David E Hagan

US Patent:

6476966, Nov 5, 2002

Filed:

Aug 31, 2000

Appl. No.:

09/654931

Inventors:

David J. Hagan - Oviedo FL

Assignee:

University of Central Florida - Orlando FL

International Classification:

G02B 530

US Classification:

359484, 359500, 359501, 359900, 359483, 349193, 349194

Abstract:

A useful optical device to provide continuously variable rotation of polarization of linearly polarized light in a wavelength-independent manner. This device features a cell of twisted nematic liquid crystal sandwiched between an input window and a rotatable output window, both with surfaces prepared so as to orient the nematic liquid crystal molecules. This optical device has different applications such as: variable-angle polarization rotator; using broad band polarizers as an energy attenuator; working in both cases as a wavelength independent and temporal pulse width independent device. The low cost, the very wide field of view, the wavelength and pulse width independence, the high efficiency, and its mechanical simplicity make of this new optical device a very useful and novel invention.

US Patent:

20140051191, Feb 20, 2014

Filed:

Nov 19, 2012

Appl. No.:

13/680408

Inventors:

University of Central Florida Research Foudation I - , US
David J. Hagan - Oviedo FL, US

Assignee:

UNIVERSITY OF CENTRAL FLORIDA RESEARCH FOUNDATION INC. - Orlando FL

International Classification:

H01L 21/268
H01L 21/66
H01L 21/428

US Classification:

438 17, 438795, 438796, 2504922

Abstract:

An extremely non-degenerate two photon absorption (END-2PA) method and apparatus provide for irradiating a semiconductor material substrate simultaneously with two photons each of different energy less than a bandgap energy of the semiconductor material substrate but in an aggregate greater than the bandgap energy of the semiconductor material substrate. A ratio of a higher energy photon energy to a lower energy photon energy is at least about 3.0. Alternatively, or as an adjunct, the higher energy photon has an energy at least about 75% of the bandgap energy and the lower energy photon has an energy no greater than about 25% of the bandgap energy.

US Patent:

20150030212, Jan 29, 2015

Filed:

Jul 29, 2013

Appl. No.:

13/952691

Inventors:

- Bethesda MD, US
David Wayne HAGAN - Orlando FL, US
Christopher Thomas RICHARDSON - Oviedo FL, US
Gregory Adam ROYAL - Wheat Ridge CO, US
Steven Frederick VENABLE - Orlando FL, US

Assignee:

LOCKHEED MARTIN CORPORATION - Bethesda MD

International Classification:

G06K 9/00

US Classification:

382115

Abstract:

A system and method are provided for implementing a scheme to apply commercial web search technologies to biometric matching and identification based on converting biometric identification data to one or more text strings. Collected biometric identification information regarding particular physical traits is converted to a form that facilitates application of commercial Web search technologies to implement biometric matching and identification. A scalability of multi-modal biometric identification systems is maintained while substantially eliminating reliance on proprietary matchers and templates in support of interoperability and customer satisfaction. Separate biometric templates are converted into strings of searchable text in any combination of alpha-numerics during a standard biometric data enrollment process in order to limit the data storage requirements and streamline the later undertaken comparison process.

US Patent:

20140277086, Sep 18, 2014

Filed:

Mar 6, 2014

Appl. No.:

14/199473

Inventors:

- Bloomington IN, US
David Hagan - Bloomington IN, US

Assignee:

Cook Medical Technologies LLC - Bloomington IN

International Classification:

A61B 17/50

US Classification:

606200

Abstract:

A device for retrieval of a vena cava filter is provided. The retrieval device has, approximately, an umbrella shape and consists of a central shaft; a plurality of frame struts, attached to frame strut attachment points on the central shaft and disposed radially about the central shaft; and a plurality of snare wires. The retrieval device has a collapsed configuration for insertion and removal from a blood vessel of a patient and an expanded state for capturing an intravascular filter in the blood vessel of the patient. The plurality of snare wires provides multiple points at which a vena cava filter, particularly one that has become misaligned during deployment or treatment, can be caught. The frame struts can be substantially sinusoidal in shape and made of shape memory metal, such as Nitinol. The snare wires can be made of a biocompatible material such as silk, polyester, polypropylene, or nylon.