Patents by Inventor Placid M. Ferreira

Placid M. Ferreira has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20090050487
    Abstract: Disclosed herein are electrochemical fabrication platforms for making structures, arrays of structures and functional devices having selected nanosized and/or microsized physical dimensions, shapes and spatial orientations. Methods, systems and system components use an electrochemical stamping tool such as solid state polymeric electrolytes for generating patterns of relief and/or recessed features exhibiting excellent reproducibility, pattern fidelity and resolution on surfaces of solid state ionic conductors and in metal. Electrochemical stamping tools are capable high throughput patterning of large substrate areas, are compatible with commercially attractive manufacturing pathways to access a range of functional systems and devices including nano- and micro-electromechanical systems, sensors, energy storage devices, metal masks for printing, interconnects, and integrated electronic circuits.
    Type: Application
    Filed: May 19, 2008
    Publication date: February 26, 2009
    Inventors: Nicholas X. FANG, Placid M. FERREIRA, Keng Hao HSU, Peter Lee SCHULTZ, Kyle E. JACOBS, Anil KUMAR
  • Patent number: 7239107
    Abstract: In one embodiment, a flexure stage comprises a base, a stage, a positioning mechanism, and a control device. The base and stage have first and second portions that are spaced apart from each other. The positioning mechanism is coupled between the base and the stage. The positioning mechanism includes an actuator and a flexure structure engaged by the actuator. The flexure structure includes base links coupled to the first base portion, stage links coupled to the first stage portion, and an intermediate link coupled to both the base and stage links. All structures are coupled by flexure hinge connections. The control device generates a control signal to change position of the stage by sending a control signal to the actuator which provides a force to elastically deform the flexure structure and correspondingly move the stage.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: July 3, 2007
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Placid M. Ferreira, Qing Yao
  • Patent number: 5655956
    Abstract: The invention relates to an apparatus and process for machining a rotating workpiece by means of rotary ultrasonic grinding. The apparatus performs rotary ultrasonic grinding by rotating and vibrating a surface finishing tool in contact with a rotating workpiece. The rotary ultrasonic grinding process is a hybridized method which comprises a combination of conventional ultrasonic machining and diamond grinding. Important parameters in one embodiment of the process include ultrasonic vibration amplitude and frequency, static pressure or force, tool rotation speed, workpiece rotation speed, grit size, grit concentration, abrasive type, and bond type.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: August 12, 1997
    Assignee: University of Illinois at Urbana-Champaign
    Inventors: Placid M. Ferreira, Nitin Khanna, Zhijain Pei