Bbc Brown, Boveri & Company, Limited

Klaus Muller

Allan R Kmetz

Terry J Scheffer

Ruzica Loitzl

Andreas Zimmermann

Ron Hutchings

A catalytic powder for coating an anode consisting essentially of 2-45 mol % of RuO.sub.2, 2-45 mol % of IrO.sub.2 and 10-96 mol % of SnO.sub.2. The powder has a rutile crystal type, at least partially as a mixed oxide and has uniform lattice parameters which lie between the values of RuO.sub.2 and IrO.sub.2 and the value of SnO.sub.2. This catalytic powder is prepared by treating H.sub.2 IrCl.sub.6.m H.sub.2 O, RuCl.sub.3.n H.sub.2 O and SnCl.sub.2, wherein m is between 4.1 and 5.5 and n is between 2.5 and 3.85, with an alcohol. The resulting solution is then evaporated. The powder obtained is dried and ignited for 1/2 to 6 hours between 400.degree.-500.degree. C. and then cooled.

Catalyst for coating anodes and a process for its preparation

An electrophoretic display including a cell having two plates spaced apart and provided at least regionally with electrodes, where at least one plate and an associated electrode facing the observer are transparent. The cell contains a suspension consisting of an inert dielectric liquid phase and a dispersed solid phase which at least in part are optically discriminable electrophoretic particles. The individual electrophoretic particles each are of practically the same density as the liquid phase, and at least part of the electrophoretic particles are pigment particles provided with a coating of organic material which is solid at the cell operating temperature but which melts at higher temperatures. The coating material contains at least one charge control agent. The charge control agent, preferably a salt of a divalent metal or metal of higher valency and of an organic acid, imparts a well-defined, uniform surface charge and a well defined, uniform surface potential to the particles.

Electrophoretic display

An electro-optical display for the display of dark symbols against a bright background, wherein except for fine separation lines the front and rear cell plates are almost entirely covered with isolated electrode elements. The regions of overlap between these various front and rear electrode elements define the areas of the selectable display segments. The display employs an electro-optic media requiring no polarizers, for example, cholesteric liquid crystals to which has been added pleochroic dyes, or electrophoretic suspensions. The display device is addressed through the application of appropriate signals to the electrodes so that a vanishingly small potential difference lies across the liquid crystal layer in the region of the selected display segments which remain dark. In all the other regions of the display, however, there exists a potential difference which is larger than the transition voltage of the electro-optical medium, and these regions therefore appear as a bright background. The addressing is preferably carried out using unipolar pulsed signals which are applied to the electrode elements of the front and rear cell plates, with those electrodes corresponding to optically selected display segments receiving signals having the same phase and amplitude.

Electro-optical device for the display of dark symbols composed of

An electrolysis process in which the source of the voltage difference between the anode and the cathode of the electrolysis cell is an electromotive force. The electromotive force is produced in the electrodes by introducing a magnetic field into the electrolysis cell while mounting the electrodes on a conducting element. Movement of the conducting element or magnet, or alternating the magnetic field then creates the necessary electromotive force. Movement of the conducting element may be caused by the flow of electrolyte. Several conducting elements may be contained in each cell.

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Baden, Switzerland

Klaus Muller