KENNETH MARSHALL
Physical Therapy at Lilac Dr, Rochester, NY

7042617, May 9, 2006

Apr 2, 2003

10/405163

Tanya Z. Kosc - Rochester NY, US
Kenneth L. Marshall - Rochester NY, US
Stephen D. Jacobs - Pittsford NY, US

The University of Rochester - Rochester NY

G02F 1/13

359272, 354273, 349 16

Optical devices utilizing flakes (also called platelets) suspended in a host fluid have optical characteristics, such as reflective properties, which are angular dependent in response to an AC field. The reflectivity may be Bragg-like, and the characteristics are obtained through the use of flakes of liquid crystal material, such as polymer liquid crystal (PLC) materials including polymer cholesteric liquid crystal (PCLC) and polymer nematic liquid crystal (PNLC) material or birefringent polymers (BP). The host fluid may be propylene carbonate, poly(ethylene glycol) or other fluids or fluid mixtures having fluid conductivity to support conductivity in the flake/host system. AC field dependent rotation of 90° can be obtained at rates and field intensities dependent upon the frequency and magnitude of the AC field. The devices are useful in providing displays, polarizers, filters, spatial light modulators and wherever switchable polarizing, reflecting, and transmission properties are desired.

8435333, May 7, 2013

Aug 1, 2011

13/195508

Kenneth L. Marshall - Rochester NY, US
Eric Glowacki - Marlboro NJ, US

University of Rochester - Rochester NY

B01D 53/22, C09K 19/30, C09K 19/20, C09K 19/12, C09K 19/44, C09K 19/60, C09K 19/38

96 14, 2522991, 2522995, 25229963, 25229966, 25229967, 25229968

Switchable gas permeation membranes in which a photo-switchable low-molecular-weight liquid crystalline (LC) material acts as the active element, and a method of making such membranes. Different LC eutectic mixtures were doped with mesogenic azo dyes and infused into track-etched porous membranes with regular cylindrical pores. Photo-induced isothermal phase changes in the imbibed mesogenic material afforded large, reversible changes in the permeability of the photo-switchable membrane to nitrogen. For example, membranes imbibed with a photo-switchable cyanobiphenyl LC material demonstrated low permeability in the nematic state, while the photo-generated isotropic state demonstrated a 16×-greater sorption coefficient. Both states obey a high linear sorption behavior in accordance with Henry's Law. In contrast, membranes imbibed with a photo-switchable phenyl benzoate LC material showed the opposite permeability behavior to the biphenyl-imbibed membrane, along with nonlinear sorption behavior.

7492439, Feb 17, 2009

Sep 21, 2004

10/945753

Kenneth L. Marshall - Rochester NY, US

The University of Rochester - Rochester NY

G02F 1/13

349201

Liquid crystal point diffraction interferometer (LCPDI) systems that can provide real-time, phase-shifting interferograms that are useful in the characterization of static optical properties (wavefront aberrations, lensing, or wedge) in optical elements or dynamic, time-resolved events (temperature fluctuations and gradients, motion) in physical systems use improved LCPDI cells that employ a “structured” substrate or substrates in which the structural features are produced by thin film deposition or photo resist processing to provide a diffractive element that is an integral part of the cell substrate(s). The LC material used in the device may be doped with a “contrast-compensated” mixture of positive and negative dichroic dyes.

8293135, Oct 23, 2012

Jul 21, 2010

12/840474

Gerald P. Cox - Brockport NY, US
Cathy A. Fromen - Raleigh NC, US
Kenneth L. Marshall - Rochester NY, US
Stephen D. Jacobs - Pittsford NY, US

University of Rochester - Rochester NY

C09K 19/02, C09K 19/54, G02F 1/133, G02F 1/1334

2522995, 349 36, 349 86, 349115, 349116, 349183, 349185, 359296, 359321

A PCLC flake/fluid host suspension that enables dual-frequency, reverse drive reorientation and relaxation of the PCLC flakes is composed of a fluid host that is a mixture of: 94 to 99. 5 wt % of a non-aqueous fluid medium having a dielectric constant value ∈, where 110Siemens per meter (S/m), and a resistivity r, where 10>r>10ohm-meters (Ω-m), and which is optically transparent in a selected wavelength range Δλ; 0. 0025 to 0. 25 wt % of an inorganic chloride salt; 0. 0475 to 4. 75 wt % water; and 0. 25 to 2 wt % of an anionic surfactant; and 1 to 5 wt % of PCLC flakes suspended in the fluid host mixture. Various encapsulation forms and methods are disclosed including a Basic test cell, a Microwell, a Microcube, Direct encapsulation (I), Direct encapsulation (II), and Coacervation encapsulation. Applications to display devices are disclosed.

7238316, Jul 3, 2007

Mar 7, 2003

10/383603

Stephen D. Jacobs - Pittsford NY, US
Tanya Z. Kosc - Rochester NY, US
Kenneth L. Marshall - Rochester NY, US

University of Rochester - Rochester NY

B28B 7/32

264482, 264105, 2642978, 264219, 264313

Precisely configured, especially of geometric shape, flakes of liquid crystal material are made using a mechanically flexible polymer mold with wells having shapes which are precisely configured by making the mold with a photolithographically manufactured or laser printed master. The polymer liquid crystal is poured into the wells in the flexible mold. When the liquid crystal material has solidified, the flexible mold is bent and the flakes are released and collected for use in making an electrooptical cell utilizing the liquid crystal flakes as the active element therein.