, a press type lock mounted on the mounting tube and detachably engaged with the retractable post to lock and unlock the retractable post, a first locking member mounted on the mounting tube, and a second locking member mounted on the retractable post to move therewith. Thus, the locking hooks of the first locking member and the second locking member are rotatable to fold the locking hooks when not in use so that the locking device has a smaller volume after being folded, thereby facilitating packaging, storage and transportation of the locking device.

Abstract: A door lock includes a support seat having a recess for mounting a driven member, a control knob including a drive member rotatably mounted in the support seat to rotate the driven member and a rotation member to rotate the drive member and having an outer wall formed with an annular groove and a locking groove, and a locking pin mounted in the support seat and having a locking end selectively extended into the annular groove or the locking groove of the rotation member of the control knob. Thus, the door lock has a dead locking function to lock the door from inside to prevent the door from being unlocked from outside by a key or other tool so as to protect the user's safety inside of the door.

Abstract: A locking chuck is provided with arms that extend from the adjustment mechanism to a locking ring. The arms are biased against the teeth of the locking ring. As the outer sleeve is rotated in the tightening direction, rearward axial force is applied to the locking ring, thereby locking the locking ring against the body of the chuck. When the outer sleeve is rotated in the loosening direction, the arms rotate the locking ring to unlock the locking ring from the body.

Abstract: A lock includes a quick unlocking device and a secondary locking device. Thus, when the inner handle is rotated, the latch bolt and the dead bolt are unlocked synchronously by operation of the quick unlocking device, so that the door plate can be opened rapidly, thereby facilitating the user opening the door during the emergency condition. In addition, when the locking block is pressed inward, the locking stud of the locking block is locked in the locking hole of the locking seat to lock the control knob on the locking seat without rotation, such that the dead bolt is fixed by the control knob, thereby forming a secondary locking effect to achieve the anti-theft purpose.

Abstract: 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 intervals along a common axis or a solenoid. The winding is limited to those having values of D/L less than four where D is the smallest transverse dimension of the winding and L is the length. The winding is adapted to receive a structure within the winding for providing objects a passageway through the winding. The axis of the winding may be either straight or curved. To improve the magnetic field generating capability of the winding, a magnetic shunt encircling the winding can be added. Also included is a structure within the winding for providing objects a passageway through the winding, the structure having openings for object ingress and egress.

Abstract: The present invention relates to a novel catalyst composition and a novel process for synthesizing methyl acrylate from methyl formate and acetylene, in which methyl formate reacts with acetylene in the presence of a main catalyst comprising one or more compounds selected from RuCl.sub.3, Ni(CH.sub.3 COO).sub.2, NiBr.sub.2, NiI.sub.2, NiSO.sub.4, Ni(NO.sub.3).sub.2, PdCl.sub.2, CoCl.sub.2, Rh.sub.3 (CO).sub.12 and RhCl.sub.3, and the catalyst promoter comprising one or more compounds selected from CuSO.sub.4, NaI, KI and CH.sub.3 I, at a temperature of 120.about.240.degree. C., and under reaction pressure of 1.0.about.10.0 MPa, a molar ratio of methyl formate to acetylene ranges form 0.1:1 to 20:1. The yield of methyl acrylate may reach to 63%.

Abstract: The invention provides a bi-material tubing formed of a composite member and a noncomposite member. The tubing has a locking portion where the composite member is secured to the noncomposite member by chemically bonding alone or in combination with mechanical joining techniques. A method of making the tubing is also provided.