Xerox Corporation

Pacesetter, Inc.

Ventritex, Inc.

Richard J Gable

Dean F Carson

Stephen David White

William A Lloyd

Lorin K Hansen

Keith E McFarland

Jack H Sayre

Edwardo D Lara

A lead sealing device that resides within the connector cavity of a pacemaker or defibrillator intended to prevent fluid intrusion by automatically sealing the lead lumen when the lead connector is inserted. The sealing mechanism may be in the form of a silicone disk located at the base of the space defined by the connector cavity in which the lead is inserted to make electrical and physical contact. It may be fixedly located at the bottom of the connector cavity, or may be a movable plug located within the connector cavity at a location other than the bottom of the cavity, such as adjacent to the connector block. In that case, the pin will make contact with the movable plug immediately after passing through the connector block, and will remain in contact with and seal the lead lumen while the pin and plug are further advanced to bring the pin into its final location to make electrical contact with the connector contact.

Lead lumen sealing device

Provided is a system for reducing unwanted background writing effects caused by an elevated OFF voltage state on a print head in an electrographic printing system. This system allows for the OFF voltage to be elevated through the use of modulated OFF states. The OFF voltage is pulsed, or modulated, between a required OFF voltage and a voltage less than the required OFF voltage, during an OFF state, thus reducing erroneous background writing events while maintaining image quality. The system provides a modulated voltage source to be used during the OFF state and an additional constant voltage source to be used during a writing state.

Background from an electrographic printer through modulated off states

A preferred embodiment of the present invention is directed to a removal of a ghost image created during a processing of a film laminate medium by an electrographic plotter. A recording of an image on the film medium induces a ghosting potential over a developing station. The ghosting potential causes a spurious image to be developed by the developing station. The recorded image is created by depositing a charge on a dielectric layer of the film. A relationship exists between the deposited charge and the ghosting potential. By use of information known to the system, the ghosting potential may be estimated and reduced. A preferred method estimates the magnitude of the ghosting potential by use of the relationship between deposited charge and ghosting potential. A counteracting potential is applied to the system to reduce the ghosting potential over the developing station. The reduction of the ghosting potential substantially removes the ghost image created during the processing of the film laminate.

Film ghost removal in electrographic plotters by voltage bias of the

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Mountain View, CA, United States of America

Richard J Gable