Inventor

DUEBAL HANS-ROLF

US38 patents

⚠️ This page may combine multiple inventors who share the name “DUEBAL HANS-ROLF”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

DUEBAL HANS-ROLF

HOECHST AG

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

Ferroelectric liquid crystal display having gray steps or a continuous gray scale

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

Electrically conductive polymers and their use as orienting layer in liquid-crystal switching and display elements

Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures

Chiral aryloxypropionates, and the use thereof as dopes in liquid-crystal phases

Liquid-crystal 5-phenylpyrimidine derivatives having sc or sc* phases and a process for preparing them

Use of liquid-crystal 5-phenylpyrimidine derivatives as components of smectic liquid-crystal mixtures

Chiral aryl-2,3-epoxyalkyl-ethers and the corresponding thio compounds thereof, and the use thereof as dopes in liquid-crystal phases

Cyclopropylaklyl or -alkenyl or heterocyclic compounds, process for their preparation and their use in liquid-crystalline mixtures

Ferroelectric liquid crystal with positive dielectric anisotropy, chevron structure and grey scale

Organosilylalkyl or organosilylalkenyl compounds, process for preparing them and their use in liquid-crystalline mixtures

Ferroelectric liquid-crystal display of high contrast and brightness

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

Use of polyaryl ether ketones as alignment layers

Liquid-crystalline phenylpyrimidinyl cyclohexanecarboxylates having a smectic phase, a process for their preparation, and their use in liquid-crystal mixtures

Ferroelectric liquid-crystalline mixtures

Use of fluorinated aromatic polyamides as orientation layer for liquid-crystal switching and display devices

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

Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures

Substituted aromatic polyamides as orientation layers for liquid crystal display elements and liquid crystal switching elements

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

Ferroelectric liquid-crystal systems having three or more chiral additives with different signs of the helical twist in the cholesteric phase

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

Optically active carboxylic esters of oxygen-containing heterocycles as doping substances in liquid crystal mixtures and liquid crystal mixtures containing them

CLARIANT INT LTD

Active matrix displays having high contrast values

Active matrix liquid crystal device and smectic liquid crystal mixture

Disubstituted phenanthrenes and their use in liquid-crystal mixtures

Smectic liquid crystal high-contrast control or display device

AVENTIS RES & TECH GMBH & CO

Monostable ferroelectric active-matrix display

Monostable ferroelectric active matrix display

Ferroelectric liquid-crystal display having active matric elements

Chip card with bistable display

MERCK PATENT GMBH

Liquid crystalline medium

LI JI

Liquid crystal mixture

MERCK PATENT BESCHRAENKTER HAF

Fluorinated (dihydro)phenanthrene derivatives, and their use in liquid-crystalline media

AVENTIS RES & TECHNOLOGY DEUTS

Ferroelectric liquid-crystal display with wide range of working temperatures

CLARIANT GMBH

Ferroelectric active matrix displays with wide operating temperature range