Inventor

Takamasa Harada

Inventor

Tokyo, JP

Overview

1983–2011

Patent span

Chemistry

Primary field (CPC C)

Patents· 42 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C09Kprimary

C09KMaterials for miscellaneous applications, not provided for elsewhere27%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein22%

G09GArrangements or circuits for control of indicating devices using static means to present variable information6%

C07DHeterocyclic compounds5%

C09DCoating compositions, e.g. paints, varnishes or lacquers5%

Y10TTechnical subjects covered by former us classification5%

C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds4%

G02BOptical elements, systems or apparatus4%

C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients3%

B82YSpecific uses or applications of nanostructures2%

PatentTitleYear

8,034,435'Plastic film with a multilayered interference coating'2011 7,473,721'Nanocomposite material for the production of index of refraction gradient films'2009 7,473,521'Composite mask for producing a diffuser'2009 7,154,672'Optical film having controlled scattering/transmitting characteristics'2006 6,602,604'Coating composition'2003 6,372,403'Photosensitive resin composition'2002 RE037333'Ferroelectric liquid crystal display device having an A.C. holding voltage'2001 5,795,629'Liquid crystal alignment layer and liquid crystal display device'1998 5,744,203'Alignment layer for liquid crystals'1998 5,702,639'Use of complex ligands for ions in ferroelectric liquid-crystal mixtures'1997 5,670,084'Alignment layer material for liquid crystal display devices'1997 5,656,340'Liquid crystal display device'1997 5,594,575'Ferroelectric liquid-crystal systems having three or more chiral additives with different signs of the helical twist in the cholesteric phase'1997 5,430,564'Process for producing ferroelectric liquid-crystal cells with oleophilic additive employing heat and low pressure overlapped a short time'1995 5,408,347'Polyester based liquid-crystal display device'1995 5,407,599'Cyclopropylaklyl or -alkenyl or heterocyclic compounds, process for their preparation and their use in liquid-crystalline mixtures'1995 5,384,168'Ferroelectric liquid-crystal display of high contrast and brightness'1995 5,378,394'Ferroelectric liquid-crystalline mixtures'1995 5,373,380'Ferroelectric liquid crystal display with liquid crystal mixtures having high spontaneous polarization and short helical pitch and alignment layers containing lipophilic or amphiphilic compounds'1994 5,366,657'Geminal dimethylalkyl compounds, process for their preparation and their use in liquid-crystalline mixtures'1994 5,361,152'Process for producing ferroelectric liquid-crystal cells'1994 5,360,576'Chiral alkenylaryl 2,3-epoxyalkyl ethers, and the use thereof in liquid-crystalline mixtures'1994 5,353,136'Ferroelectric liquid crystal with positive dielectric anisotropy, chevron structure and grey scale'1994 5,333,075'Ferroelectric liquid crystal mixtures containing lipohilizing, lipophilic or amphiphilic compounds for eliminating ionic impurities'1994 5,286,409'Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures'1994 5,231,528'Ferroelectric liquid crystal components having high spontaneous polarization and low helical pitch'1993 5,206,751'Process for the production of an impact-resistant liquid crystal switching and display device'1993 5,178,792'Macrocyclic compounds as component for ferroelectric liquid crystal mixtures'1993 5,167,856'Ionophore-containing ferroelectric liquid crystal mixtures'1992 5,118,538'Electrically conductive polymers and their use as orienting layer in liquid-crystal switching and display elements'1992 4,989,955'Liquid crystal electro-optical element and process for preparation thereof'1991 4,980,082'Ferroelectric SmC liquid crystal composition which comprises pyrimidinylphenyl ester compounds'1990 4,939,003'Liquid crystal element'1990 4,793,693'Ferro-electric liquid crystal electro-optical device having a drive voltage with DC and chopping components'1988 4,792,211'Ferroelectric liquid crystal electro-optical device having high water repellent alignment layer'1988 4,762,400'Ferroelectric liquid crystal electro-optical device having half-select voltage to maximize contrast'1988 4,725,688'Liquid crystal compound'1988 4,715,688'Ferroelectric liquid crystal display device having an A.C. holding voltage'1987 4,693,563'Ferro-electric liquid crystal electro-optical device'1987 4,662,721'Ferro-electric liquid crystal electro-optical device'1987 4,633,012'Liquid crystal compound'1986 4,408,201'Electro-optic display device using phase transition mode liquid crystal'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983–1991Patents assigned to SEIKO INSTR & ELECTRONICS (7)· patent assignee history

1983–2006Based in Tokyo, JP· patent location history

1986–1990Patents assigned to TEIKOKU CHEM IND CO LTD (3)· patent assignee history

1987–2001Patents assigned to SEIKO INSTR INC (6)· patent assignee history

1990–1998Based in Inzaimachi, JP· patent location history

1991–1994Based in Inba-gun, JP· patent location history

1992–1998Patents assigned to HOECHST AG (23)· patent assignee history

1992–2009Based in Inzai, JP· patent location history

1994–2011Based in Chiba, JP· patent location history

2006–2011Patents assigned to TOMOEGAWA CO LTD (4)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HOECHST AG	23	1992–1998
SEIKO INSTR & ELECTRONICS	7	1983–1991
SEIKO INSTR INC	6	1987–2001
TOMOEGAWA CO LTD	4	2006–2011
TEIKOKU CHEM IND CO LTD	3	1986–1990

Locations

Location	Patents	Span
Tokyo, JP	13	1983–2006
Inzai, JP	10	1992–2009
Chiba, JP	6	1994–2011
Inzaimachi, JP	6	1990–1998
Inba-gun, JP	2	1991–1994