Patents Represented by Attorney R. P. Hilst
  • Patent number: 4126385
    Abstract: An acoustooptic material comprising a sterically hindered polyphenyl compound is disclosed. The material is typically a chlorinated para-terphenyl compound. The material is characterized in that its sound attenuation is lower than 10 dB/cm at 40 MHz measured at about 25.degree. C. In another aspect, the polyphenyl compound is mixed with other polymers to form useful acoustooptic materials. In yet another aspect, an acoustic transducer may be associated with the polyphenyl material by molding the transducer in the material or softening a portion of the material with a solvent and attaching the transducer to the softened portion.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: November 21, 1978
    Assignee: Eastman Kodak Company
    Inventors: Richard N. Blazey, Sarah E. Petrie
  • Patent number: 4082551
    Abstract: A unitary photoconductive element having an electrically conducting layer, a photoconductive layer thereover, and a multilayer interlayer composition interposed between the conducting layer and the photoconductive layer. The multilayer interlayer composition comprises a layer containing an acidic polymer material, a layer containing a basic polymer material, and an acid-base reaction product zone formed at the interface of the acidic polymer-containing layer and the basic polymer-containing layer. The multilayer interlayer composition provides good adhesion between the conducting and photoconductive layers of the resultant unitary element and can function as an electrical barrier blocking positive charge carriers which might otherwise be injected into the photoconductive layer from the underlying conducting layer.
    Type: Grant
    Filed: May 26, 1977
    Date of Patent: April 4, 1978
    Assignee: Eastman Kodak Company
    Inventors: David J. Steklenski, Evelio A. Perez Albuerne
  • Patent number: 4050898
    Abstract: Analytical element for the detection of an agent under analysis, termed analyte, dissolved in an aqueous, proteinaceous liquid. The element has at least two superposed layers, the layers including a spreading layer and a reagent layer. The element can include a support material which is preferably radiation transmissive. To normalize transport of the analyte in and through the spreading layer, the spreading layer contains an effective amount of a surfactant, such as a non-ionic surfactant. Preferably, the amount of surfactant is between about 1% and about 15% by weight of solid contents in the spreading layer.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: September 27, 1977
    Assignee: Eastman Kodak Company
    Inventors: Charles A. Goffe, deceased, Royden N. Rand, Tai W. Wu
  • Patent number: 4047952
    Abstract: The use of a soluble, reducible silver salt in combination with an imagewise exposed diffusion transfer photographic element comprising a negative silver halide emulsion and an associated physical development nuclei layer provides a resultant photographic image having intensified maximum density areas with little or no effect on minimum density areas.
    Type: Grant
    Filed: April 28, 1976
    Date of Patent: September 13, 1977
    Assignee: Eastman Kodak Company
    Inventor: Maurice Edgar Pfaff
  • Patent number: 4047953
    Abstract: The use of a 4-thiohydantoine in combination with an image-wise exposed diffusion transfer element comprising a negative silver halide emulsion layer and an associated physical development layer containing cadmium sulfide nuclei and an associated initially immobile dye-providing substance provides improved diffusion transfer dye images.
    Type: Grant
    Filed: April 28, 1976
    Date of Patent: September 13, 1977
    Assignee: Eastman Kodak Company
    Inventor: Maurice Edgar Pfaff
  • Patent number: 4045220
    Abstract: Coloration resistant photoconductive insulating compositions useful in making elements, such as photoconductive electrophotographic papers, are provided. Such compositions comprise (1) an electrically insulating organic binder, (2) a nitrogen-free polyaryl hydrocarbon photoconductor such as those having the formula ##STR1## wherein: N REPRESENTS AN INTEGER HAVING A VALUE OF 0, 1 OR 2,Ar represents an aryl group including substituted aryl such as phenyl, alkylphenyl having 1 to about 10 carbon atoms in the alkyl moiety, alkoxyphenyl having 1 to about 10 carbon atoms in the alkoxy moiety, and the like,Each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represents a hydrogen atom, an aryl group, an alkyl group or an alkoxy group and, when n is O, R.sup.1 and R.sup.4 are both aryl and when R.sup.1 and R.sup.4 are both hydrogen, each of R.sup.2 and R.sup.3 represents an aryl group; and (3) a sensitizer that is substantially non-color forming in the composition.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: August 30, 1977
    Assignee: Eastman Kodak Company
    Inventors: Lawrence E. Contois, Charles J. Fox, Richard W. Stahr
  • Patent number: 4042335
    Abstract: The present invention concerns a multilayer element for the analysis of liquids such as biochemical and biological liquids. Elements according to the invention include (1) a reagent layer including a composition that is interactive in the presence of a predetermined substance to be analyzed (analyte) to provide a diffusible, detectable species, and (2) a registration layer that is permeable to the detectable species and within which such species, e.g., a dye, can be detected. Also within the element, preferably between the reagent layer and the registration layer, there can be a radiation-blocking layer, such as an opaque reflecting layer, to enhance detection of the diffusible species within the registration layer. The element can also include a spreading layer, preferably separated from the registration layer by a reagent layer. In operation, a sample of liquid under analysis is applied to the reagent layer of the element or, if present, to a spreading layer.
    Type: Grant
    Filed: June 25, 1976
    Date of Patent: August 16, 1977
    Assignee: Eastman Kodak Company
    Inventor: Pierre L. Clement
  • Patent number: 4025704
    Abstract: The amine salts of linear polyaniline compounds, including substituted polyaniline compounds, are useful, semiconductors. These materials are generally soluble in popular organic solvents and have resistivities between 10.sup.-.sup.3 and 10.sup.9 ohm-cm. These compounds are useful in the formation of semiconductor compositions, including self-supporting films, and various semiconductor elements such as antistatic films and fibers.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: May 24, 1977
    Assignee: Eastman Kodak Company
    Inventor: Donald J. Trevoy
  • Patent number: 4025691
    Abstract: The amine salts of linear polyaniline compounds, including substituted polyaniline compounds, are useful, semiconductors. These materials are generally soluble in popular organic solvents and have resistivities between 10.sup..sup.-3 and 10.sup.9 ohm-cm. These compounds are useful in the formation of semiconductor compositions, including self-supporting films, and various semiconductor elements such as antistatic films and fibers.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: May 24, 1977
    Assignee: Eastman Kodak Company
    Inventor: Donald J. Trevoy
  • Patent number: 4025463
    Abstract: The amine salts of linear polyaniline compounds, including substituted polyaniline compounds, are useful, semiconductors. These materials are generally soluble in popular organic solvents and have resistivities between 10.sup.-.sup.3 and 10.sup.9 ohm-cm. These compounds are useful in the formation of semiconductor compositions, including self-supporting films, and various semiconductor elements such as antistatic films and fibers.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: May 24, 1977
    Assignee: Eastman Kodak Company
    Inventor: Donald J. Trevoy
  • Patent number: 4025342
    Abstract: The amine salts of linear polyaniline compounds, including substituted polyaniline compounds, are useful, semiconductors. These materials are generally soluble in popular organic solvents and have resistivities between 10.sup.-.sup.3 and 10.sup.9 ohm-cm. These compounds are useful in the formation of semiconductor compositions, including self-supporting films, and various semiconductor elements such as antistatic films and fibers.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: May 24, 1977
    Assignee: Eastman Kodak Company
    Inventor: Donald J. Trevoy
  • Patent number: 4013464
    Abstract: Photoconductive and radioconductive insulating compositions of desirably low dark conductivity and improved resistance to fatigue include tetragonal lead oxide, a binder of polyvinylacetate, polyvinylformal and/or polyvinylbutyral and a small effective amount of an anhydride capable of inhibiting dark conductivity in the composition, particularly under repeated use. Preferred anhydrides are phthalic and maleic anhydrides in an amount of less than about 4 percent of the weight of lead oxide in the composition. Such compositions can be carried on an electrically conductive support to provide elements that are useful for electrophotographic and electroradiographic imaging.
    Type: Grant
    Filed: December 3, 1975
    Date of Patent: March 22, 1977
    Assignee: Eastman Kodak Company
    Inventor: William A. Light
  • Patent number: 3992158
    Abstract: An integral analytical element capable of use in the analysis of liquids, the element having at least two superposed layers including a spreading layer and a reagent layer, in fluid contact. Optionally, the element can be carried on a support material. The spreading layer, which can be an isotropically porous layer, spreads within itself at least a component of a liquid sample applied to the element, or a reaction product of such component, to obtain a uniform concentration of at least one such spread substance at the surface of the spreading layer which faces the reagent layer. The reagent layer, which is desirably uniformly permeable to at least one dissolved or dispersed component of the liquid sample or a reaction product of such a component, can include a matrix in which is distributed a material that can interact with, for example, an analyte or analyte reaction product to produce a detectable change in the element, such as one detectable by measurement of electromagnetic radiation.
    Type: Grant
    Filed: January 2, 1975
    Date of Patent: November 16, 1976
    Assignee: Eastman Kodak Company
    Inventors: Edwin P. Przybylowicz, Allan G. Millikan
  • Patent number: 3947370
    Abstract: Electrostatic latent image developing compositions are disclosed which contain toner granules and carrier particles. The novel carrier particles are comprised of a dispersion of magnetically responsive particulate material in an electrically insulating material which is triboelectrically matched with the toner granules to be electrostatically attractive to the toner granules when mixed therewith.
    Type: Grant
    Filed: December 23, 1970
    Date of Patent: March 30, 1976
    Assignee: Eastman Kodak Company
    Inventor: Howard A. Miller
  • Patent number: 3944493
    Abstract: The present invention relates to the use of low levels of certain alkoxylated amines as charge control agents for an electrostatic toner contained in dry electrographic developer compositions.
    Type: Grant
    Filed: May 16, 1974
    Date of Patent: March 16, 1976
    Assignee: Eastman Kodak Company
    Inventors: Thomas A. Jadwin, Robert C. Storey
  • Patent number: 3938992
    Abstract: The present invention relates to an electrographic developing composition containing finely divided carrier particles and finely divided toner particles having incorporated therein a fusible, crosslinked binder polymer. An improved electrographic developing process using such toner particles is also disclosed.
    Type: Grant
    Filed: August 19, 1974
    Date of Patent: February 17, 1976
    Assignee: Eastman Kodak Company
    Inventors: Thomas A. Jadwin, Ravi Khanna, Stewart H. Merrill, Edmond S. Perry
  • Patent number: 3938994
    Abstract: This invention relates to organic compounds useful as sensitizers for organic photoconductive compositions having one of the following formulas: ##SPC1## ##SPC2##Wherein:R.sup.1 represents a hydrogen atom, an alkyl radical having 1 to about 15 carbon atoms, a substituted alkyl radical wherein the alkyl moiety contains from 1 to about 15 carbon atoms and wherein the substituents are phenyl radicals or alkoxy radicals containing 1 to about 4 carbon atoms, a phenyl radical, and a substituted phenyl radical having as substituents alkyl radicals having 1 to about 15 carbon atoms or alkoxy radicals having 1 to about 4 carbon atoms;R.sup.2 represents R.sup.1 and a radical having the following formula: ##EQU1## X represents a hetero atom selected from the group consisting of an oxygen and a sulfur atom; andZ.sup.- is an anionic function.
    Type: Grant
    Filed: June 18, 1974
    Date of Patent: February 17, 1976
    Assignee: Eastman Kodak Company
    Inventors: George A. Reynolds, James A. Van Allan, Lawrence E. Contois
  • Patent number: 3932179
    Abstract: This application describes a multilayer electrophotographic element composed of a conducting layer, a photoconductive layer, and a polymeric interlayer having a surface resistivity greater than about 10.sup.12 ohm/sq. between the conducting layer and the photoconductive layer. The interlayer comprises a blend of at least two distinct polymeric phases comprising: (a) a film-forming, water- or alkali-soluble polymer, and (b) a film-forming hydrophobic polymer.
    Type: Grant
    Filed: May 31, 1973
    Date of Patent: January 13, 1976
    Assignee: Eastman Kodak Company
    Inventor: Evelio A. Perez-Albuerne