Patents by Inventor Jaroslav Melzer

Jaroslav Melzer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6303002
    Abstract: Paper, board and cardboard are produced from paper stocks which contain tacky impurities by the addition of surfactants and cationic polymers having a charge density of at least 1.5 meq/g (measured at pH 7) and a molar mass Mw of the cationic polymers of at least 15,000 and drainage of the paper stocks with fixation of the tacky impurities in the paper produced.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: October 16, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Jaroslav Melzer, Hubert Meixner
  • Patent number: 4976138
    Abstract: The measuring arrangement consists of successive workstations which comprise a stock of paper samples, a balance, a mechanized moistening means for the sample and a blotting means, likewise mechanized, for the moistened sample. An industrial robot controllable by a program and equipped with a gripping apparatus is provided for carrying out the measurement. This arrangement determines the liquid absorbed by paper using the Cobb method and permits the measuring method to be carried out in a fully mechanized manner.
    Type: Grant
    Filed: May 23, 1989
    Date of Patent: December 11, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Norbert Benninghoff, Manfred Jaensch, Jaroslav Melzer, Gunter Niesar, Werner Schuster
  • Patent number: 4976888
    Abstract: In antifoams based on oil-in-water emulsions, the oil phase of the emulsions contains(a) a C.sub.12 -C.sub.26 -alcohol, a distillation residue which is obtainable in the preparation of alcohols having a relatively large number of carbon atoms by the oxo process or by the Ziegler process and which may furthermore be oxyalkylated and/or(b) a fatty acid ester of a C.sub.12 -C.sub.22 -carboxylic acid with a monohydric to trihydric C.sub.1 -C.sub.18 -alcohol and, if required,(c) a hydrocarbon having a boiling point above 200.degree. C. or a fatty acid of 12 to 22 carbon atoms,accounts for from 5 to 50% by weight of the emulsion and has a mean particle size of less than 25 .mu.m, and from 5 to 50% by weight of components (a) and (b) of the oil phase are replaced by(d) one or more compounds which melt at above 70.degree. C. and are selected from the group consisting of the fatty alcohols of not less than 28 carbon atoms, the esters of a C.sub.1 -C.sub.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: December 11, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Arnold De Clercq, Wolfram Bergold, Hans-Juergen Degen, Jaroslav Melzer
  • Patent number: 4960361
    Abstract: Individual air permeably sheetlike structures are efficiently lifted from a pile by a vacuum lifter and deposited again at a processing station, the pile including as an alternate interlayer a sheet of air impermeable material.
    Type: Grant
    Filed: April 5, 1989
    Date of Patent: October 2, 1990
    Assignee: BASF Aktiengesellschaft
    Inventor: Jaroslav Melzer
  • Patent number: 4952280
    Abstract: The maximum amounts of the retention-influencing variable stock components which can be added are determined as a function of a predetermined degree of flocculation and typical values of the stock suspension with the aid of a mathematical relationship, and control signals for metering retention aids are derived from the amounts so that the greatest possible retention can be achieved without exceeding a set-point for the degree of flocculation.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: August 28, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Ralf Hemel, Jaroslav Melzer
  • Patent number: 4676961
    Abstract: Stabilized water-containing sodium dithionite formulations which have been rendered alkaline have the consistency of a pumpable paste. They additionally contain readily soluble sodium salts and/or potassium salts which are inert to sodium dithionite and whose water-solubility at 20.degree. C. exceeds 500 g/l. These salts are present in the aqueous phase in an amount of not less than 200 g/l. The pastes are useful reducing agents.
    Type: Grant
    Filed: February 22, 1985
    Date of Patent: June 30, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Max Appl, Wilhelm Goesele, Jaroslav Melzer, Siegfried Schreiner, Gert Treiber
  • Patent number: 4664844
    Abstract: In antifoams based on oil-in-water emulsions, the oil phase of the emulsion contains(a) C.sub.12 -C.sub.26 -alcohols, distillation residues obtained in the preparation of alcohols by an oxosynthesis or by the Ziegler process and/or(b) fatty acid esters of C.sub.12 -C.sub.22 -carboxylic acids with monohydric, dihydric or trihydric C.sub.1 -C.sub.18 -alcohols, with or without(c) a hydrocarbon having a boiling point above 200.degree. C. or fatty acids of 12 to 22 carbon atoms,constitutes from 15 to 60% by weight of the emulsion and has a mean droplet size of from 0.5 to 15 .mu.m. The emulsions are stabilized by the addition of from 0.05 to 0.5% by weight, based on the total emulsion, of a high molecular weight water-soluble homopolymer or copolymer of acrylic acid, methacrylic acid, acrylamide or methacrylamide.
    Type: Grant
    Filed: January 11, 1985
    Date of Patent: May 12, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfram Bergold, Jaroslav Melzer
  • Patent number: 4371674
    Abstract: Process for the production of water-soluble auxiliaries for the papermaking industry by reacting(a) 1 part by weight of a polyamidoamine obtained by condensing 1 mole of a dicarboxylic acid having from 4 to 10 carbon atoms with from 0.8 to 1.4 moles of a polyalkylene polyamine having from 3 to 10 alkyleneamine units and containing up to 8 ethyleneimine units per basic nitrogen atom with (b) 0.1 to 4 parts by weight of an .alpha.,.omega.-dichloro polyalkylene oxide obtained by reacting a polyalkylene oxide having from 8 to 100 alkylene oxide units with a compound selected from the group consisting of a thionyl chloride and phosgene and then cleaving the reaction products by heating them to a temperature of from 70.degree. to 150.degree. C. in the presence of a tertiary amine as catalyst,as crosslinking agent, at a temperature above 20.degree. C.
    Type: Grant
    Filed: July 30, 1980
    Date of Patent: February 1, 1983
    Inventors: Otto Hertel, Emil Scharf, Jaroslav Melzer, Rolf Fikentscher
  • Patent number: 4328142
    Abstract: A process for the preparation of water-soluble polymeric crosslinking agents by a two-stage reaction of di-secondary diamines with epichlorohydrin and/or dichlorohydrin, wherein, in the first stage, di-secondary diamines are condensed with epichlorohydrin and/or dichlorohydrin in a molar ratio of from 1:0.5 to 1:1 at a pH of from 9 to 12, and in the second stage the condensates obtained in the first stage are reacted with additional epichlorohydrin and/or dichlorohydrin at a pH of from 4 to 8.5. The water-soluble condensates thus obtained are crosslinking agents for polyamines, polyamidoamines, ethyleneimine-modified polyamidoamines and polyether-amines. The crosslinking reaction gives water-soluble condensates, which possess a high cation activity and may be used as retention aids, drainage aids and flocculants in the manufacture of paper.
    Type: Grant
    Filed: January 15, 1981
    Date of Patent: May 4, 1982
    Assignee: BASF Aktiengesellschaft
    Inventors: Otto Hertel, Emil Scharf, Jaroslav Melzer
  • Patent number: 4104226
    Abstract: Mixtures of high molecular weight polyacrylamides in the form of a water-in-oil polymer dispersion and containing in the inner phase from 99.99 to 95% w/w of a cationic polyacrylamide and from 0.01 to 5% w/w of an anionic polyacrylamide or from 99.99 to 95% w/w of an anionic polyacrylamide and from 0.01 to 5% w/w of a cationic polyacrylamide, all percentages being based on the total amount of polymer. The said polymer mixtures are particularly effective retention aids and flocculants and are preferably used in the manufacture of paper as pulp additives.
    Type: Grant
    Filed: July 21, 1976
    Date of Patent: August 1, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Jaroslav Melzer, Hans-Uwe Schenck