Patents Assigned to American Hoechst Corporation
  • Developer composition with sodium, lithium and/or potassium salts for developing negative working imaged photographic material
    Patent number: 4436807
    Abstract: This invention relates to a composition for developing photosensitive coatings especially coatings useful in making lithographic printing plates. The developing composition comprises an aqueous solution having a pH of from about 8 to about 12 of(a) a sodium, potassium or lithium salt of octyl, decyl or dodecyl monosulfate; and(b) a sodium, lithium, potassium or ammonium metasilicate salt; and(c) a lithium, potassium, sodium or ammonium borate salt; and(d) an aliphatic dicarboxylic acid, or sodium, potassium or ammonium salt thereof having from 2 to 6 carbon atoms; and(e) di-and/or tri-sodium or -potassium phosphate.
    Type: Grant
    Filed: July 15, 1982
    Date of Patent: March 13, 1984
    Assignee: American Hoechst Corporation
    Inventor: John E. Walls
  • Photopolymer cleavage imaging system
    Patent number: 4435496
    Abstract: Disclosed are novel photosensitive compositions containing a compound consisting essentially of repeating structural units of an alkyl aryl ether, which are end-capped with a substituent functional group containing an ethylenically unsaturated moiety, and a photosensitizing effective amount of a free radical generating compound. Through the selected exposure of films and coatings prepared from the above composition, it is possible to record information in such materials in a manner as to alter the physical and/or chemical properties of such films and coatings. This selective modification can then be simply manifested by contacting the exposed surface of the film or coating, subsequent to such exposure, with an alkaline developing solution. These compositions are useful in the graphic arts and in the manufacture of printed curcuit boards for the electronics industry.
    Type: Grant
    Filed: September 22, 1982
    Date of Patent: March 6, 1984
    Assignee: American Hoechst Corporation
    Inventors: John E. Walls, Tulay Duyal
  • Tetrahydrothiophene derivatives and methods of preparation
    Patent number: 4434293
    Abstract: The novel compounds cis-3-hydroxy-4-mercaptotetrahydrothiophene (I) and octahydrodithieno(3,4-b:3',4'e) 1,4-dithin (II) are prepared from 1,4-dithiothreitol and 1,4-dithioerythritol respectively. (I) has utility as an antibacterial agent. (II) has utility as an odorant.
    Type: Grant
    Filed: August 5, 1981
    Date of Patent: February 28, 1984
    Assignee: American Hoechst Corporation
    Inventor: Robert A. Sanchez
  • Method for producing an aluminum support useful for lithography
    Patent number: 4427500
    Abstract: An improved substrate suitable for use as a base for a lithographic printing plate, especially a plate useful for the production of continuous tone images. The substrate is produced by extremely uniformly graining an aluminum sheet which has a highly polished, mirror-like surface.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: January 24, 1984
    Assignee: American Hoechst Corporation
    Inventor: Stephan J. Platzer
  • System and method for producing artwork for printed circuit boards
    Patent number: 4424519
    Abstract: System and method utilizing a laser beam to produce artwork for printed circuit boards. The laser beam is modulated in accordance with the artwork and scanned across an output medium to form an image of the artwork. Compensation is provided for chromatic aberration and non-linearities which would otherwise detract from the quality and accuracy of the image.
    Type: Grant
    Filed: March 19, 1981
    Date of Patent: January 3, 1984
    Assignee: American Hoechst Corporation
    Inventors: Don B. Neumann, Lyle K. Norton, Eric V. Olson
  • System and method for producing artwork for printed circuit boards
    Patent number: 4422083
    Abstract: Laser imaging system for imaging printed circuit artwork on an output medium such as a photosensitive film, a glass plate or a printed circuit board. The laser beam scans the output medium and is modulated in accordance with the image to be formed. A correction signal is applied to the modulator to maintain substantially uniform exposure across the output medium notwithstanding variations in the velocity of the beam.
    Type: Grant
    Filed: March 19, 1981
    Date of Patent: December 20, 1983
    Assignee: American Hoechst Corporation
    Inventors: Don B. Neumann, Lyle K. Norton, Eric V. Olson
  • Imaging system and method for printed circuit artwork and the like
    Patent number: 4419675
    Abstract: Imaging system and method suitable for producing artwork masters for use in the manufacture of printed circuit boards. A beam of coherent radiation is modulated in accordance with data from a source defining the image to be produced, and the modulated beam is scanned across an output medium to form the desired image. A reference signal is generated in accordance with the position of the beam on the output medium, and this signal is shifted forward in phase to compensate for any delay between the generation of the reference signal and the arrival of the modulated beam at the output medium.
    Type: Grant
    Filed: May 24, 1979
    Date of Patent: December 6, 1983
    Assignee: American Hoechst Corporation
    Inventors: Don B. Neumann, Lyle K. Norton, Eric V. Olson
  • Electrolytic graining of aluminum with nitric and boric acids
    Patent number: 4416972
    Abstract: Aluminum is electrolytically grained in an aqueous solution of nitric and boric acids to provide a surface structure suitable for use as part of a lithographic printing plate. The electrolyte may also optionally contain hydrogen peroxide and/or aluminum nitrate.
    Type: Grant
    Filed: June 26, 1981
    Date of Patent: November 22, 1983
    Assignee: American Hoechst Corporation
    Inventors: John E. Walls, Robert L. Dragon, Thomas A. Dunder
  • High stability polarizer
    Patent number: 4416946
    Abstract: The invention relates to a highly hydrolytically stable polarizer element having a moisture barrier flurocarbon film as its supporting substrate.
    Type: Grant
    Filed: April 5, 1982
    Date of Patent: November 22, 1983
    Assignee: American Hoechst Corporation
    Inventor: Lawrence Bolt
  • Method and apparatus for treating strand-like material
    Patent number: 4414756
    Abstract: An improved method and apparatus for treating strand-like material is described. The method comprises conveying loops of such strand-like material supported by conveyor means through a heating zone wherein provision is made for causing certain portions of said loop material to experience substantial peripheral sliding movement in their contact with and with respect to said conveyor means, which movement has been found to reduce irregularities in the subsequent dyeing of the strand-like material.
    Type: Grant
    Filed: October 30, 1981
    Date of Patent: November 15, 1983
    Assignee: American Hoechst Corporation
    Inventors: Carroll Simpson, Ludwig Schierl
  • Antidepressant (.alpha.-phenyl-2-tolyl)azacycloalkanols and derivatives thereof
    Patent number: 4414219
    Abstract: Novel azacycloalkanes, azacycloalkenes and derivatives thereof and methods of preparing same are described. These compounds are useful as antidepressants, anticonvulsants, tranquilizers and analgetics.
    Type: Grant
    Filed: August 1, 1980
    Date of Patent: November 8, 1983
    Assignee: American Hoechst Corporation
    Inventors: Lawrence L. Martin, Helen H. Ong, Vernon B. Anderson, Charles A. Crichlow
  • Cathodic deposition of light sensitive components
    Patent number: 4414311
    Abstract: Light sensitive compounds are deposited onto a hydrophilized metal substrate, which is preferably aluminum, by means of a direct current electromotive force. The light sensitive component is dissolved in a current carrying solvent. Cathodic, hydrophilized, aluminum is passed through the solution and the EMF applied. The result is a light sensitive coating on the hydrophilized substrate surface.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: November 8, 1983
    Assignee: American Hoechst Corporation
    Inventors: John E. Walls, Thomas A. Dunder
  • Material and method for removing immunoglobulins from whole blood
    Patent number: 4409330
    Abstract: An immunoadsorbent material comprising inactivated, protein-A bearing Staphlococcus aureus immobilized in a polymeric matrix is used to remove IgG immunoglobulins and immune complexes from whole blood.
    Type: Grant
    Filed: November 24, 1980
    Date of Patent: October 11, 1983
    Assignee: American Hoechst Corporation
    Inventor: John K. Pollard, Jr.
  • Spiro(indoline-3,4'-piperidine) and related compounds
    Patent number: 4408050
    Abstract: Novel spiro[indoline-3,4'-piperidine]s and related compounds and methods of preparing same are described. These compounds are useful as antidepressants, anticonvulsants and tranquilizers. Also described is a novel method of preparing indoline rings.
    Type: Grant
    Filed: December 18, 1981
    Date of Patent: October 4, 1983
    Assignee: American Hoechst Corporation
    Inventors: Helen H. Ong, James A. Profitt
  • System and method for producing artwork for printed circuit boards
    Patent number: 4404569
    Abstract: System and method utilizing a laser beam to produce artwork for printed circuit boards. The laser beam is modulated in accordance with the artwork and scanned across an output medium to form an image of the artwork. Compensation is provided for chromatic aberration and non-linearities which would otherwise detract from the quality and accuracy of the image.
    Type: Grant
    Filed: March 19, 1981
    Date of Patent: September 13, 1983
    Assignee: American Hoechst Corporation
    Inventors: Don B. Neumann, Lyle K. Norton, Eric V. Olson
  • Erythrocyte preparations and use thereof in hemagglutination tests
    Patent number: 4403037
    Abstract: Erythrocytes are coated with specific hemagglutinating virus antigen and then treated to produce a stabilized, antigen coated erythrocyte preparation which is used in the determination of antibody in biological fluids.
    Type: Grant
    Filed: October 10, 1980
    Date of Patent: September 6, 1983
    Assignee: American Hoechst Corporation
    Inventor: Stephen R. Coates
  • Precision traveling optical table assembly
    Patent number: 4402482
    Abstract: Precision traveling optical table assembly having a rigid support framework and a rigid rectangular framework. The rigid rectangular framework is supported at three locations upon the rigid support framework. The rectangular framework includes a pair of spaced parallel rails. An optical table is provided. Carriages are mounted upon the pair of rails for longitudinal movement relative to the rails. The optical table is supported at only three locations from the carriages. A drive mechanism is connected between the carriages and the rectangular framework for causing relative movement between the optical table and the rectangular framework. At least one optical element is carried by the optical table.
    Type: Grant
    Filed: July 14, 1980
    Date of Patent: September 6, 1983
    Assignee: American Hoechst Corporation
    Inventors: Steven K. Harbaugh, Frank R. Mitchell
  • Method of forming copper complexes of azo-dyestuffs using non-salt-forming copper (II) compounds
    Patent number: 4400317
    Abstract: A method of directly producing copperized azo-dyestuffs of predetermined inorganic salt content is disclosed wherein an ortho, ortho'-dihydroxyazo-dyestuff is reacted with about one molar equivalent of a copper (II) compound consisting of from 1.0 to 0.1 molar equivalent of a non-salt-forming copper compound selected from CuCO.sub.3.Cu(OH).sub.2, 2CuCO.sub.3.Cu(OH).sub.2, Cu(OH).sub.2, CuO and mixtures thereof, and correspondingly from 0 to 0.9 molar equivalent of a salt-forming copper (II) compound selected from CuSO.sub.4, CuCl.sub.2 and Cu(NO.sub.3).sub.2. The disclosed method provides standard strength copperized dyestuff compositions at increased yields and without the need to precipitate the product from the reaction solution.
    Type: Grant
    Filed: July 9, 1981
    Date of Patent: August 23, 1983
    Assignee: American Hoechst Corporation
    Inventor: Anthony J. Corso
  • Novel electrolytes for electrochemically treated metal plates
    Patent number: 4399021
    Abstract: According to the invention there is provided an electrochemical process for applying a firmly bonded insoluble metal oxide-organic complex on a metal surface by employing the metal as anode and a water-soluble polybasic organic acid as electrolyte. The polybasic acid may be a polyphosphonic acid, polyphosphoric and polycarboxyl acid, or polysulfonic acid and is advantageously polymeric. Polyvinyl phosphonic acid (PVPA) is a preferred electrolyte. Repetitive cycle pulsed direct current is used. The insoluble metal oxide-organic complex formed is composed of anodic oxide combined with polyacid, which forms a protective layer on the metal of improved corrosion resistance. The metal oxide-organic complex is well-suited to bond light sensitive coatings thereto. The metal may be steel, aluminum or magnesium.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: August 16, 1983
    Assignee: American Hoechst Corporation
    Inventors: Thomas N. Gillich, John E. Walls, Stanley F. Wanat, William J. Rozell
  • Imaging system and method with improved boundary detection
    Patent number: 4399469
    Abstract: System and method for reproducing images having areas of different color density scanned by a beam. A signal corresponding to an average level of color density within the target area of the beam is provided and compared with the signal from the central portion of the target area to detect the boundaries between the areas of different color density.
    Type: Grant
    Filed: April 23, 1980
    Date of Patent: August 16, 1983
    Assignee: American Hoechst Corporation
    Inventor: Yung Lew