Elizabeth T Downing

US Patent:

7233446, Jun 19, 2007

Filed:

Aug 19, 2005

Appl. No.:

11/207275

Inventors:

Elizabeth A. Downing - Sunnyvale CA, US
Mark G. Willner - Lafayette CO, US
Robert Rewick - Mountain View CA, US

Assignee:

3DTL, Inc. - Sunnyvale CA

International Classification:

G02B 3/00
G03H 1/00

US Classification:

359642, 359 14

Abstract:

Optical elements and methods of forming optical elements are described. In one example, a method applies a photosensitive ink to a substrate and exposes the ink to create an optical element, such as an optical lens or holographic recording medium.

US Patent:

7376165, May 20, 2008

Filed:

Sep 24, 2004

Appl. No.:

10/948757

Inventors:

Elizabeth Downing - Sunnyvale CA, US
Juergen Bruegl - Los Altos CA, US

Assignee:

Bayerische Motoren Werke Aktiengesellschaft - Munich

International Classification:

H01S 5/00

US Classification:

372 5012, 372 50121

Abstract:

An apparatus and method for optically aligning output beams from multiple, individual, different-wavelength laser diodes. The output of a first laser diode is fed directly into the high-reflector of a laser diode, through the gain medium, and is output from an output coupler in each of a sequence of abutting laser diodes. The output from the last laser diode includes the individual beams from each laser diode in the same single optical axis, while retaining the original wavelengths.

US Patent:

7576920, Aug 18, 2009

Filed:

Feb 23, 2007

Appl. No.:

11/710095

Inventors:

Elizabeth A. Downing - Sunnyvale CA, US
Mark G. Willner - Lafayette CO, US
Robert Rewick - Mountain View CA, US

Assignee:

3DTL, Inc. - Sunnyvale CA

International Classification:

G02B 3/00
G02B 5/18

US Classification:

359642, 359558

Abstract:

Optical elements and methods of forming optical elements are described. In one example, a method applies a photosensitive ink to a substrate and exposes the ink to create an optical element, such as an optical lens or holographic recording medium.

US Patent:

8110281, Feb 7, 2012

Filed:

Jul 1, 2005

Appl. No.:

11/173620

Inventors:

Elizabeth A. Downing - Sunnyvale CA, US

Assignee:

3DTL, Inc. - Sunnyvale CA

International Classification:

B32B 5/16

US Classification:

428206, 428207, 428323, 428403, 428913, 428916, 283 91, 283 92

Abstract:

Methods and systems for optical effects in pigments, inks, and on media. One aspect of this disclosure involves a pigment particle which includes a core, having a fluorescent material and having a spherical shape, and a shell surrounding the core; the shell includes a photochromic material which has a first optical property in a first light source and a second optical property in a second light source which includes a set of wavelengths not sufficiently present in the first light source. The second optical property attenuates an emitted radiation from the fluorescent material. Other aspects are also described.

US Patent:

20050169581, Aug 4, 2005

Filed:

Jan 30, 2004

Appl. No.:

10/767199

Inventors:

Elizabeth Downing - Sunnyvale CA, US
Juergen Bruegl - Los Altos CA, US

International Classification:

G02B006/26

US Classification:

385039000

Abstract:

An apparatus and method for optically aligning output beams from multiple, individual, different-wavelength laser diodes. The output of a first laser diode is fed directly into the high-reflector of a laser diode, through the gain medium, and is output from an output coupler in each of a sequence of abutting laser diodes. The output from the last laser diode includes the individual beams from each laser diode in the same single optical axis, while retaining the original wavelengths.

US Patent:

20120080877, Apr 5, 2012

Filed:

Dec 15, 2011

Appl. No.:

13/327744

Inventors:

Elizabeth A. Downing - Sunnyvale CA, US

International Classification:

B42D 15/00
C09K 11/02
G02B 5/23

US Classification:

283 67, 252586, 283 85

Abstract:

Methods and systems for optical effects in pigments, inks, and on media. One aspect of this disclosure involves a pigment particle which includes a core, having a fluorescent material and having a spherical shape, and a shell surrounding the core; the shell includes a photochromic material which has a first optical property in a first light source and a second optical property in a second light source which includes a set of wavelengths not sufficiently present in the first light source. The second optical property attenuates an emitted radiation from the fluorescent material. Other aspects are also described.

US Patent:

20120088079, Apr 12, 2012

Filed:

Jun 10, 2011

Appl. No.:

13/157683

Inventors:

Elizabeth A. Downing - Sunnyvale CA, US
Nicholas K. Sheridon - Sunnyvale CA, US

International Classification:

B32B 3/10
C09D 5/00
C09D 11/02

US Classification:

428207, 106 316, 106 3101, 106 3164, 106 3132, 106 3165

Abstract:

There is described an optical-effect-producing medium comprising a carrier medium () containing or comprising pigment particles () having at least one optically responsive pigment or dye () that responds to incident electromagnetic radiation of at least a selected excitation wavelength or wavelength band (λ) by producing an optical response in the visible or near-visible spectrum. A refractive index (n) of the carrier medium () and a refractive index (n; n) of the pigment particles () are selected to maximise the amount of incident electromagnetic radiation reaching the said at least one optically responsive pigment or dye (). Also described is the use of such optical-effect-producing medium to produce an optically responsive feature, especially for security, authentication and/or identification purposes, as well as objects comprising such an optically responsive feature.

US Patent:

20120104278, May 3, 2012

Filed:

Sep 22, 2011

Appl. No.:

13/240885

Inventors:

Elizabeth A. Downing - Sunnyvale CA, US
Mark G. Willner - Lafayette CO, US

International Classification:

G01N 21/64

US Classification:

2504581, 250200

Abstract:

Apparatuses and methods relating to excitation, interrogation, and identification of covert taggants, are described. In one exemplary embodiment, a multi-measurement interrogator comprising an emitter and an optical sensing subsystem that is capable to sense more than one type of a response signal from a taggant is described. The multi-measurement interrogator may interrogate the taggant multiple excitation wavelengths, acquire more than one type of the response signal from the taggant, and perform quantitative measurements of the response signal. Another exemplary embodiment of the invention describes an eye-safe interrogator that includes a light emitting diode (LED), wherein LED is capable to stimulate one or more of an upconversion fluorescence and a Stoke's fluorescence from the taggant. Another exemplary embodiment of the invention provides a portable, hand-held covert interrogator, which utilizes invisible light both to excite the taggant and to receive a response from the taggant.