Inventor

Claus Escher

Inventor

Muhltal, DE

Overview

1988–1999

Patent span

Chemistry

Primary field (CPC C)

Patents· 34 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 elsewhere43%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein23%

C07DHeterocyclic compounds22%

C07CAcyclic or carbocyclic compounds4%

C07FAcyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium or tellurium3%

F01KSteam engine plants1%

F02BInternal-combustion piston engines1%

G09GArrangements or circuits for control of indicating devices using static means to present variable information1%

PatentTitleYear

5,859,680'Electrical addressing of ferroelectric liquid-crystal displays'1999 5,702,639'Use of complex ligands for ions in ferroelectric liquid-crystal mixtures'1997 5,679,792'Derivatives of 3-cyclohexylpropionic acid, and the use thereof in ferroelectric liquid-crystal mixtures'1997 5,651,918'Optically active 1,3-dioxolane derivatives carrying a mesogenic radical in the 4-position, a process for their preparation and their use as doping agents in liquid-crystal mixtures'1997 5,641,428'Use of optically active 1,3-dioxolane-4-carboxylates as dopes in liquid-crystal mixtures, liquid-crystal mixtures containing these compounds, and novel optically active 1,3-dioxolane-4-carboxylates'1997 5,630,962'2-Fluoropyridines, their preparation and their use in liquid crystal mixtures'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 5,539,555'High contrast distorted helex effect electro-optic devices and tight ferroelectric pitch ferroelectric liquid crystal compositions useful therein'1996 5,443,754'Pyridylpyrimidines, a process for their preparation and their use in liquid-crystalline mixtures'1995 5,430,564'Process for producing ferroelectric liquid-crystal cells with oleophilic additive employing heat and low pressure overlapped a short time'1995 5,407,599'Cyclopropylaklyl or -alkenyl or heterocyclic compounds, process for their preparation and their use in liquid-crystalline mixtures'1995 5,384,070'Use of optically active tetrahydrofuran-2-carboxylic acid esters as dopants in liquid-crystal mixtures, liquid-crystal mixtures containing same and novel optically active tetrahydrofuran-2-carboxylic acid esters'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 5,360,576'Chiral alkenylaryl 2,3-epoxyalkyl ethers, and the use thereof in liquid-crystalline mixtures'1994 5,361,152'Process for producing ferroelectric liquid-crystal cells'1994 5,354,500'Optically active carboxylic esters of oxygen-containing heterocycles as doping substances in liquid crystal mixtures and liquid crystal mixtures containing them'1994 5,353,136'Ferroelectric liquid crystal with positive dielectric anisotropy, chevron structure and grey scale'1994 5,348,684'Organosilylalkyl or organosilylalkenyl compounds, process for preparing them and their use in liquid-crystalline mixtures'1994 5,333,075'Ferroelectric liquid crystal mixtures containing lipohilizing, lipophilic or amphiphilic compounds for eliminating ionic impurities'1994 5,328,638'Optically active esters of 5-ethyl- and 5-vinyl-1,3-dioxolane-4-carboxylic acid, their use as doping substances in liquid crystal mixtures and the liquid crystal mixtures containing the new esters'1994 5,286,409'Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures'1994 5,257,122'Ferroelectric liquid crystal display having gray steps or a continuous gray scale'1993 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 5,118,538'Electrically conductive polymers and their use as orienting layer in liquid-crystal switching and display elements'1992 5,071,589'Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures'1991 4,988,459'Use of optically active oxirane-2-carboxylic acid esters as dopants in liquid-crystal mixtures, liquid-crystal mixtures containing same and novel optically active oxirane-2-carboxylic acid esters'1991 4,927,244'Use of compounds or mixtures of compounds which have a chiral, orthogonal, more highly ordered smectic phase in the range of said phase as switching or indicating medium'1990 4,911,863'Alkylbyphenyloxyacetic acid esters and their use in smectic liquid crystal materials'1990 4,906,401'Use of liquid-crystal 5-phenylpyrimidine derivatives as components of smectic liquid-crystal mixtures'1990 4,906,752'Liquid-crystal 5-phenylpyrimidine derivatives having sc or sc* phases and a process for preparing them'1990 4,891,151'Liquid-crystalline phenylpyrimidinyl cyclohexanecarboxylates having a smectic phase, a process for their preparation, and their use in liquid-crystal mixtures'1990 4,748,813'Method of operating a thermal engine powered by a chemical reaction'1988

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1988Patents assigned to UNIV LELAND STANFORD JUNIOR (1)· patent assignee history

1988Based in Nieder-Olm, DE· patent location history

1990–1999Patents assigned to HOECHST AG (32)· patent assignee history

1990Patents assigned to SECR DEFENCE BRIT (1)· patent assignee history

1990–1997Based in Muhltal, DE· patent location history

1990Based in Nieder-Remstadt, DE· patent location history

1994–1999Based in Hofheim, DE· patent location history

1996Patents assigned to DISPLAYTECH INC (1)· patent assignee history

1996Based in Muehltal, DE· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HOECHST AG	32	1990–1999
DISPLAYTECH INC	1	1996
SECR DEFENCE BRIT	1	1990
UNIV LELAND STANFORD JUNIOR	1	1988

Locations

Location	Patents	Span
Muhltal, DE	28	1990–1997
Hofheim, DE	3	1994–1999
Muehltal, DE	1	1996
Nieder-Remstadt, DE	1	1990
Nieder-Olm, DE	1	1988