Patents Represented by Law Firm Keil, Thompson & Shurtleff
  • Patent number: 4128852
    Abstract: The invention is directed to a tape transport mechanism for recording and playing back video signals comprising a contact winding mechanism with tape-guiding means at the capstan and a magnetic tape in which the substrate is a polyethylene terephthalate film. The coated side of the tape, during transport, is in contact with the guide surface of the guide means, and no part of the transport mechanism at which slip could occur during the tape transport is allowed to be in contact with the tape substrate. The tape is wound with its substrate on the inside and its coated side is preferably abrasive with respect to the guide surface, which latter may advantageously consist either of steel or a ceramic material. The bonding agent of the magnetic dispersion -- preferably a chromium dioxide dispersion -- may be prepared from a polyurethane/polyvinyl chloride mixture which imparts the desired hardness to the tape.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: December 5, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Senkpiel, Klaus Schoettle, Heinrich Wittkamp, Karl Uhl
  • Patent number: 4128545
    Abstract: Azo dyes having a 2,6-diamino-pyridine as coupling component, one of the amino groups bearing a bicyclic or polycyclic non-aromatic radical as a substituent. The dyes are eminently suitable as disperse dyes, particularly for synthetic linear polyesters, and give bright dyeings having excellent fastness properties.
    Type: Grant
    Filed: December 19, 1973
    Date of Patent: December 5, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Johannes Dehnert, Gunther Lamm
  • Patent number: 4128511
    Abstract: Water-soluble, crosslinked nitrogen-containing condensation products, the viscosity of which, in aqueous solution, increases with increasing temperature, are obtained by reacting a chlorohydrin-ether of the formula ##STR1## where x is from 50 to 250, y is from 20 to 100, the ratio x:y is from 6.1:1 to 1:15 and n is from 0.5 to 5, with ethyleneimine in the weight ratio of from 1:10.1 to 1:0.8; the condensation products are added to aqueous systems, e.g. polymer solutions and polymer dispersions, to improve the viscosity characteristics.
    Type: Grant
    Filed: August 3, 1977
    Date of Patent: December 5, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Streit, Rolf Fikentscher, Karl Gans, Gerhard Welzel
  • Patent number: 4128569
    Abstract: A process for the continuous manufacture of organic monoisocyanates, diisocyanates and/or polyisocyanates from the corresponding organic amines and phosgene in the presence of inert organic solvents, with recycling of the reaction mixture, wherein the streams of liquid, consisting of the recycle stream and the amine feed solution, are fed to the reaction mixture at a rate such that an energy dissipation density of from 5 to 1,000 kJoule per m.sup.3 of recycled reaction mixture plus amine feed solution is generated in the mixing and reaction zone.
    Type: Grant
    Filed: May 17, 1977
    Date of Patent: December 5, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Horn, Waldemar Koehler, Rolf Bittler
  • Patent number: 4128728
    Abstract: A process for the production of 2,3,6-trimethylphenol in which diethyl ketone is reacted in the presence of a basic reagent with crotonaldehyde or methyl vinyl ketone (or a compound which in the presence of a basic reagent is converted into crotonaldehyde or methyl vinyl ketone) and the 2,5,6-trimethyl-2-cyclohexen-1-one or 2,3,6-trimethyl-2-cyclohexen-1-one formed is dehydrogenated.
    Type: Grant
    Filed: March 4, 1969
    Date of Patent: December 5, 1978
    Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft
    Inventors: Lothar Arnold, Heinrich Pasedach, Horst Pommer
  • Patent number: 4127882
    Abstract: A change-over mechanism for disk-shaped recording media, especially for magnetic films in a sleeve, is provided with a magazine and with selector, transport and drive mechanisms which can provide any desired access to any recording medium and permit trouble-free operation. The mechanism can be used for floppy disks and any type of film-like or rigid recording media.
    Type: Grant
    Filed: August 25, 1976
    Date of Patent: November 28, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Lambert Kohl, Richard Schneider, Karl Uhl
  • Patent number: 4127455
    Abstract: Symmetrical carotenoids are manufactured from the molecular halves thereof by a process wherein phosphonium salts of the molecular halves of these symmetrical carotenoids are oxidized electrochemically in a solvent and in the presence of a base, causing the molecular halves to dimerize, with elimination of substituted phosphine oxide.
    Type: Grant
    Filed: July 20, 1977
    Date of Patent: November 28, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernhard Schulz, Hans Grassner, Peter Jaeger, Heinz Nohe
  • Patent number: 4126414
    Abstract: A specific copolyamide and its use for finishing leather and leather substitutes, particularly those of polyurethane. A particular advantage of the copolyamide is its sealing effect counteracting the migration of dyes, plasticizers and fats, combined with other advantages such as good mechanical properties and the stability of the solutions.
    Type: Grant
    Filed: May 13, 1977
    Date of Patent: November 21, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl Fischer, Peter Horn, Guenter Eckert, Franz Leppmeier
  • Patent number: 4126634
    Abstract: Aminosulfonylcarboxylic acids and their manufacture from diamines and chlorosulfonylcarboxylic acids.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: November 21, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Lucien Thil, Martin Fischer, Wolfgang Kindscher
  • Patent number: 4126582
    Abstract: An improved process for the manufacture of silver catalysts, in which the silver is applied to conventional dimensionally stable and chemically inert carriers, eg. alumina or quartz moldings, preferably by electroless deposition from silver salt solutions onto a great variety of surfaces acting as carriers, by the use of suitable reducing agents. In a particular embodiment, a uniform deposition of silver and a dense and well-adhering silver layer on the surface of the carrier are achieved by adding certain materials to the silver salt solutions.
    Type: Grant
    Filed: August 15, 1977
    Date of Patent: November 21, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans Diem, Christian Dudeck, Werner Simmler, Siegfried Marquardt, Walter Stingl
  • Patent number: 4126279
    Abstract: Winding device with two spaced arms pivotably mounted on a machine frame, each arm carrying a spool holding disc for holding therebetween a spool and the winding formed thereon, the swinging arm being jointed and being associated with a brake surface pressable against a contiguous spool holding disc.
    Type: Grant
    Filed: October 6, 1977
    Date of Patent: November 21, 1978
    Assignee: Barmag Barmer Maschinenfabrik AG
    Inventor: Gerd Munnekehoff
  • Patent number: 4126739
    Abstract: Copolymers, having a uniform structure, of cyclic dienes are obtained by heating a mixture of from 35 to 96% by weight of cyclopentadiene, dicyclopentadiene and/or methyldicyclopentadiene, which may or may not be partially replaced by methylcyclopentadiene or tricyclopentadiene or methyltricyclopentadiene, from 1 to 30% by weight of maleic anhydride, maleic acid or a monoalkyl maleate, which maleic acid or maleic acid derivatives may be partially replaced by other .alpha.,.beta.-olefinically unsaturated monocarboxylic acids or dicarboxylic acids of 3 to 5 carbon atoms, and from 3 to 45% by weight of one or more vinyl-aromatics to 230.degree.-320.degree. C, during which heating the mixture does not remain at from 30.degree. to 230.degree. C for more than 5 hours, and preferably for not more than 2 hours. The copolymers may be used as binders for printing inks and coatings, and as additives in adhesives.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: November 21, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Hoene, Heinz-Hilmar Bankowsky, Eduard Hartmann, Hans-Uwe Schenck, Paul Boerzel
  • Patent number: 4125559
    Abstract: Alkali metal salts of arabonic acid are manufactured by oxidizing D-hexoses in the presence of alkali metal compounds under specific conditions in respect of temperature, pressure, reaction time, sequence of addition of the individual reactants and mixing.The alkali metal salts of arabonic acid which may be manufactured by the process of the invention are valuable starting materials for the manufacture of vitamins, electro-coating assistants, crop protection agents and metal complexing agents.
    Type: Grant
    Filed: May 19, 1977
    Date of Patent: November 14, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Herbert Scholz, Guenther Gotsmann
  • Patent number: 4124591
    Abstract: Isoxazolylmethylthiol carbamates, herbicides containing these compounds, and methods of controlling the growth of unwanted plants with these compounds.
    Type: Grant
    Filed: June 27, 1977
    Date of Patent: November 7, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl Eicken, Hans Theobald, Hanspeter Hansen, Bruno Wuerzer, Kurt Fett
  • Patent number: 4124655
    Abstract: Electrical insulating compositions consisting of an ethylene/vinyl acetate copolymer containing from 0.5 to 9.5 percent by weight of vinyl acetate units, from 0.1 to 2.0 percent by weight of polymerized 2,2,4-trimethyl-1,2-dihydroquinoline, from 0.5 to 5 percent by weight of a triallyl cyanurate and, optionally, up to 0.1 percent by weight of sulfur. The compositions can be crosslinked, with high yield, by treatment with high energy radiation.
    Type: Grant
    Filed: January 11, 1977
    Date of Patent: November 7, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Ernst Koehnlein, Rudolf Glaser, Ludwig Koessler
  • Patent number: 4123773
    Abstract: A servo arrangement for the drive motor of the recording tape of a color video recording and reproducing system, in which a phase detector is included in a tachometer loop for regulating the speed of the drive motor. Another phase detector and a voltage controlled oscillator are included in a tape lock loop for providing to the tachometer loop phase detector a reference derived from off-tape sync information. The voltage controlled oscillator is controlled by the error signal voltage of the tape lock phase detector, and the oscillator output is used as a reference for the tach loop. In one embodiment the oscillator is of the voltage controlled crystal type having a relatively high center frequency which is heterodyned down to a suitable frequency for controlling the tach loop phase detector. In this manner a servo reference of great stability is produced for the tach loop phase detector.
    Type: Grant
    Filed: March 14, 1977
    Date of Patent: October 31, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerhard Rotter, William A. Buchan, Rainer E. AN DER Heiden
  • Patent number: 4123791
    Abstract: A magnetic transducer device for maintaining improved recording tape to transducer head contact at reduced contact pressure. A pair of vertical outrigger bars are mounted on either side of the transducer head transverse to the path of the recording tape. The surfaces of the vertical bars facing the recording tape are located slightly below the plane of the outer surface of the transducer head thereby maintaining a constant, shallow wrap angle of the recording tape over the transducer head. Furthermore, a second pair of horizontal outrigger bars are mounted on either side of and adjacent to the transducer head along an axis transverse to the path of the recording tape.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: October 31, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerhard Rotter, Alojzy Bakowski, Donald L. Burdorf
  • Patent number: 4123774
    Abstract: Methods and apparatus for translating standard broadcast format color television signals to an encoding format for use in a transfer channel, and for retranslation of the signals to broadcast format. In one form of the invention, the broadcast format chroma signal is translated directly to transfer channel format without intermediate reduction to baseband. A second form of the invention achieves the same result by intermediate reduction to baseband of the chroma signal. The transfer channel format comprises chroma information amplitude modulated at a lower frequency than frequency modulated luma information, and enjoys exceptional independence from chroma cross-talk into luma in the restored broadcast signal as well as reduced cross-color distortion due to time base error in recording/playback transfer channels. An optional interlacing system provides even greater resistance to cross modulation effects.
    Type: Grant
    Filed: February 7, 1977
    Date of Patent: October 31, 1978
    Assignee: BASF Aktiengesellschaft
    Inventor: Bernhard A. Hjortzberg
  • Patent number: 4122286
    Abstract: 1,2-Glycol esters are obtained particularly advantageously, by reacting an olefin with molecular oxygen and a carboxylic acid, if a reaction product of o-titanic acid with low molecular weight alcohols or carboxylic acids, e.g. dititanium hexaacetate, is used as the catalyst.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: October 24, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Juergen Hartig, Hans-Martin Weitz
  • Patent number: 4122090
    Abstract: Cyclic esters of 3,4-dihydroxy-thiophene-1,1-dioxide and of the corresponding cyclopentadienone compound, and their manufacture. The compounds can be used as "solid forms" of phosgene, thiophosgene or oxalyl chloride, or as acyl transfer agents.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: October 24, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Steglich, Oswald Hollitzer, Alfred Seewald