Patents Assigned to Trans World Technology Laboratories, Inc.
-
Patent number: 4224397Abstract: A diazotype material useful for making duplicates of continuous tone originals, such as X-ray films, comprising a transparent film support having a coating of a layer thereon consisting essentially of at least two light-sensitive diazo compounds having different photolysis rates, couplers for the diazo compounds, an ultraviolet radiation absorbing material and homogeneously distributed in the layer at least about 7% by weight, based on the weight of lacquer, of an inert particulate material such as silica. The use of this material makes it possible to approximate a logarithmic photolysis, thereby providing sufficient linearity in the corresponding characteristic curve to achieve the desired duplicating results.Type: GrantFiled: January 26, 1979Date of Patent: September 23, 1980Assignee: Trans World Technology Laboratories Inc. (TWT Labs, Inc.)Inventor: Gilbert Zweig
-
Patent number: 4148646Abstract: A diazotype material useful for making duplicates of continuous tone originals, such as X-ray films, comprising a transparent film support having a coating of a layer thereon consisting essentially of at least two light-sensitive diazo compounds having different photolysis rates, couplers for the diazo compounds, an ultraviolet radiation absorbing material and homogeneously distributed in the layer at least about 7% by weight, based on the weight of lacquer, of an inert particulate material such as silica. The use of this material makes it possible to approximate a logarithmic photolysis, thereby providing sufficient linearity in the corresponding characteristic curve to achieve the desired duplicating results.Type: GrantFiled: June 13, 1977Date of Patent: April 10, 1979Assignee: Trans World Technology Laboratories, Inc.Inventor: Gilbert Zweig
-
Patent number: 4114926Abstract: Premature color formation and fogging in composites used in two sheet thermographic imaging systems are prevented by providing a polymeric barrier coating between the two interactive layers. The barrier coat serves to keep the volatilizable organic acid in the donor sheet from diffusing into the dye precursor receptor sheet during storage or transport, but permits the desired diffusion at thermographic imaging temperatures. Suitable barrier coat layers, which must be acid-resistant, include chlorinated rubber, chlorinated polypropylene, styrene-acrylonitrile copolymer, chlorinated paraffins, polystyrene and vinyl chloride-vinyl acetate copolymer.Type: GrantFiled: April 19, 1976Date of Patent: September 19, 1978Assignee: Trans World Technology Laboratories, Inc.Inventors: David P. Habib, Morgan E. Gager
-
Patent number: 4109937Abstract: An acid donor sheet for use in thermographic imaging which comprises a substrate sheet material having a coating comprising an organic acid which is volatilizable at thermographic imaging temperatures, an additive consisting essentially of a fatty acid having from 10 to 26 carbon atoms or a metal salt thereof, and a polymeric binder compatible with said volatilizable acid. A preferred composition is salicylic acid, lauric acid and nitrocellulose on a polyester base. The acid donor sheet of the invention is particularly useful in providing color projection transparencies having improved image density, readability, and permanence.Type: GrantFiled: January 30, 1976Date of Patent: August 29, 1978Assignee: Trans World Technology Laboratories, Inc. (TWT Labs Inc.)Inventor: Morgan E. Gager
-
Patent number: 4094681Abstract: A method for the amplification or intensification of dye images formed in a negative-working diazo system which comprises the steps of: (1) initially image-wise exposing a negative-working diazo layer to actinic radiation sufficient to convert a portion of the diazo compound contained therein to an active coupling constituent in the light-struck areas to form a first latent image, (2) developing the exposed diazo layer to effect coupling so as to form colored incipient images in the light-struck areas, (3) exposing the entire diazo layer from the same side as the initial image-wise exposure to actinic radiation of a greater amount than that used in the initial exposure, said amount of actinic radiation being sufficient to substantially photolyze the non-image areas while simultaneously creating second latent images beneath the already-developed areas, and (4) developing the exposed diazo layer again to effect coupling in said second latent image areas to form color therein and to amplify the initial colored iType: GrantFiled: October 23, 1975Date of Patent: June 13, 1978Assignee: Trans World Technology Laboratories, Inc.Inventors: David P. Habib, Gilbert Zweig