Jonathan P Hannington

US Patent:

8025937, Sep 27, 2011

Filed:

Apr 12, 2007

Appl. No.:

12/296612

Inventors:

Terry Victor Clapp - Hertfordshire, GB
Fumito Nishida - Midland MI, US
Jonathan Paul Hannington - Midland MI, US
Russell Keith King - Midland MI, US
Omar Farooq - Saginaw MI, US
William Alden Crossland - Essex, GB
Joo-Nyung Jang - Yongin, KR
Huan Xu - Cambridge, GB
Anthony Bernard Davey - Cambridge, GB

Assignee:

Dow Corning Corporation - Midland MI
Cambridge Enterprise Ltd. - Cambridge

International Classification:

C09K 19/40
C09K 19/12
C09K 19/20

US Classification:

428 11, 349100, 349172, 25229901, 25229966, 25229967

Abstract:

A liquid crystal electro-optic device. The liquid crystal electro-optic device comprises at least one liquid crystal cell comprising: a pair of substrates having a gap therebetween; a pair of electrodes, the pair of electrodes positioned on one of the substrates or one electrode positioned on each substrate; and a ferroelectric, oligosiloxane liquid crystal material disposed in the gap between the pair of substrates, the ferroelectric, oligosiloxane liquid crystal material exhibiting an I-♦ SmC* phase sequence wherein the liquid crystal electro-optic device is bistable in operation. The invention also involves a method for making a liquid crystal electro-optic device.

US Patent:

8368831, Feb 5, 2013

Filed:

Oct 19, 2007

Appl. No.:

12/738677

Inventors:

Jonathan Paul Hannington - Midland MI, US
Terry Victor Clapp - Bishop's Stortford, GB
Fumito Nishida - Midland MI, US
Russell Keith King - Midland MI, US
Omar Farooq - Saginaw MI, US
Martin Grasmann - Midland MI, US
William Alden Crossland - Harlow, GB
Harry James Coles - Sutton Ely, GB
Anthony Bernard Davey - Cambridge, GB
Huan Xu - Cambridge, GB
Oliver Hadeler - Cambridge, GB
Mykhaylo Pivnenko - Cambridge, GB

Assignee:

Dow Corning Corporation - Midland MI
Cambridge Enterprise Ltd. - Cambridge

International Classification:

G02F 1/136

US Classification:

349 41

Abstract:

A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modified nano-phase segregating liquid crystalline material; and at least one additional material selected from a second oligosiloxane-modified nano-phase segregating liquid crystalline material, non-liquid crystalline oligosiloxane-modified materials, organic liquid crystalline materials, or organic non-liquid crystalline materials, wherein the liquid crystal formulation is nano-phase segregated in the SmC* phase, has an I→SmC* phase transition, with a SmC* temperature range from about 15 C. to about 35 C. , has a tilt angle of about 22. 56 or about 456, and has a spontaneous polarization of less than about 50 nC/cm2, and a rotational viscosity of less than about 600 cP. Devices containing liquid crystal formulations are also described. The device has a stable bookshelf geometry, bistable switching, and isothermal electric field alignment, a response time of less than 500 μs when switched between two stable states, and an electric drive field of less than about 30 V/μm.

US Patent:

20090115957, May 7, 2009

Filed:

Jan 26, 2005

Appl. No.:

10/584791

Inventors:

Harry Coles - Cambridgeshire, GB
Mykhaylo Pivnenko - Cambridge, GB
Jonathan Hannington - Midland MI, US

International Classification:

G02F 1/13
C09K 19/06
C09K 19/34
G02F 1/295
H01S 3/09
C09K 19/12

US Classification:

349167, 25229901, 25229961, 25229966, 372 1, 385 8

Abstract:

A blue phase liquid crystalline material comprising a mixture comprising at least one bimesogenic compound and at least one chiral compound, wherein the material is capable of stable existence in the blue phase over a temperature range of at least 5 C. A process for the preparation of the above blue phase liquid crystalline material, an optical device comprising it, a process of mirrorless lasing and a slotted monolithic optical waveguide using it are also disclosed.

US Patent:

20100283925, Nov 11, 2010

Filed:

Oct 26, 2007

Appl. No.:

12/739445

Inventors:

Jonathan Paul Hannington - Midland MI, US
Terry Victor Clapp - Bishop's Stortford, GB
Fumito Nishida - Midland MI, US
Russell Keith King - Midland MI, US
Omar Farooq - Saginaw MI, US
Martin Grasmann - Midland MI, US
William Alden Crossland - Harlow, GB
Harry James Coles - Sutton Ely, GB
Anthony Bernard Davey - Cambridge, GB
Huan Xu - Cambridge, GB
Oliver Hadeler - Cambridge, GB
Mykhaylo Pivnenko - Cambridge, GB

Assignee:

DOW CORNING CORPORATION - Midland MI
CAMBRIDGE ENTERPRISE LTD. - Cambridge

International Classification:

G02F 1/133
C09K 19/34

US Classification:

349 33, 25229961, 349171

Abstract:

A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modified nano-phase segregating liquid crystalline material; and at least one additional material selected from a second oligosiloxane-modified nano-phase segregating liquid crystalline material, non-liquid crystalline oligosiloxane-modified materials, organic liquid crystalline materials, or non-liquid crystalline materials, wherein the liquid crystal formulation has an I→SmA*→SmC* phase transition, with a SmC* temperature range from about 15 C. to about 35 C., a tilt angle of about 22.56 or about 456, a spontaneous polarization of less than about 50 nC/cm2., and a rotational viscosity of less than about 600 cP. Devices containing liquid crystal formulations are also described. The device has a stable bookshelf geometry, bistable switching, and isothermal electric field alignment, a response time of less than 500 μs when switched between two stable states, and an electric drive field of less than about 30 V/μm.

US Patent:

20130155340, Jun 20, 2013

Filed:

Mar 15, 2011

Appl. No.:

13/635334

Inventors:

Terry Victor Clapp - Bishop's Stortford, GB
William Alden Crossland - Harlow, GB
Anthony Bernard Davey - Cambridge, GB
Martin Grasmann - Midland MI, US
Jonathan Paul Hannington - Midland MI, US
Russell Keith King - Midland MI, US
Mikhael Pivnenko - Cambridge, GB
Steven Robson - Cowbridge, GB
Huan Xu - Cambridge, GB

International Classification:

C09K 19/60
C09K 19/58
G02F 1/137

US Classification:

349 41, 349184, 2522992, 2522991

Abstract:

The present, invention relates to liquid crystal compositions having a smectic A structure for use in an optical device in which the composition is sandwiched between a pair of electrodes (-). In essence the composition includes a siloxane oligomer (component (a)) which may be seen to construct a layered SmA system of particular spacing and “strength”. Within this structure a low molar mass nematic mesogen (component (c)) is provided that may be considered to be that of a “plasticiser” which moderates the layer “strength”, while simultaneously providing tuneability to the properties of the composition, e.g. its refractive index or dielectric anisotropy. The addition of a side chain liquid crystal polysiloxane (component (d)) allows such systems to be further moderated since they can be considered as binding together the la>rs, both within a given layer and between layers. An ionic dopant (component (b)) is also included in the composition that migrates through the composition when low frequency electric fields are applied to the composition by the electrodes, thereby disrupting the order to the composition. Order in the composition can be restored by applying a higher frequency field that does not allow the dopant time to migrate significantly. Chromophores may also be included in the formulation.

US Patent:

20160244625, Aug 25, 2016

Filed:

Oct 22, 2014

Appl. No.:

15/027076

Inventors:

- Midland MI, US
Jonathan Hannington - Midland MI, US
Bianxiao Zhong - Midland MI, US

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

C09D 11/101
B41J 11/00
C09D 11/30

Abstract:

Various embodiments disclosed related to UV-curable silicone composition, cured products thereof, and methods of using the same. Various embodiments provide a shear-thinning UV-curable silicone composition. The composition can include (A) a mercapto-functional polyorganosiloxane having the unit formula [(CH)SiO][(CH)SiO][R(CH)SiO]wherein x is about 0.01 to about 0.1, y is about 0 to about 0.94, z is about 0.05 to about 0.99, and at each occurrence R is independently a mercapto(C)hydrocarbyl group. The composition can include (B) at least one of (B1) a polyorganosiloxane comprising at least two aliphatic unsaturated carbon-carbon bonds, and (B2) an organic molecule comprising at least two aliphatic unsaturated carbon-carbon bonds; the composition can include (C) a filler. The composition can also include (D) a photoinitiator.

US Patent:

20150049267, Feb 19, 2015

Filed:

Sep 6, 2012

Appl. No.:

14/344680

Inventors:

- Cambridge, GB
- Midland MI, US
John Richard Moore - Cambridge, GB
Daping Chu - Cambridge, GB
Jonathan Paul Hannington - Midland MI, US
Terry Clapp - Hertford, GB

International Classification:

G02F 1/137
G02F 1/1337
G02F 1/133

US Classification:

349 24, 349184

Abstract:

In a method of operating a liquid crystal device having a liquid crystal composition with smectic-A properties, a first waveform is applied to optically clear the device so that it is substantially transparent to visible light and a second waveform is applied to disorder the material of the liquid crystal composition to afford a strongly light-scattering state. The first waveform has a higher frequency than the second, waveform, and the method comprises applying a modified waveform to partially clear at least a portion of the device from the light-scattering state