Kevin S Stewart

US Patent:

7410691, Aug 12, 2008

Filed:

Mar 4, 2004

Appl. No.:

10/793241

Inventors:

William P. Blackburn - Safety Harbor FL, US
Michael B. Levesque - Tampa FL, US
Kevin J. Stewart - Murrysville PA, US
Cathy L. Short - Largo FL, US

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

B32B 17/10
G02C 7/02

US Classification:

428334, 428339, 428412, 4284231, 351159

Abstract:

Describes a photochromic article, e. g. , a plastic ophthalmic photochromic article, such as a lens, in which the article includes (1) a rigid substrate, such as a thermoset or thermoplastic polymeric substrate, (2) a photochromic polymeric coating appended to at least one surface of the substrate, the photochromic polymeric coating containing a photochromic amount of at least one photochromic material, e. g. , spirooxazine, naphthopyran and/or fulgide, and (3) an acrylate-based film coherently appended to the photochromic coating, the acrylate-based film containing an adhesion promoting amount of an adhesion promoter, e. g. , an aminoorganosilane, silane coupling agent, organic titanate coupling agent or organic zirconate coupling agent. Describes also the aforedescribed photochromic article having an abrasion-resistant coating affixed to the acrylate-based film, e. g. , an abrasion-resistant coating comprising an organo silane; and a photochromic article having an antireflective coating affixed to the abrasion-resistant coating.

US Patent:

20180095190, Apr 5, 2018

Filed:

Mar 10, 2016

Appl. No.:

15/556326

Inventors:

- Galway, IE
Joseph D. Turpen - Safety Harbor FL, US
William D. Carpenter - Pinellas Park FL, US
Kevin J. Stewart - Palm Harbor FL, US

International Classification:

G02B 1/10
G02C 7/02
B24B 13/005

Abstract:

The present invention relates to an optical element that includes a mark (). The optical element has a first coating layer () over at least a portion of a surface of an optical substrate () having the mark () on the surface of the optical substrate, and one or more additional coating layers () over at least a portion of the first coating layer (). The first coating layer has a first refractive index, and the optical substrate and the mark may have a second refractive index. A difference between the first refractive index and the second refractive index has an absolute value of 0.02 to 0.24. At least one of the first coating layer () and the one or more additional coating layers () may be applied by a controlled deposition of a coating material in droplet form.

US Patent:

20180056615, Mar 1, 2018

Filed:

Mar 10, 2015

Appl. No.:

15/556633

Inventors:

- Pinellas Park FL, US
Jennine M. Frease - St. Petersburg FL, US
William D. Carpenter - Pinellas Park FL, US
Kevin J. Stewart - Palm Harbor FL, US

International Classification:

B29D 11/00
G02B 5/20
G02C 7/10

Abstract:

A method for preparing an optical element which colors in a non-uniform linear pattern is provided. The method includes (I) providing an optical element which previously has been treated with a photochromic composition containing at least one first photochromic material, the photochromic composition having an absorbance spectrum in the region of photochromic activation; (II) preparing at least one light-absorbing composition containing ultraviolet light absorber, a second photochromic material which is the same or different than the first photochromic material, or mixtures thereof, where the light-absorbing composition has an absorbance spectrum overlapping with that of the photochromic composition in the region of photochromic activation; (III) depositing the light-absorbing composition over the surface of the photochromic optical element in a controlled, predetermined pattern using an inkjet printing apparatus to provide a linearly gradient color pattern upon exposure to actinic radiation; (IV) and drying the composition. An optical element also is provided.

US Patent:

20140232978, Aug 21, 2014

Filed:

Feb 19, 2014

Appl. No.:

14/184151

Inventors:

- Pinellas Park FL, US
Kevin J. Stewart - Palm Harbor FL, US
Anil Kumar - Murrysville PA, US

International Classification:

G02C 9/00
G02C 7/12
G02C 7/10

US Classification:

351 47

Abstract:

The invention provides a multi-layer experiential optical device including at least one polymeric layer having a first side and an opposing second side, and having a light-influencing property; and a low tack pressure sensitive adhesive layer applied on at least a peripheral zone of the second side of the polymeric layer. The experiential optical device is reversibly adherent to an optical lens.