Abstract: Phenylurethane compounds formed by the reaction between a phenolic coupler compound and an organic isocyanate compound are utilized to form phenolic coupler compounds in situ in order to react with chromogenic compounds present in the sensitive layer of recording or reproducing materials.The phenolic coupler compounds can also be stabilized by blocking the phenolic hydroxyl with carbonate, an alkyl ether, organosilylated ether or organophosphoric acid ester, some of which are novel compounds. These stabilized derivatives of the stabilized phenolic coupler compound will decompose by application to sufficient thermal energy or suitable liquid or gaseous fluid to form the phenolic coupler compound in situ. The phenolic coupler compound is formed in situ by applying thermal energy to the sensitive layer or by applying to the sensitive layer a liquid or gaseous fluid which is able to decompose the stabilized phenolic coupler compound and release the phenolic coupler compound.

Abstract: A writing liquid is formed from a solvent for an organic styrene resin pigment in combination with a chlorofluoroalkane of from 1 to 3 carbon atoms. The potential toxicity of the solvent (or solvent vapors) is eliminated and writing speeds of the writing liquid are improved by the addition of the chlorofluoroalkane. The writing liquid is used for transparentizing an opaque layer of an organic styrene resin pigment, uniformly distributed as fine particles in a film-forming binder carried on a transparent or opaque support. When the writing liquid is applied to the opaque layer using a suitable writing instrument, such as a pen, the opaque layer immediately becomes transparent where it is contacted with the solvent.

Abstract: A cellulose packaging film for packaging soft cheeses has a controlled permeability to oxygen, carbon dioxide, ammonia and water vapor which allows the cheese to properly ripen while wrapped in the packaging material. The cellulose packaging film is formed from a cellulose film substrate with a coating layer of a nitrocellulose varnish having distributed therein casein or starch particles which have a diameter which is greater than the thickness of the coating layer. In use, the soft cheese is wrapped with the cellulose packaging film with the nitrocellulose varnish layer facing the soft cheese.

Abstract: Transparencies for overhead projection are formed in which the information to be displayed is in the form of transparent lines, or other geometric patterns, on an opaque background. The transparent lines are formed on an opaque layer of a recording material formed from a clear or colored transparency on which the opaque layer is firmly adhered. The opaque layer is formed from finely divided organic styrene resin pigment uniformly distributed in a film-forming binder resin. The writing liquid is formed from a solvent for the organic styrene resin pigment. When the writing liquid is applied to the opaque layer using a suitable writing instrument, such as a pen, the opaque layer immediately becomes transparent where it is contacted with the solvent. The potential toxicity of the solvent (or solvent vapors) is eliminated and writing speeds may be increased by mixing a chlorofluoroalkane of from 1 to 3 carbon atoms with the solvent.

Abstract: Films having widths of up to one meter or more can be coated at high coating speeds of up to 400 meters per minute or more with coating compositions having viscosities reaching up to 400 centipoises or more by arranging first and second guide rollers, a coating roller and rotating smoothing rod such that the path of travel of the film during the coating procedure is a substantially circular path whose diameter is preferably about one meter. During the coating procedure, the tension of the film by the first and second guide rollers is regulated independently of the speed at which the film travels. The apparatus and process have applicability to a wide range of films and coating compositions.

Abstract: A photochromic spiropyran compound is uniformly dispersed in a vinyl chloride homopolymer or copolymer resin binder. The resulting photosensitive composition provides an image which is highly stable against exposure to light, darkness, and heat when the composition is exposed to a light source emitting radiation of wavelength which includes the absorption band of the spiropyran compound.

Abstract: A photochromic spiropyran compound is uniformly dispersed in a vinyl chloride homopolymer or copolymer resin binder. The resulting photosensitive composition provides an image which is highly stable against exposure to light, darkness, and heat when the composition is exposed to a light source emitting radiation of wavelength which includes the absorption band of the spiropyran compound.

Abstract: A photochromic spiropyran compound is uniformly dispersed in a vinyl chloride homopolymer or copolymer resin binder. The resulting photosensitive composition provides an image which is highly stable against exposure to light, darkness, and heat when the composition is exposed to a light source emitting radiation of wavelength which includes the absorption band of the spiropyran compound.

Abstract: A dry development device for reproduction machines, wherein the device includes a rotating magnetic brush for distributing development powder on an image support. The image support is advanced on a planar surface which has an opening therein positioned beneath the magnetic brush. The opening has a plurality of wires stretched thereacross, which hold the image support against the brush, while allowing any development powder which might otherwise adhere to the back of the image support to fall into the opening. The wires are arranged in two groups of parallel, uniformly spaced wires with the wire groups converging and positioned symmetrically in a herringbone pattern. A scraper edge of the toner reservoir is presented against the magnetic brush at an angle substantially perpendicular to the surface of the brush.

Abstract: A system for electrostatic reproduction in which a carrier surface is charged with an image, the image-charged surface is presented adjacent a receiving surface, and a liquid or powder developer is selectively charged and is presented between the image-charged surface and the receiving surface to produce a developed image on the receiving surface.

Abstract: The photochromic activity of triphenylmethane paraamino leuco salts is reversibly inactivated in compositions containing the leuco salt with certain metallic oxides or sulfides. The photochromic properties of the leuco salts are restored by the application of energy, e.g. heat, mechanical pressure, etc. The sensitive compositions containing the leuco salt and metal oxide or sulfide are useful in a process for recording information according to a predetermined pattern by applying a local heat source or local pressure source to a recording material containing a layer of the sensitive composition, the application of energy resulting in the formation of colored marks corresponding to the information to be recorded.

Abstract: Feed mechanism for delivering copy sheets in photocopy machines which comprises a frame, a hopper mounted on said frame and provided on its front edge portion with pin means against which is applied the pile of sheets being fed, mobile plate means for holding said sheets, said mobile means being articulated around a crosswise axis placed plumb to its center of gravity, a counterweight means on said mobile plate means located on the side opposite said pin means, and drive means for disengaging the sheets of paper one by one.

Abstract: A method and an apparatus for the development of electrophotographic or electrosensitive paper comprising a tank having a curved bottom and capable of holding a liquid developer at a constant level; metallic roller means situated in the tank so that the level of developer in the tank is located at a zone wherein the distance between the metallic roller means and the tank wall is the least and does not exceed 5/10mm, a first pair of rollers for feeding said paper into the tank and a second pair of roller means for wiping the papers as they leave the developer and carries them to a receiving point and means for inducing to the metallic roller an electrical potential while grounding tank.

Abstract: A monoaxially or biaxially drawn composite polyester film comprising at least two layers of polyesters having different physical properties. At least one polyester layer is produced utilizing a catalytic system wherein the catalyst residue is insoluble in the polymer and at least one other polyester layer is produced using a catalyst system wherein the catalytic residue is soluble or only slightly insoluble in the polyester. A process for producing such composite polyester film comprises coextruding at least two polyester polymers into a layered film, one of these polyester layers containing crystallization sites in the form of the residue of the interchange catalyst used to form the polyester, and at least one polyester layer comprising a polyester wherein the interchange catalyst system is soluble or only slightly insoluble in the polyester; and drawing the layered film either monoaxially or biaxially.

Abstract: A device and a process for the liquid development of electrostatic latent images on a sheet surface which comprises: moving sheet material having said electrostatic latent images pass a reservoir containing developing liquid and having an open upper part and a lower part with openings through which the developing liquid passes, applying said sheet by capillary action against said lower part openings, whereby the amount of developing liquid is applied as needed.

Abstract: An improved electrophotographic process, where the image to be reproduced is transferred onto a photoconductive support as an image of electric charges, in which image of charges is transferred from a photoconductive support in virtual contact with a dielectric support to the dielectric support, the improvement comprising completely discharging the photoconductive support before or at the instant of separation of the dielectric support and photoconductive support. The electrophotographic reproduction apparatus of the present application comprises means for producing an electrostatic image on a dielectric support means to bring said dielectric support into virtual face-to-face contact with a photoconductive support, means to transfer the electrostatic image to the dielectric support from the photoconductive support, and means to completely discharge the photoconductive support subsequent to the transfer of charges but before the separation of the dielectric support and photoconductive support.

Abstract: Method and apparatus for electrostatic reproduction of originals by transfer of a latent charge image from an intermediate surface to an uncharged insulating surface by moving the intermediate and insulating surfaces to a virtual contact point and producing an external electric field between a pair of electrodes at the virtual contact point to ionize the space between the intermediate and insulating surfaces to transfer the charge image progressively therebetween on a line-by-line basis, instantaneously.

Abstract: Photosensitive compositions which include a homogeneous mixture ofA. at least one diazonium salt which is photodecomposable into phenol;B. at least one spiropyran compound which is photodecomposable into mercocyanine; and optionallyC. a material which is normally solid at ambient temperatures and has a melting point no higher than about 150.degree.C and which when in the molten state is a solvent for the phenol and merocyanine compounds from (a) and (b), above.The merocyanine and phenol form colored complexes when reacted in the molten or dissolved state.The photosensitive compositions of the present invention can be used for preparing reproductions of original transparencies containing image areas and non-image transparent areas as positives or negatives thereof and in colors ranging from blue-black, blue, green, red, orange, brown and colors in between.

Abstract: A photosensitive composition including a photopolymerizable monomer system and a thermochromic substance which can be used in a phootographic reproduction process which avoids the use of liquid elements for developing and fixing. The process is based on the different dielectric constants and heat losses exhibited by a monomer and the corresponding polymer and the reaction of certain thermochromic substances which exhibit a specific threshold temperature above which these substances change from a colorless form to a colored, stable form.

Abstract: A corona charging device includes a U-shaped corona wire which is mounted between a pair of insulating blocks. One of the blocks has a spring biased plunger which engages the closed end of the wire to thereby place the wire in tension while the other block supports the legs of the wire. The legs of the wire have contact portions thereon which extend into a slot in the associated block. The contact portions are held in engagement with an electrical connector by a wedge. With this arrangement, the corona charging wire is readily replaceable.