Rca Inc.

Allen Bloom

Robert Alfred Bartolini

Ling K Hung

William J Burke

Alan E Bell

Daniel Louis Ross

Richard Jean Williams

Richard Seely Crandall

Howard Sorkin

Herbert A Weakliem

Sidney S Seffren

Alfred Bartolini

A reversible optical recording medium is comprised of an electrically conductive layer overlain by a thermoplastic layer containing a light absorptive compound selected from the group consisting of metal complexes of substituted ethylene dithiols having the structure ##STR1## where M is Pt, Pd, or Ni and R and R' are independently alkyl, phenyl or substituted phenyl groups. Information is recorded by sequentially charging the recording medium and then heating it above its softening temperature by absorption of the recording light beam in the thermoplastic layer.

Reversible optical storage medium and a method for recording information

An optical recording medium comprises a light reflecting material which is coated with a light absorbing layer and overcoated with a 0.05-1 millimeter thick layer of an optically transparent and chemically and thermally stable material such as a silicone resin. During recording, portions of the light absorbing layer are ablated or melted by a modulated focussed light beam, thereby exposing portions of the reflecting layer while leaving the overcoat layer intact. Information is recorded in the form of a reflective-antireflective pattern. Dust particles and other surface contaminants settle on the upper surface of the overcoat layer, so far removed from the focal plane of the recording lens that their effect on the recording or playback signal is considerably reduced, and no defect is noticeable on the playback monitor.

Thick protective overcoat layer for optical video disc

An ablative optical recording medium comprises a substrate coated with a light reflecting coating of passivated aluminum which in turn is coated with a light absorbing ablative layer. During recording, portions of the light absorbing layer are ablated, or vaporized, by a modulated focussed light beam, thereby exposing portions of the reflective layer. Information is recorded in the form of a reflective-antireflective pattern.

Method of recording an ablative optical recording medium

An optical recording medium comprises a light reflecting material which is coated with a light absorbing layer and overcoated with a thin, amorphous, coherent layer of an optically transparent and chemically and thermally stable material such as silicon dioxide. During recording, portions of the light absorbing layer are ablated by a modulated focussed light beam, thereby exposing portions of the reflecting layer while leaving the overcoat layer intact. Information is recorded in the form of a reflective-antireflective pattern. Dust particles and other surface contaminants can be wiped or washed off the recording medium without damage to the light absorbing layer.

Thin protective overcoat layer for optical video disc

Improved aqueous photoresist compositions comprising a water-soluble polymeric material and a photosensitive cross-linking agent, therefore, having the formula: ##STR1## wherein, A and B are independently amino or nitro and M is an alkali metal or ammonium ion, and process of exposing and developing same.

Water-based photoresists using stilbene compounds as crosslinking agents

An ablative recording medium comprises a substrate coated with a light reflecting layer which in turn is coated with a light absorptive layer of di-indeno[1,2,3-cd:1',2',3'-lm]perylene. During recording, portions of the light absorptive layer are ablated by a modulated focussed light beam, thereby exposing portions of the reflecting layer. Video information is recorded as a reflective-antireflective pattern.

Ablative optical recording medium

An ablative recording medium comprises a substrate coated with a light reflecting coating which in turn is coated with a light absorptive layer selected from the group consisting of lead phthalocyanine, chloroaluminum phthalocyanine, vanadyl phthalocyanine, stannic phthalocyanine and chloroaluminum chlorophthalocyanine. During recording, portions of the dye layer are ablated or vaporized by an intensity modulated focussed light beam, thereby exposing portions of the reflective layer and recording video information as a reflective-antireflective pattern.

A recording medium comprises a substrate coated with a light reflecting layer which in turn is coated with a light absorbing layer selected from the group consisting of Pt complexes of bis-(dithio-.alpha.-diketones) which have the formula: ##STR1## wherein R is a phenyl or substituted phenyl group. During recording, portions of the absorbing layer are ablated, vaporized or melted by an intensity-modulated, focussed light beam, thereby exposing portions of the reflective layer and recording video information as a reflective-antireflective pattern.

Optical recording medium

An ablative recording medium comprises a substrate coated with a light reflecting layer which in turn is coated with a light absorptive layer of 6,6'-diethoxythioindigo. During recording, portions of the light absorptive layer are ablated by a modulated focussed light beam, thereby exposing portions of the reflecting layer. Video information is recorded as a reflective-antireflective pattern.

Ablatable medium for optical recording

Novel liquid crystal dyestuffs of the formula ##STR1## wherein Y and Z are different and can be nitro or cyano and --N(R).sub.2 wherein R is alkyl or alkylene, preferably of 1 to 4 carbon atoms, and X can be hydrogen, methyl, fluoro or chloro, can be added to known liquid crystal compositions to impart color to the mixtures and improve contrast in a liquid crystal electro-optic device containing such mixtures.

Novel liquid crystal dyestuffs and electro-optic devices incorporating

A process for storing energy from solar radiation whereby solar radiation is converted into electrical current which is supplied to an electrochemical cell in combination with water and carbon dioxide gas to produce formic acid as an electrochemical storage medium. The formic acid can be easily decomposed by catalysts known in the art into carbon dioxide and hydrogen gas which can be burned as fuel or used as a starting material in numerous commercial applications.

Process for storing solar energy in the form of an electrochemically

Novel dyes of the formula ##STR1## wherein X is --NH, --NCH.sub.3, --S or --O; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently at each occurrence can be hydrogen, fluoro, chloro, bromo, alkoxy, cyano, nitro, --N(R).sub.2 wherein R is alkyl or two of R.sub.1 to R.sub.4 together can be part of an aromatic ring; R.sub.5 and R.sub.6 are hydrogen, fluoro, chloro, bromo or lower alkyl; and R.sub.7 is hydrogen, fluoro, chloro, bromo, alkoxy, cyano, nitro, --N(R.sub.2), ##STR2## HYDROGEN, FLUORO, CHLORO, BROMO, ALKOXY, CYANO, NITRO, DI-ALKYLAMINO, ##STR3## can be added to known liquid crystal compositions to impart color to the mixtures and to improve contrast of a liquid crystal electro-optic device containing such mixtures.

Liquid crystal dyestuffs and electro-optic devices incorporating same

Novel dyes of the formula ##STR1## wherein X can be hydrogen, alkyl, alkoxy, cyano, nitro, dialkylamino, halogen or --N.dbd.N--Y and Y can be phenyl, phenyl substituted in the para position with an alkyl, alkoxy, cyano, nitro, dialkylamino or halogen group, or a heterocyclic ring, can be added to known liquid crystal compositions to impart color to the mixtures and improved contrast to a liquid crystal electro-optic device containing such mixtures.

Electro-optic device

Novel liquid crystal dyes of the formula ##STR1## wherein (CHOL--) is a cholesteryl radical, X can be 0 or NH, R.sub.1 can be H, --OH, methyl, fluoro or chloro; R.sub.2 can be --NO.sub.2, --CN, N-(alkyl).sub.2, --OCOOR, --OCOR, alkyl or alkoxy and R.sub.3 can be H, methyl, fluoro or chloro, can be added to known liquid crystal compositions to impart color to the mixtures and improved contrast to a liquid crystal electro-optic device containing such mixtures.

Cholesteryl carbonates and carbamates of azo dyes

Compounds of the formula ##STR1## wherein Y and Z are different and one is nitro or cyano and the other is --N(R).sub.2 wherein R is alkyl or alkylene, preferably of 1 to 4 carbon atoms, and X can be hydrogen, methyl, fluoro or chloro, are dyes having liquid crystal properties.

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East Windsor, NJ, United States of America

Allen Bloom