Rca Inc.

Daniel Louis Ross

Lucian Anthony Barton

Allen Bloom

Richard Joseph Himics

Dragan Milan Gavrilovic

Scott Oliver Graham

Robert Alfred Bartolini

William J Burke

Ling K Hung

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

Ortho-quinone diazide compounds of the formula ##STR1## wherein R is an organic radical are useful sensitizers for photoresist compositions and intermediates for novel dyes.

Novel ortho-quinone diazide photoresist sensitizers

Organic holographic recording media comprise organic photosensitive compounds such as .alpha.-diketones, quinones and nitro compounds in sucrose benzoate as host.

Organic volume phase holographic recording media using sucrose benzoate

Recording media comprising a mixture of 4,4'-bis(3-diazo-3,4-dihydro-4-oxo-1-naphthalenesulfonyloxy)benzil and an alkali soluble resin are suitable for recording information with electron beams. These recording media have high sensitivity, high resolving power and can be reproducibly formulated.

Electron beam recording media containing

Copolymers of certain keto-olefins and SO.sub.2 are sensitive to light and form films useful as photoresists in the manufacture of printed circuits, integrated circuits, printing plates and the like.

Photosensitive copolymer on silicon support

Electrically resistive organic materials, e.g. silicone rubber, thermoplastic resins, and liquid crystals, are made more electrically conductive by the addition of an effective amount of a compound of the formula: ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen, alkyl, and phenyl-substituted alkyl; R.sub.2 is alkyl with 8 - 20 carbon atoms; and Z is selected from the group consisting of phenyl and alkyl-substituted phenyl. The invention is particularly applicable to silicone rubber light valves and liquid crystals.

Method for increasing the conductivity of electrically resistive organic

Liquid crystal compounds of the formula ##STR1## wherein X can be alkyl (R-), alkoxy (RO-), acyloxy ##STR2## or alkylcarbonato ##STR3## wherein R is an alkyl group from 1-10 carbon atoms, and R.sub.1 -R.sub.3 can be hydrogen, methyl or halogen with the proviso that at least one and no more than two of R.sub.1 -R.sub.3 are substituents other than hydrogen, have positive dielectric anisotropy and are useful in electro-optic devices which comprise a thin liquid crystal layer between two closely spaced parallel electrodes.

Novel liquid crystal compounds and electro-optic devices incorporating

Liquid crystal compounds of the formula ##STR1## wherein X can be an alkoxy (RO-), an acyloxy ##STR2## or an alkylcarbonato ##STR3## group wherein R is an alkyl group having up to 10 carbon atoms and Y is a nitro or cyano group, having positive dielectric anisotropy and are useful in electro-optic devices which comprise a thin liquid crystal layer between two closely spaced parallel electrodes.

A method of purifying crude 2,4-bis(6-diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonyloxy)benzophenone by dissolving in an organic solvent, reprecipitating by adding certain nonsolvents and recrystallizing the reprecipitated product from certain solvents.

Method of purifying

Method of recording information in which the electron beam sensitive

Method of preparing a pattern on a silicon wafer

Certain light sensitive .alpha.-diketones dissolved in a cured light-insensitive transparent polymer host form recording media useful for recording volume phase holograms.

Organic volume phase holographic recording media comprising an .alpha.

Recording media comprising a mixture of 2,4-bis(6-diazo-5,6-dihydro-5-oxo-1-napthalenesulfonyloxy)-benzophenone and an alkaki soluble resin are suitable for recording information with electron beams. These recording media have high sensitivity, high resolving power and can be reproducibly formulated.

Growing community of inventors

Princeton, NJ, United States of America

Daniel Louis Ross