Neil A Gershenfeld

Author:

Neil A. Gershenfeld

ISBN #:

0201626012

Author:

Neil A. Gershenfeld

ISBN #:

0201626020

Author:

Neil Gershenfeld

ISBN #:

0521570956

Author:

Neil Gershenfeld

ISBN #:

0521580447

Author:

Neil Gershenfeld

ISBN #:

0465027458

Author:

Neil Gershenfeld

ISBN #:

0465027466

Author:

Neil Gershenfeld

ISBN #:

0805058745

US Patent:

6460557, Oct 8, 2002

Filed:

Oct 27, 2000

Appl. No.:

09/697868

Inventors:

Jeremy Levitan - Cambridge MA
Neil Gershenfeld - Somerville MA
Ernesto Blanco - Belmont MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

F15B 13044

US Classification:

137 1, 13762565, 2511291

Abstract:

In a hydraulic or pneumatic flow-control valve, the valve stem itself is made a part of a solenoid arrangement that effects its reciprocation. The valve stem is magnetically responsive (e. g. , magnetically permeable or ferromagnetic), and a magnetic field is applied to the stem to cause it to move within the bore of the valve housing; there is no external element required to urge the valve stem into movement. The valve stem is typically sealed permanently within the bore.

US Patent:

6472987, Oct 29, 2002

Filed:

Jul 14, 2000

Appl. No.:

09/617249

Inventors:

Neil Gershenfeld - Somerville MA
Richard Fletcher - Cambridge MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G08B 1314

US Classification:

3405724, 3405726, 3405722

Abstract:

Tags encode information by means of spatial inhomogeneities that may be detected in the time domain; in effect, characteristics in space are transformed into time for sensing purposes. Such tags may be very inexpensively produced yet carry appreciable quantities of data. The inhomogeneities may be obtained by simple physical modifications to, or externally applied field biases operating on, materials that are very inexpensive to procure.

US Patent:

6493933, Dec 17, 2002

Filed:

Oct 18, 2000

Appl. No.:

09/691739

Inventors:

E. Rehmi Post - Cambridge MA
Neil Gershenfeld - Somerville MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H05K 310

US Classification:

29846, 29825, 29832

Abstract:

Stitchable electrical components have flexible, conductive leads and are encased, at least partially, in sealed packages. Conductive threads, yarns, or fiber bundles are patterned onto a flexible substrate (e. g. , a textile panel). To form a circuit, the component leads are conductively stitched, spot welded, or otherwise joined to a textile panel so as to form connections between at least some of the stitched leads so as to form an electrical circuit. Alternatively, leads stitched into or otherwise joined to a textile pattern may be welded or otherwise permanently joined to flexible or non-flexible component leads to form a circuit. Multiple panels of circuitry so formed may then be physically and electrically joined at various locations by a combination of stitching, welding, and/or other joining means, preferably with interposed insulating layers, to form a multilayer flexible circuit.

US Patent:

6584214, Jun 24, 2003

Filed:

Oct 19, 1999

Appl. No.:

09/419756

Inventors:

Ravikanth Pappu - Cambridge MA
Neil Gershenfeld - Somerville MA
Joshua R. Smith - Cambridge MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G06K 900

US Classification:

382108, 382195, 382206, 340 586

Abstract:

Three-dimensional characteristics of a complex physical structure are used to generate a unique identifier. In effect, the characteristics reperesent the basis of a âphysical one-way hash functionâ that faciliates ready derivation of an identifier based on the physical structure, the structure itself being very difficult to reproduce given only the identifier. The characteristics may be read using a non-contact probe and without the need for precise registration.

US Patent:

6642837, Nov 4, 2003

Filed:

Oct 19, 1999

Appl. No.:

09/420829

Inventors:

Benjamin Vigoda - Cambridge MA
Neil Gershenfeld - Somerville MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H04Q 522

US Classification:

340 101, 340 1051, 34082572, 340562, 200DIG 2, 200600, 341 33

Abstract:

Physical structures respond to proximity or touch, conveying to a reader information such as the identity of the structure or some data associated therewith. In its simplest form, the structure comprises an electrical load and a pair of electrodes connected thereto. The electrodes are spaced apart (by air or other dielectric medium). A signal generator, which acts as a âreader,â is connected to a larger electrode that may be embedded in an environmental surface. When the structure is placed in proximity to the reader electrode, application of the signal results in capacitive coupling between the reader and the electrodes of the structure. The structure is not detected by the reader, however, because the capacitive coupling is comparable for both electrodes, so the load experiences only a small electrical gradient. But if one of the electrodes is grounded, this symmetry is broken and current is drawn through the load. In general, grounding occurs when a person, coupled (even weakly) to environmental groundâe. g.

US Patent:

6693540, Feb 17, 2004

Filed:

Oct 16, 2002

Appl. No.:

10/272482

Inventors:

Neil Gershenfeld - Somerville MA
Richard Fletcher - Cambridge MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G08B 1314

US Classification:

3405724, 3405722, 3405726

Abstract:

Tags encode information by means of spatial inhomogeneities that may be detected in the time domain; in effect, characteristics in space are transformed into time for sensing purposes. Such tags may be very inexpensively produced yet carry appreciable quantities of data. The inhomogeneities may be obtained by simple physical modifications to, or externally applied field biases operating on, materials that are very inexpensive to procure.

US Patent:

6724310, Apr 20, 2004

Filed:

Oct 10, 2000

Appl. No.:

09/685819

Inventors:

Neil Gershenfeld - Somerville MA
Richard Fletcher - Cambridge MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G08B 1314

US Classification:

3405724, 3405721, 3405722, 3405725

Abstract:

Wireless tags have a plurality of non-equivalent current pathways, each of which responds differently to an interrogation signal and collectively represent encoded information. The element is subjected to the signal, stimulating the current pathways, each of which contributes to an overall element response. The individual contributions and, hence, the information may be recovered from this overall response. The response of each of the pathways to the signal may vary in terms of one or more of resonant frequency, amplitude, damping, and Q factor.

US Patent:

6891382, May 10, 2005

Filed:

Oct 14, 2003

Appl. No.:

10/684817

Inventors:

E. Rehmatulla Post - Somerville MA, US
Neil Gershenfeld - Somerville MA, US

Assignee:

Massachusetts Instiute of Technology - Cambridge MA

International Classification:

G01R027/26

US Classification:

324663, 324662

Abstract:

Three-dimensional characterization wherein an object interacts capacitively with a resistive medium and the object's orientation, mass distribution and/or distance from the medium is characterized by electrodes distributed linearly around the medium's perimeter. Thus, three-dimensional characteristics are projected into two dimensions and sensed along a single dimension.