Patents by Inventor Michael Walkowiak

Michael Walkowiak 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: 4707504
    Abstract: The use of microporous inorganic fillers in polymerizable compositions, in particular in the dental field, characterized in that the fillers have(a) an average particle size of 0.5 to 50.mu.,(b) a BET-surface area of at least 200 m.sup.2 /g,(c) a pore volume of 0.7 to 5 ml/g and(d) a pore diameter of 10 to 50 nm.Fillings made therefrom are smooth and easy to polish.
    Type: Grant
    Filed: August 6, 1985
    Date of Patent: November 17, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Walkowiak, Klaus Nehren, Wolfgang Podszun, Werner Finger
  • Patent number: 4552906
    Abstract: A dental composition suitable for being polymerized to a dental prosthesis approximately comprising by weight(A) 20 to 50% of a mixture of monofunctional and polyfunctional methacrylic esters and, optionally, other monomers,(B) 20 to 60% of an essentially non-crosslinked polymer homogeneously filled with microfine inorganic filler and based on (meth)acrylic esters and, optionally, other monomers,(C) 0.5 to 25% of a non-crosslinked polymer having a glass transition temperature.ltoreq.0.degree. C. and a molecular weight M.sub.w of 10.sup.3 -5.times.10.sup.5, and(D) 0 to 40% of a finely divided inorganic filler treated with an adhesion promoter.
    Type: Grant
    Filed: April 27, 1984
    Date of Patent: November 12, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Podszun, Fritjof Bley, Michael Walkowiak
  • Patent number: 4437836
    Abstract: In a photopolymerizable composition comprising(a) at least one ethylenically unsaturated photopolymerizable monomer.(b) at least one photoinitiator selected from organic mono- and/or di-carbonyl compounds and(c) a photoactivator, the improvement which comprises employing as said photoactivator at least one alkylaminoarylsulphonyl compound of the formula ##STR1## in which R.sub.1 and R.sub.2 each independently is a hydrogen atom or an alkyl, alkenyl, cycloalkyl, cycloalkenyl, aryl, aralkyl or alkaryl group which has 1 to 11 carbon atoms and is optionally substituted by at least one hydroxyl, amino, epoxy, urethane, urea, ether of ether group, or R.sub.1 and R.sub.2 together form a 3- to 6-membered ring, which optionally contains nitrogen, oxygen or sulphur as a hetero-atom,R.sub.3 independently of R.sub.1, has any of the meanings given for R.sub.1 or is a group of the formula ##STR2## R.sub.4 and R.sub.
    Type: Grant
    Filed: September 1, 1982
    Date of Patent: March 20, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Robert Schmitz-Josten, Carlhans Suling, Wolfgang Podszun, Bruno Bomer, Manfred Borgardt, Michael Walkowiak
  • Patent number: 4394465
    Abstract: The invention provides dental materials in paste form consisting essentially of (a) 18 to 50% by weight of a polymerizable binder, (b) 20 to 65% by weight of a crosslinked bead polymer with an average particle size of 5 to 150 .mu.m and (c) 5 to 45% by weight of glass beads with an average particle size of 5 to 80 .mu.m. The pastes of the invention are outstandingly suitable as a dental filling material.
    Type: Grant
    Filed: September 5, 1980
    Date of Patent: July 19, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Podszun, Michael Walkowiak, Hans-Hermann Schulz
  • Patent number: 4389507
    Abstract: Polymer beads having an average bead diameter of from 5 to 500 .mu., consisting of an inorganic fine-particled filler and polymerized (meth)acrylic acid esters, and a process for their production, wherein a mixture of monomer and, optionally, polymer which is soluble in the monomer, which has a viscosity of from 0.1 to 10 Pa.s, measured at the dispersion temperature, and filler is suspended in an aqueous medium in the presence of dispersants and is polymerized.
    Type: Grant
    Filed: September 2, 1981
    Date of Patent: June 21, 1983
    Assignee: Bayer AG
    Inventors: Wolfgang Podszun, Carlhans Suling, Michael Walkowiak, Hans-Hermann Schulz
  • Patent number: 4389496
    Abstract: The invention relates to thixotropic formulations of silicone pastes for the production of exact impressions of teeth and mucous membrane.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: June 21, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernhard Leusner, Hans-Hermann Schulz, Reiner Voigt, Michael Walkowiak
  • Patent number: 4369262
    Abstract: The invention includes dental materials based on organic plastics in paste form, comprising at least one phase consisting essentially of finely divided, crosslinked plastics which contain copolymerized ester(s) of methacrylic acid to the extent of at least 50% by weight, and the second phase consisting essentially of ester(s) of methacrylic acid to the extent of at least 50% by weight. The materials can be used for making prostheses, crowns, bridges, artificial teeth, dental fillings, etc.
    Type: Grant
    Filed: July 16, 1981
    Date of Patent: January 18, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Walkowiak, Wolfgang Podszun, Bernhard Leusner, Carlhans Suling, Hans-Hermann Schulz
  • Patent number: 4323348
    Abstract: The invention relates to the provision of dental compositions containing a polymerizable (meth)acrylic acid ester of the formula Id as defined herein and includes methods for filling or repairing teeth in warm-blooded animals.
    Type: Grant
    Filed: July 31, 1980
    Date of Patent: April 6, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Robert Schmitz-Josten, Manfred Borgardt, Hans-Hermann Schulz, Michael Walkowiak
  • Patent number: 4308190
    Abstract: A dental material is provided based on organic plastics in paste form, which consists essentially of (a) a polymerizable binder, (b) a crosslinked bead polymer and (c) a fine-particled inorganic filler.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: December 29, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Walkowiak, Wolfgang Podszun, Bernhard Leusner, Carlhans Suling, Hans H. Schulz
  • Patent number: 4302376
    Abstract: The invention provides dental materials which are opaque to X-rays and are based on organic plastics in paste form, which comprises (a) a polymerizable binder, (b) a crosslinked bead polymer and (c) an X-ray contrast medium. The materials can also contain as an additional component (d) a fine-particled inorganic filler which is not opaque to X-rays. The materials are useful, inter alia, for filing dental cavities.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: November 24, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Walkowiak, Wolfgang Podszun, Bernhard Leusner, Carlhans Suling, Hans H. Schulz
  • Patent number: 4300886
    Abstract: The invention relates to bead polymers, useful in the provision of dental articles and made by bead polymerizing a diamine-lengthened polyurethane and a methacrylate. Also included in the invention are the dental articles made using said bead polymers.
    Type: Grant
    Filed: June 9, 1980
    Date of Patent: November 17, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Carlhans Suling, Gerhard Balle, Bernd Leusner, Hans-Hermann Schulz, Michael Walkowiak
  • Patent number: 4277536
    Abstract: Bead polymers having a mean bead diameter of from 10 to 200.mu. of one or more polymerized viscous methacrylates and/or dimethacrylates having a viscosity of from 0.5 to 500 Pa.s and, optionally, up to 20% by weight of one or more other vinyl monomers.
    Type: Grant
    Filed: November 13, 1979
    Date of Patent: July 7, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Podszun, Carlhans Suling, Michael Walkowiak, Hans H. Schulz
  • Patent number: 4233424
    Abstract: A two-phase bead polymer having an average bead diameter of 10 to 120.mu., and comprising (A) 88 to 99.5% by weight of a polymer of polymerized units of at least one methacrylic acid ester containing from 1 to 10 carbon atoms in the aliphatic, saturated alcohol component, the methacrylic ester polymer, optionally, containing up to 30% by weight of copolymerized units of at least one monomer selected from acrylic acid esters containing from 1 to 10 carbon atoms in the aliphatic saturated alcohol component, hydroxyalkyl esters of methacrylic acid containing from 2 to 4 carbon atoms in the alkyl group, styrene, vinyl acetate, (meth)acrylamide, (meth)acrylic acid and/or itaconic acid, and (B) 0.5 to 12% by weight of a polyurethane.
    Type: Grant
    Filed: April 25, 1978
    Date of Patent: November 11, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Carlhans Suling, Gerhard Balle, Michael Walkowiak, Hans-Hermann Schulz
  • Patent number: 4223114
    Abstract: A two-phase bead polymer having an average bead diameter of from 10.mu. to 150.mu. comprising(A) 88% to 99.5% by weight of a polymer of polymerized units of at least one methacrylic acid ester containing from 1 to 10 carbon atoms in the aliphatic, saturated alcohol component; and(B) 0.5% to 12% by weight of a polyurethane which has been obtained from (1) at least one dihydroxy compound, (2) a diisocyanate from the group comprising (a) aliphatic diisocyanates having a branched carbon skeleton of 7 to 26 carbon atoms, (b) cycloaliphatic diisocyanates and (c) aliphatic or cycloaliphatic diisocyanates modified by radical graft copolymerization with vinyl monomers, (3) an aliphatic or cycloaliphatic diamine and (4) a monofunctional chain terminator.
    Type: Grant
    Filed: April 25, 1978
    Date of Patent: September 16, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Carlhans Suling, Gerhard Balle, Michael Walkowiak, Hans-Hermann Schulz
  • Patent number: 4182829
    Abstract: The invention provides impression materials for use in dentistry comprising the reaction product of (a) a diisocyanate or triisocyanate, (b) a dihydroxy compound having a molecular weight of from 300 to 10,000 and (c) an unsaturated monohydroxy compound. The invention also includes processes for preparing said impression materials.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: January 8, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Walkowiak, Hans-Hermann Schulz, Hans J. Rosenkranz
  • Patent number: 4177563
    Abstract: The invention includes formulated dental filling materials comprising a polymerizable organic plastics material containing inorganic fillers, which filling material comprises at least two pastes in intimate admixture with one another in a paste/paste system in which hardening is initiated by means of a peroxidic initiator and an accelerator, wherein said at least two pastes contain different inorganic fillers with different chemical constitutions such that one of said at least two pastes contains filler with a substantially higher proportion of elements with high atomic number than does the other of said at least two pastes. Also included in the invention is a dental filling pack containing said formulated dental filling materials as well as a method for their use.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: December 11, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Robert Schmitz-Josten, Manfred Borgardt, Hans-Hermann Schulz, Michael Walkowiak, Bernhard Leusner, Carlhans Suling
  • Patent number: 4107304
    Abstract: Cephalosporins of the formula ##STR1## their pharmaceutically-acceptable, nontoxic salts, and hydrates thereof are produced, whereinA is hydrogen; unsubstituted or substituted alkyl; aryl; or R.sub.1 --X--, whereinX is --CO-- or --SO.sub.2 --, andR.sub.1 is hydrogen, unsubstituted or substituted alkyl; aryl; thienyl; furyl; amino; alkylamino; dialkylamino; pyrrolidyl; or piperidyl;Or whenX is --CO--,R.sub.1 can also be alkoxy;B is phenyl, methylphenyl, chlorophenyl, hydroxyphenyl or the moiety ##STR2## E is hydrogen, hydroxyl or acetoxy; and C is a center of chirality.These compounds are particularly useful for their antimicrobial and, particularly, antibacterial effects.
    Type: Grant
    Filed: June 27, 1975
    Date of Patent: August 15, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Schrock, Hans-Bodo Konig, Michael Preiss, Karl Georg Metzger, Michael Walkowiak
  • Patent number: 4093722
    Abstract: Cephalosporins of the formula ##STR1## their pharmaceutically-acceptable, nontoxic salts, and hydrates thereof are produced, whereinA is hydrogen; unsubstituted or substituted alkyl; aryl; or R.sub.1 --X--, whereinX is -CO- or -SO.sub.2 -, andR.sub.1 is hydrogen, unsubstituted or substituted alkyl; aryl; thienyl; furyl; amino; alkylamino; dialkylamino; pyrrolidyl; or piperidyl;Or whenX is -CO-,R.sub.1 can also be alkoxy;B is phenyl, methylphenyl, chlorophenyl, hydroxyphenyl or the moiety ##STR2## E is hydrogen, hydroxyl or acetoxy; and C is a center of chirality.These compounds are particularly useful for their antimicrobial and, particularly, antibacterial effects.
    Type: Grant
    Filed: May 13, 1976
    Date of Patent: June 6, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Schrock, Hans-Bodo Konig, Michael Preiss, Karl Georg Metzger, Michael Walkowiak
  • Patent number: 4086341
    Abstract: Penicillin and cephalosporin derivatives characterized by the presence of a nitroalkyl, nitrocycloalkyl, nitrophenylalkyl or nitroanilinoalkyl group in the side chain are antibacterial agents. The compounds, of which 6-(2-nitro-3,3-dimethylbutyrylamido)-penicillanic acid, 7-nitroacetamido-3-methyl-ceph-3-em-4-carboxylic acid, and 6-[D-.alpha.-(2-nitro-2-methylpropionylamido)phenylacetamido]-penicillanic acid are typical embodiments, are prepared by reacting 6-amino-penicillanic acid, 7-amino-cephalosporanic acid (or derivative thereof) or an .alpha.-substituted-.alpha.-amino-acetamido-penicillanic acid with an appropriate nitrated carboxylic acid or an equivalent nitrated acylating agent.
    Type: Grant
    Filed: July 22, 1976
    Date of Patent: April 25, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Krohn, Karl Georg Metzger, Michael Preiss, Michael Walkowiak
  • Patent number: 4086340
    Abstract: Cephalosporins of the formula ##STR1## their pharmaceutically-acceptable, nontoxic salts, and hydrates thereof are produced, whereinA is hydrogen; unsubstituted or substituted alkyl; aryl; or R.sub.1 --X--, whereinX is --CO-- or --SO.sub.2 --, andR.sub.1 is hydrogen, unsubstituted or substituted alkyl; aryl; thienyl; furyl; amino; alkylamino; dialkylamino; pyrrolidyl; or piperidyl;Or whenX is --CO--,R.sub.1 can also be alkoxy;B is phenyl, methylphenyl, chlorophenyl, hydroxyphenyl or the moiety ##STR2## E is hydrogen, hydroxyl or acetoxy; and C is a center of chirality.These compounds are particularly useful for their antimicrobial and, particularly, antibacterial effects.
    Type: Grant
    Filed: May 12, 1976
    Date of Patent: April 25, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Schrock, Hans-Bodo Konig, Michael Preiss, Karl Georg Metzger, Michael Walkowiak