David K Trumper Deceased601 Center St UNIT 409, Phoenixville, PA 19460

7117790, Oct 10, 2006

Jan 10, 2003

10/340537

Amar Maruti Kendale - Somerville MA, US
David L. Trumper - Plaistow NH, US

Massachusetts Institute of Technology - Cambridge MA

B41K 1/38

101327, 101333, 1014011

A microcontact printing tool having a print unit including a stamp head with a stamp and a wafer chuck for retaining a substrate. The stamp contained by the stamped head movable relative to the substrate by an actuator and a stage. A plurality of sensors detect the position of the stamp relative to substrate. A method of using the printing tool that includes a real-time feedback for consistent and accurate application of force during the printing of the substrate. The stamp head includes a pressure chamber carrying the stamp. The stamp backing is deflected prior to contact of the stamp with the substrate to form a minimum point and the stamp backing and the stamp is returned to a plane to create a printing propagation contact. An apparatus and method of producing the stamp on a stamp backing. The apparatus has a master backing and a stamping backing in close proximity and the stamp material drawn in through a vacuum.

7275468, Oct 2, 2007

May 29, 2003

10/448336

Richard C. Montesanti - Cambridge MA, US
David L. Trumper - Plaistow NH, US

Massachusetts Institute of Technology - Cambridge MA

B23B 29/16

82 111, 82157, 82158

A high bandwidth rotary fast tool servo provides tool motion in a direction nominally parallel to the surface-normal of a workpiece at the point of contact between the cutting tool and workpiece. Three or more flexure blades having all ends fixed are used to form an axis of rotation for a swing arm that carries a cutting tool at a set radius from the axis of rotation. An actuator rotates a swing arm assembly such that a cutting tool is moved in and away from the lathe-mounted, rotating workpiece in a rapid and controlled manner in order to machine the workpiece. A pair of position sensors provides rotation and position information for a swing arm to a control system. A control system commands and coordinates motion of the fast tool servo with the motion of a spindle, rotating table, cross-feed slide, and in-feed slide of a precision lathe.

7437980, Oct 21, 2008

Jun 1, 2004

10/858482

David L. Trumper - Plaistow NH, US

Massachusetts Institute of Technology - Cambridge MA

H02K 41/00
B23B 29/16

82157, 310 12

A high bandwidth rotary fast tool servo provides tool motion in a direction nominally parallel to the surface-normal of a workpiece at the point of contact between the cutting tool and workpiece. Three or more flexure blades having all ends fixed are used to form an axis of rotation for a swing arm that carries a cutting tool at a set radius from the axis of rotation. An actuator rotates a swing arm assembly such that a cutting tool is moved in and away from the lathe-mounted, rotating workpiece in a rapid and controlled manner in order to machine the workpiece. A pair of position sensors provides rotation and position information for a swing arm to a control system. A control system commands and coordinates motion of the fast tool servo with the motion of a spindle, rotating table, cross-feed slide, and in-feed slide of a precision lathe.

7492117, Feb 17, 2009

Jul 20, 2006

11/490988

Richard C. Montesanti - Pleasanton CA, US
David L. Trumper - Plaistow NH, US

Lawrence Livermore National Security, LLC - Livermore CA

G05B 11/01
H02P 25/08

318687, 318135, 318701, 31840041

The present invention provides a variable reluctance actuator system and method that can be adapted for simultaneous rotation and translation of a moving element by applying a normal-direction magnetic flux on the moving element. In a beneficial example arrangement, the moving element includes a swing arm that carries a cutting tool at a set radius from an axis of rotation so as to produce a rotary fast tool servo that provides a tool motion in a direction substantially parallel to the surface-normal of a workpiece at the point of contact between the cutting tool and workpiece. An actuator rotates a swing arm such that a cutting tool moves toward and away from a mounted rotating workpiece in a controlled manner in order to machine the workpiece. Position sensors provide rotation and displacement information for a swing arm to a control system. A control system commands and coordinates motion of the fast tool servo with the motion of a spindle, rotating table, cross-feed slide, and in feed slide of a precision lathe.

7574947, Aug 18, 2009

Sep 14, 2004

10/940427

Richard C. Montesanti - Cambridge MA, US
David L. Trumper - Plaistow NH, US

Massachusetts Institute of Technology - Cambridge MA

B23B 29/16
B23B 5/00

82 111, 82157, 82158

A high bandwidth rotary fast tool servo provides tool motion in a direction nominally parallel to the surface-normal of a workpiece at the point of contact between the cutting tool and workpiece. Three or more flexure blades having all ends fixed are used to form an axis of rotation for a swing arm that carries a cutting tool at a set radius from the axis of rotation. An actuator rotates a swing arm assembly such that a cutting tool is moved in and away from the lathe-mounted, rotating workpiece in a rapid and controlled manner in order to machine the workpiece. One or more position sensors provides rotation and position information for a swing arm to a control system. A control system commands and coordinates motion of the fast tool servo with the motion of a spindle, rotating table, cross-feed slide, and in-feed slide of a precision lathe.

7616084, Nov 10, 2009

Oct 29, 2004

10/977122

Xiaodong Lu - Cambridge MA, US
David L. Trumper - Plaistow NH, US

Massachusetts Institute of Technology - Cambridge MA

H01F 7/00
H01F 7/20

335229, 335285, 269 8

The preferred embodiments of the present invention are directed to high bandwidth positioning systems such as fast tool servos (FTS). The applications of this invention include, for example, diamond turning of mold with structured surface for mass production of films for brightness enhancement and controlled reflectivity, diamond turning of molds for contact lens and micro-optical positioning devices. Preferred embodiments of the fast tool servo can have a closed-loop bandwidth of approximately 205 kHz, with acceleration of up to approximately 1000 G or more. The resolution or position error is approximately 1 nm root mean square (RMS). In a preferred embodiment, the full stroke of 50 μm can be achieved up to 1 kHz operation.

7665983, Feb 23, 2010

Aug 17, 2006

11/506009

Amar Maruti Kendale - Somerville MA, US
David L. Trumper - Plaistow NH, US

Massachusetts Institute of Technology - Cambridge MA

B29C 45/00
A23G 3/12
A23G 1/20
A01J 25/13
B29C 33/46
B29C 45/14

425546, 425542, 425127, 4251291, 4254051, 425808, 425DIG 60, 249117, 249141, 264259

A microcontact printing tool having a print unit including a stamp head with a stamp and a wafer chuck for retaining a substrate. The stamp contained by the stamped head movable relative to the substrate by an actuator and a stage. A plurality of sensors detect the position of the stamp relative to substrate. A method of using the printing tool that includes a real-time feedback for consistent and accurate application of force during the printing of the substrate. The stamp head includes a pressure chamber carrying the stamp. The stamp backing is deflected prior to contact of the stamp with the substrate to form a minimum point and the stamp backing and the stamp is returned to a plane to create a printing propagation contact. An apparatus has a master backing and a stamping backing in close proximity and the stamp material drawn in through a vacuum. The stamp is separated from the master by use of a parting fluid.

7765905, Aug 3, 2010

Apr 20, 2007

11/738071

David Trumper - Plaistow NH, US
David Cuff - Oshkosh WI, US

Massachusetts Institute of Technology - Cambridge MA

H02K 41/00
B23B 29/16

82157, 318135

A micropositioner is provided, which contains an outer magnetic pole-piece and an inner magnetic pole-piece located within the outer magnetic pole piece. At least one permanent magnet is located between the inner magnetic pole piece and the outer magnetic pole-piece. At least one coil is located between the inner magnetic pole-piece and the outer magnetic pole-piece, wherein the at least one coil is capable of directing magnetic flux between the inner magnetic pole-piece and the outer magnetic pole-piece. An outer movable shell is also movably connected to the outer magnetic pole-piece.