Daniel P O'Brien

US Patent:

7864505, Jan 4, 2011

Filed:

Nov 9, 2006

Appl. No.:

11/594862

Inventors:

Daniel J. O'Brien - Forest Hill MD, US
Eric D. Wetzel - Baltimore MD, US

Assignee:

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

International Classification:

H01G 4/06
H01G 4/005

US Classification:

361311, 361303

Abstract:

A structural capacitor includes at least one pair of electrodes comprising a positive electrode and a negative electrode, with a body of dielectric material disposed therebetween. The combination of the electrodes and dielectric has a stiffness which can be between 10 1000 GPa, and in some instances between 50 MPa-100 GPa. Failure strength of the combination can be between 1 MPa-10 GPa, and in specific instances between 10 MPa-1 GPa. The capacitor may include a plurality of electrode pairs. The dielectric may include a reinforcing material therein, and the capacitors may be configured in a variety of shapes so as to function as structural elements for articles of construction.

US Patent:

8069947, Dec 6, 2011

Filed:

Apr 21, 2010

Appl. No.:

12/764872

Inventors:

Judit A. Quasney - Silver Spring MD, US
Franklin Koh - Potomac MD, US
John P. Jenkins - Frederick MD, US
Robert M. Alexander - Mount Airy MD, US
Daniel P. O'Brien - Boonsboro MD, US

Assignee:

The United States of America as represented by the Secretary, Department of Health and Human Services - Washington DC

International Classification:

E04F 17/04

US Classification:

181224, 181225

Abstract:

A sound attenuation canopy for reducing levels of sound passing through an opening comprises a sound absorbing member. The sound absorbing member is comprised of a flexible sound absorbing material and has a first end, a second end and an intermediate portion extending between the first end and the second end. The first end is configured to attach to a periphery of the opening at a first location, the second end is configured to attach to a periphery of the opening at a second location and the intermediate portion is configured to be spaced apart from the opening. When the first end and the second end of the sound absorbing member are attached to the periphery of the opening, at least one side opening is at least partially defined by the intermediate portion and the perimeter of the opening, and a sound transmission flow path through open space between the opening and the side opening comprises at least one change of direction greater than 45 degrees.

US Patent:

8316986, Nov 27, 2012

Filed:

Nov 22, 2011

Appl. No.:

13/303063

Inventors:

Judit A. Quasney - Silver Spring MD, US
Franklin Koh - Potomac MD, US
John P. Jenkins - Frederick MD, US
Robert M. Alexander - Mount Airy MD, US
Daniel P. O'Brien - Boonsboro MD, US

Assignee:

The United States of America, as represented by the Secretary of the Department of Health and Human Services - Washington DC

International Classification:

E04F 17/04

US Classification:

181224, 181284, 181 30

Abstract:

A sound attenuation canopy for reducing levels of sound passing through an opening comprises a sound absorbing member. The member is comprised of a flexible sound absorbing material and has a first end, a second end and an intermediate portion extending therebetween. The first end is configured to attach to the opening's periphery at a first location, the second end is configured to attach to the periphery at a second location and the intermediate portion is configured to be spaced apart from the opening. When the first end and the second end are attached to the periphery of the opening, at least one side opening is at least partially defined by the intermediate portion and the perimeter of the opening, and a sound transmission flow path through open space between the opening and the side opening comprises at least one change of direction greater than 45 degrees.

US Patent:

50597639, Oct 22, 1991

Filed:

Jun 6, 1990

Appl. No.:

7/534452

Inventors:

Daniel R. O'Brien - Franklin MA
Charles H. Cox - Carlisle MA
Carlton D. Hoyt - Reading MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

B23K 2600

US Classification:

21912169

Abstract:

A method of forming optical quality surfaces in optical material is described. In particular, high optical quality end face surfaces are provided in diffused channel waveguides formed on LiNbO. sub. 3 crystal material, or the like. A T-shaped trench is first formed by laser ablation. The top of the "T" bisects a plane orthogonal to and passing through the waveguide. The lower part of the "T" is centered on the longitudinal axis of the waveguide and retains an optical fiber abutting the end face. A diamond polishing wheel is inserted in the top trench to polish the end face prior to affixing the fiber optic.

US Patent:

20180233290, Aug 16, 2018

Filed:

Apr 13, 2018

Appl. No.:

15/952646

Inventors:

- Adelphi MD, US
Daniel J. O'Brien - Hydes MD, US
Eric D. Wetzel - Baltimore MD, US
Oleg B. Yurchak - Montgomery Village MD, US

International Classification:

H01G 4/30
H01G 4/20
H01G 4/232
H01G 4/18
H01G 4/16

Abstract:

A structural capacitor having a plurality of planar dielectric layers and a plurality of positive and negative electrodes with the positive and negative electrodes alternating between each dielectric layer. First and second spaced apart holes are provided through each dielectric layer as well as the electrodes so that the first holes in the electrodes register with the first holes in the dielectric layer and likewise for the second holes. The capacitor is formed by stacking the dielectric layers and electrodes on two spaced apart alignment pins with a positive alignment pin extending through the first holes and a negative alignment pin extending through the second holes in the dielectric layers and electrodes. These alignment pins maintain layer alignment during subsequent thermal and pressure processing to bond together the dielectric and electrode layers into an integral structural material. After processing, the alignment pins are removed and replaced with electrode pins, where the positive electrode pin is in electrical contact only with the positive electrodes and the negative electrode pin is in electrical contact only with the negative electrodes. The electrode pins are used for subsequent electrical and mechanical connectorization to the structural capacitor.

US Patent:

20160254093, Sep 1, 2016

Filed:

Feb 27, 2015

Appl. No.:

14/633616

Inventors:

- Adelphi MD, US
Daniel J. O'Brien - Hydes MD, US
Eric D. Wetzel - Baltimore MD, US
Oleg B. Yurchak - Montgomery Village MD, US

International Classification:

H01G 4/30
H01G 4/232
H01G 4/008
H01G 4/005
H01G 4/16
H01G 4/18

Abstract:

A structural capacitor having a plurality of planar dielectric layers and a plurality of positive and negative electrodes with the positive and negative electrodes alternating between each dielectric layer. First and second spaced apart holes are provided through each dielectric layer as well as the electrodes so that the first holes in the electrodes register with the first holes in the dielectric layer and likewise for the second holes. The capacitor is formed by stacking the dielectric layers and electrodes on two spaced apart alignment pins with a positive alignment pin extending through the first holes and a negative alignment pin extending through the second holes in the dielectric layers and electrodes. These alignment pins maintain layer alignment during subsequent thermal and pressure processing to bond together the dielectric and electrode layers into an integral structural material. After processing, the alignment pins are removed and replaced with electrode pins, where the positive electrode pin is in electrical contact only with the positive electrodes and the negative electrode pin is in electrical contact only with the negative electrodes. The electrode pins are used for subsequent electrical and mechanical connectorization to the structural capacitor.