Robert E Newnham

US Patent:

6614143, Sep 2, 2003

Filed:

Aug 29, 2001

Appl. No.:

09/942272

Inventors:

Jindong Zhang - Lansdale PA
Robert E. Newnham - State College PA

Assignee:

The Penn State Research Foundation - University Park PA

International Classification:

H01L 4104

US Classification:

310317, 310328

Abstract:

An electro active device for generating a directional beam includes first and second electro active substrates each having first and second opposed continuous planar surfaces wherein each of the first opposed surfaces have a polarity and each of the second opposed surfaces have an opposite polarity. The first opposed surfaces of the first and second electro active substrates are in close contact. A first electrode is coupled to a junction formed by the first opposed surfaces having the same polarity, a second electrode is coupled to the second opposed surface of the first electro active substrate, and a third electrode is coupled to the second opposed surface of the second electro active substrate. A first endcap is joined to the second opposed surface of the first electro active substrate and a second endcap is joined to the second opposed surface of the second electro active substrate.

US Patent:

6654993, Dec 2, 2003

Filed:

Apr 17, 2001

Appl. No.:

09/836441

Inventors:

Jindong Zhang - State College PA
Robert E. Newnham - State College PA

Assignee:

The Penn State Research Foundation - University Park PA

International Classification:

H04R 1700

US Classification:

29 2535, 295921, 29594, 29847, 310363, 310371, 427190, 427191, 427227

Abstract:

A process for fabricating a ceramic electroactive transducer of a predetermined shape is disclosed. The process comprises the steps of providing a suitably shaped core having an outer surface, attaching a first conductor to the outer surface of the core, coating an inner conductive electrode on the the outer surface of the core such that the inner conductive electrode is in electrical communication with the first conductor, coating a ceramic layer onto the inner electrode, thereafter sintering the ceramic layer, coating an outer electrode onto the sintered ceramic layer to produce an outer electrode that is not in electrical communication with the first conductor, and then poling the sintered ceramic layer across the inner electrode and the outer electrode to produce the ceramic electrode.

US Patent:

7019445, Mar 28, 2006

Filed:

Oct 10, 2003

Appl. No.:

10/683019

Inventors:

Jindong Zhang - State College PA, US
Robert E. Newnham - State College PA, US

Assignee:

The Penn State Research Foundation - University Park PA

International Classification:

H01L 41/08

US Classification:

310367, 29 2535, 29594, 427191, 427227, 310328

Abstract:

A process for fabricating a ceramic electroactive transducer of a predetermined shape is disclosed. The process comprises the steps of providing a suitably shaped core having an outer surface, attaching a first conductor to the outer surface of the core, coating an inner conductive electrode on the the outer surface of the core such that the inner conductive electrode is in electrical communication with the first conductor, coating a ceramic layer onto the inner electrode, thereafter sintering the ceramic layer, coating an outer electrode onto the sintered ceramic layer to produce an outer electrode that is not in electrical communication with the first conductor, and then poling the sintered ceramic layer across the inner electrode and the outer electrode to produce the ceramic electrode.

US Patent:

7437817, Oct 21, 2008

Filed:

Jan 11, 2006

Appl. No.:

11/329464

Inventors:

Jindong Zhang - State College PA, US
Robert E. Newnham - State College PA, US

Assignee:

The Penn State Research Foundation - University Park PA

International Classification:

H04R 31/00

US Classification:

29594, 295921, 296021, 310328, 310371, 427189, 427190, 427191, 427192, 427227

Abstract:

A process for fabricating a ceramic electroactive transducer of a predetermined shape is disclosed. The process comprises the steps of providing a suitably shaped core having an outer surface, attaching a first conductor to the outer surface of the core, coating an inner conductive electrode on the outer surface of the core such that the inner conductive electrode is in electrical communication with the first conductor, coating a ceramic layer onto the inner electrode, thereafter sintering the ceramic layer, coating an outer electrode onto the sintered ceramic layer to produce an outer electrode that is not in electrical communication with the first conductor, and then poling the sintered ceramic layer across the inner electrode and the outer electrode to produce the ceramic electrode.

US Patent:

44121482, Oct 25, 1983

Filed:

Apr 24, 1981

Appl. No.:

6/257289

Inventors:

Kenneth A. Klicker - Whitehall PA
Robert E. Newnham - State College PA
Leslie E. Cross - State College PA
James V. Biggers - State College PA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01L 4108

US Classification:

310358

Abstract:

A composite of PZT (Lead Zirconate Titanate) and a compliant polymer matrix aving 3-1 connectivity (i. e. , in a diphasic material, one of the two phases is continuously self-connected in all three mutually perpendicular directions and the second phase is self-connected only along one of the three mutually perpendicular directions) and fabrication method thereof is described. An array of parallel PZT rod elements is embedded in a mechanically compliant polymer matrix with their axes along the direction of the poling electric field. Such a composite has a high value of g. sub. h, d. sub. h and g. sub. 33 with very little sacrifice in the value of d. sub. 33.

US Patent:

H4154, Jan 5, 1988

Filed:

Apr 27, 1987

Appl. No.:

7/044398

Inventors:

Robert E. Newnham - State College PA
Basavaraj V. Hiremath - Lawrenceville NJ

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01C 710

US Classification:

338 22R

Abstract:

A multilayer thermistor and a method of making it are disclosed. The thertor has a positive temperature coefficient of resistance (PTCR) and a room temperature resistance lower than prior art thermistors of the same size. The thermistor is comprised of a plurality of layers of material having the PTCR characteristic laminated in alternation with layers of electrodes, the outer two layers of the thermistor being PTCR layers. Alternate electrodes are electrically connected in common to a pair of conductors forming thereby parallel resistance paths across each layer. The more resistance paths the thermistor has, the lower the overall resistance of the device.

US Patent:

44220030, Dec 20, 1983

Filed:

Aug 16, 1982

Appl. No.:

6/408320

Inventors:

Ahmad Safari - State College PA
Robert E. Newnham - State College PA
Leslie E. Cross - State College PA
Walter A. Schulze - State College PA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01L 4108

US Classification:

310358

Abstract:

Composites of lead zirconate titanate (PZT) and inactive polymers with 3-1 and 3-2 patterns and a method of fabrication thereof are described. Fabrication is accomplished by drilling holes in sintered PZT blocks and filling the holes with epoxy or some other inactive polymer. The influence of hole size and volume fraction PZT on the hydrostatic properties of the composite is evaluated. By decoupling the piezoelectric coefficients d. sub. 33 and d. sub. 31 in the composite, the hydrostatic coefficients are greatly enhanced.

US Patent:

44853211, Nov 27, 1984

Filed:

Jan 29, 1982

Appl. No.:

6/344098

Inventors:

Kenneth A. Klicker - Allentown PA
Robert E. Newnham - State College PA
Leslie E. Cross - State College PA
Leslie J. Bowen - Waltham MA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01L 4104

US Classification:

310322

Abstract:

A broad bandwidth electro-mechanical transducer is shaped into a wedge of varying thickness, with a plurality of PZT elements or sheets embedded in an inactive polymer. The transducer is driven at frequencies corresponding to resonance of the thickness dimensions. The piezoelectric elements with different thicknesses are decoupled mechanically from one another using an inactive polymer of low Q so as to prevent interference.