E.i. Dupont De Nemours and Company

Other

Greyhawk Systems, Inc.

Evan D Laganis

William Brown Farnham

Sheau-Hwa Ma

Walter R Hertler

Gregory Charles Weed

John Alan Lawton

Dotsevi Y Sogah

William K Smothers

Patrick H Fitzgerald

Ira B Dicker

Frederic J Kahn

Thomas W Del Pesco

Jerry Leff

Bertrand L Chenard

Reid E Kellogg

Alden D West

James L Hohman, Jr

Howard Simmons, Iii

Richard Albert

George Lalka

Apparatus and methods for modulating light involving the formation of bubbles in a normally opaque dye solution contained within a cell. The bubbles are created in the dye solution by focusing a beam from a laser in regions of the dye solution thereby vaporizing a solvent in the solution. When the bubble is formed, the modulator becomes substantially transparent in the region of the bubble. If the focused laser beam is turned off, the bubble condenses and the modulator again becomes opaque in the region of the condensed bubble.

Liquid/vapor optical modulator

Photopolymerizable compositions which comprise a borate anion, a squarylium sensitizer, and, in the preferred case, a halomethyl triazine are disclosed.

Red sensitive photopolymerizable compositions

An apparatus for a liquid crystal image projection system having a liquid crystal cell, including optical apparatus for inducing a uniform texture of scattering centers in a liquid crystal cell by impinging a pulse of optical energy on the liquid crystal cell, thereby the optical energy is absorbed and converted to thermal energy heating the liquid cyrstal to a second temperture, the end of the pulse bringing about a cooling which causes the liquid crystal centers within the liquid crystal cells to scatter in a uniform texture.

Biphenyl derivatives for photostabilization in pulsed optical darkening

These is disclosed donor elements for laser-induced thermal imaging processes containing infra-red absorbing squarylium dyes of the following structure: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each independently alkyl groups of from one to eight carbon atoms.

Donor element for thermal imaging containing infra-red absorbing

A photographic element useful as a laser medical recording film, for example, is described. This element has near infrared sensitivity and is characterized by having an absorbing layer with an absorbing dye as described herein present as an antihalation backing layer.

Infrared laser recording film

One-step process for preparing anhydrous, organic acid alkali or alkaline earth metal salts by contacting and reacting an organic or polymeric acid fluoride, anhydride or ester and an organic alkali or alkaline earth metal silanolate.

Preparation of anhydrous organic acid salts

This invention resides in a polymerization process which is catalyzed by an oxyanion which can form a conjugate acid having a pKa (DMSO) of about 5 to about 24.

Oxyanion-catalyzed polymerization

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Wilmington, DE, United States of America

Evan D Laganis