Abstract: A fuel supply system includes a fuel tank for holding a volume of fuel and a fuel reservoir disposed within the fuel tank. A fuel pump is provided for pumping fuel from the fuel reservoir to a fuel consuming device. A jet pump is provided in selective fluid communication with the fuel pump through a jet pump line to selectively aspirate fuel from the fuel tank into the fuel reservoir. A fuel level indicator is provided which is responsive to the level of fuel within the fuel reservoir and a valve which is responsive to the fuel level indicator closes the jet pump line when the fuel level indicator indicates that the fuel level reservoir contains a predetermined amount of fuel.

Abstract: A fluid pump includes an outlet for discharging fluid from the fluid pump, a housing, and a motor with a shaft that rotates about an axis. The fluid pump also includes an impeller having a first array of blades radially surrounding the axis and a second array of blades radially surrounding the first array of blades. The fluid pump also includes an inlet plate adjacent to the impeller and has an inlet for introducing fluid into the fluid pump, a first inlet plate flow channel aligned with the first array of blades and having a first inlet plate flow channel cross-sectional area, and a second inlet plate flow channel aligned with the second array of blades and having a second inlet plate flow channel cross-sectional area. The second inlet plate flow channel cross-sectional area is synchronized with the first inlet plate flow channel cross-sectional area.

Abstract: Surgical implements used during an operating procedure are detected in human tissue. Markers attached to the surgical implements change their impedance at a preselected frequency in the presence of an electromagnetic field. Each of the markers is thereby provided with signal-identifying characteristics. The signal-identifying characteristics are detected outside the operating room in an accurate, reliable manner. Potential interference with operating room electronic instrumentation is avoided, the possibility of operator error is reduced and system cost and space requirements are substantially lowered.

Abstract: Surgical implements used during an operating procedure are detected in human or animal tissue. Markers attached to the surgical implements change their impedance at a preselected frequency in the presence of an electromagnetic field. Each of the markers is thereby provided with signal-identifying characteristics. The signal-identifying characteristics are detected by a freely movable, portable detection unit from a first location proximate the patient in an accurate, reliable manner. Potential cross-interference with operating room electronic instrumentation is minimized by shielding. System cost and space requirements are substantially lowered. An accidentally retained surgical implement is discovered in a timely manner, prior to completion of surgery and before the patient has been removed from the operating room.

Abstract: Externally detectable electronic article surveillance markers are attached to surgical implements, such as sponges and surgical instruments, appointed for use in a surgical wound. The attachment mechanism facilitates detection by an external interrogating field before the wound has been closed and the patient has left the operating table. The markers are responsive to the imposition of an interrogating field produced by an electronic article surveillance system. Markers contain one or more magnetomechanically responsive elements that are urged into mechanical resonance by the interrogating field. The ring-down of the resonance and the associated dipolar electromagnetic field provide a signal-identifying characteristic detected by a detection system. Upon detection, an audible or visible signal is triggered to alert relevant medical personnel to the need for follow-up care and removal of the offending item. The resonance occurs at a frequency ranging from about 70 to 300 kHz.

Abstract: A miniature magnetic article surveillance system marker is adapted, when armed, to resonate at a frequency provided by an incident magnetic field applied within an interrogation zone. The marker comprises a magnetomechanical element having at least one elongated ductile strip of magnetostrictive ferromagnetic material disposed adjacent to a ferromagnetic element which, upon being magnetized, magnetically biases the strip and arms it to resonate at said frequency. A substantial change in effective magnetic permeability of the marker at the resonant frequency provides the marker with signal identity.

Abstract: A miniature magnetic article surveillance system marker is adapted, when armed, to resonate at a frequency provided by an incident magnetic field applied within an interrogation zone. The marker comprises a magnetomechanical element having at least one elongated ductile strip of magnetostrictive ferromagnetic material disposed adjacent to a ferromagnetic element which, upon being magnetized, magnetically biases the strip and arms it to resonate at said frequency. A substantial change in effective magnetic permeability of the marker at the resonant frequency provides the marker with signal identity.

Abstract: Externally detectable electronic article surveillance markers are attached to surgical implements, such as sponges and surgical instruments, appointed for use in a surgical wound. The attachment mechanism facilitates detection by an external interrogating field before the wound has been closed and the patient has left the operating table. The markers are responsive to the imposition of an interrogating field produced by an electronic article surveillance system. Markers contain one or more magnetomechanically responsive elements that are urged into mechanical resonance by the interrogating field. The ring-down of the resonance and the associated dipolar electromagnetic field provide a signal-identifying characteristic detected by a detection system. Upon detection, an audible or visible signal is triggered to alert relevant medical personnel to the need for follow-up care and removal of the offending item. The resonance occurs at a frequency ranging from about 70 to 300 kHz.

Abstract: Surgical implements used during an operating procedure are detected in human or animal tissue. Markers attached to the surgical implements change their impedance at a preselected frequency in the presence of an electromagnetic field. Each of the markers is thereby provided with signal-identifying characteristics. The signal-identifying characteristics are detected by a freely movable, portable detection unit from a first location proximate the patient in an accurate, reliable manner. Potential cross-interference with operating room electronic instrumentation is minimized by shielding. System cost and space requirements are substantially lowered. An accidentally retained surgical implement is discovered in a timely manner, prior to completion of surgery and before the patient has been removed from the operating room.

Abstract: An apparatus monitors the departure of a child from an exit. The apparatus comprises: a magnetomechanically actuated electronic article surveillance system having an alarm; and a tag worn by the child. A field generating means of the system is adapted to generate an electromagnetic field at the exit. The tag is operative in the presence of the electromagnetic field to transmit a signal, which upon being detected, triggers the alarm. When the child passes through the electromagnetic field and departs from the exit, the tag transmits a signal that activates the alarm, thereby providing information to relatives of the child and store personnel concerning the child's whereabouts.

Abstract: Surgical implements used during an operating procedure are detected in human tissue. Markers attached to the surgical implements change their impedance at a preselected frequency in the presence of an electromagnetic field. Each of the markers is thereby provided with signal-identifying characteristics. The signal-identifying characteristics are detected outside the operating room in an accurate, reliable manner. Potential interference with operating room electronic instrumentation is avoided, the possibility of operator error is reduced and system cost and space requirements are substantially lowered.

Abstract: An apparatus monitors the movement of a person through an exit. The apparatus comprises an electronic article surveillance system adapted to generate an electromagnetic field at the exit and a tag worn by the person. The tag is responsive to the electromagnetic field. It is caused to alarm upon departure of the person from the exit. The tag is further provided with an alarm means for alarming the electronic article surveillance system.

Abstract: A license plate number for any vehicle extant within a field of view of an electronic camera is interpreted as a character sequence group in an image. Each character sequence group found in the image is converted to machine readable format by an optical character recognition engine and compared with a database having a plurality of license plate numbers and associated records. Each matching license plate number and associated record is displayed within the surveillance vehicle.

Abstract: A license plate number for any vehicle extant within a field of view of an electronic camera is interpreted as a character sequence group in an image. Each character sequence group found in the image is converted to machine readable format by an optical character recognition engine and compared with a database having a plurality of license plate numbers and associated records. Each matching license plate number and associated record is displayed within the surveillance vehicle.

Abstract: An apparatus monitors the departure of a child from an exit. The apparatus comprises: a magnetomechanically actuated electronic article surveillance system having an alarm; and a tag worn by the child. A field generating means of the system is adapted to generate an electromagnetic field at the exit. The tag is operative in the presence of the electromagnetic field to transmit a signal, which upon being detected, triggers the alarm. When the child passes through the electromagnetic field and departs from the exit, the tag transmits a signal that activates the alarm, thereby providing information to relatives of the child and store personnel concerning the child's whereabouts.

Abstract: An apparatus monitors the movement of a person through an exit. The apparatus comprises an electronic article surveillance system adapted to generate an electromagnetic field at the exit and a tag worn by the person. The tag is responsive to the electromagnetic field. It is caused to alarm upon departure of the person from the exit. The tag is further provided with an alarm means for alarming the electronic article surveillance system.

Abstract: An apparatus monitors the departure of a child from an exit. The apparatus comprises: an electronic article surveillance system adapted to generate an electromagnetic field at the exit; and a tag worn by the child, the tag being responsive to the electromagnetic field. The tag is caused to alarm upon departure of the child from the exit. Optionally, the tag is provided with an alarm means for alarming the electronic article surveillance system.

Abstract: A low profile, dual purpose antenna for simultaneous UHF and LF use has two coplanar antenna elements, one of which is circular and the other of which is a concentric annulus separated from it by a dielectric, as well as a third, linear antenna element extending from the center of the circular element. The circular element serves both to assist in tuning the UHF section of the antenna and as a voltage probe for the electrostatic component of the LF signal. Integrated within the antenna housing is a high input impedance, low noise amplifier for bandwidth limiting the LF signals. A coaxial feeder cable serves to connect both UHF and LF sections of the antenna to external equipment. Entry for the coaxial feeder cable into the antenna housing is through a threaded collar, which also acts as a single point fixing of the antenna to the roof of a vehicle.

Abstract: Torque on a rotating or stationary shaft is measured by an apparatus that includes a light source for emitting light along a light path; a reflection grating fixed to the shaft along the light path reflecting and diffracting the light; and a light detector having a plurality of light detecting elements for receiving the reflected and diffracted light. Torque on the shaft produces a change in the grating spacing of the grating, which in turn produces a change of diffraction angle of the reflected light, thereby causing a different element of the light detector to receive the light.

Abstract: A magnetic theft detection system marker is adapted to generate magnetic fields at frequencies that (1) are harmonically related to an incident magnetic field applied within an interrogation zone and (2) have selected tones that provide the marker with signal identity. The marker is an elongated, ductile strip of amorphous ferromagnetic material having a value of magnetostriction near zero that retains its signal identity under stress.