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).
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Patent number: 4707504Abstract: 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: GrantFiled: August 6, 1985Date of Patent: November 17, 1987Assignee: Bayer AktiengesellschaftInventors: Michael Walkowiak, Klaus Nehren, Wolfgang Podszun, Werner Finger
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Patent number: 4552906Abstract: 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: GrantFiled: April 27, 1984Date of Patent: November 12, 1985Assignee: Bayer AktiengesellschaftInventors: Wolfgang Podszun, Fritjof Bley, Michael Walkowiak
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Patent number: 4437836Abstract: 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: GrantFiled: September 1, 1982Date of Patent: March 20, 1984Assignee: Bayer AktiengesellschaftInventors: Robert Schmitz-Josten, Carlhans Suling, Wolfgang Podszun, Bruno Bomer, Manfred Borgardt, Michael Walkowiak
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Patent number: 4394465Abstract: 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: GrantFiled: September 5, 1980Date of Patent: July 19, 1983Assignee: Bayer AktiengesellschaftInventors: Wolfgang Podszun, Michael Walkowiak, Hans-Hermann Schulz
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Patent number: 4389507Abstract: 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: GrantFiled: September 2, 1981Date of Patent: June 21, 1983Assignee: Bayer AGInventors: Wolfgang Podszun, Carlhans Suling, Michael Walkowiak, Hans-Hermann Schulz
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Patent number: 4389496Abstract: The invention relates to thixotropic formulations of silicone pastes for the production of exact impressions of teeth and mucous membrane.Type: GrantFiled: November 12, 1981Date of Patent: June 21, 1983Assignee: Bayer AktiengesellschaftInventors: Bernhard Leusner, Hans-Hermann Schulz, Reiner Voigt, Michael Walkowiak
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Patent number: 4369262Abstract: 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: GrantFiled: July 16, 1981Date of Patent: January 18, 1983Assignee: Bayer AktiengesellschaftInventors: Michael Walkowiak, Wolfgang Podszun, Bernhard Leusner, Carlhans Suling, Hans-Hermann Schulz
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Patent number: 4323348Abstract: 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: GrantFiled: July 31, 1980Date of Patent: April 6, 1982Assignee: Bayer AktiengesellschaftInventors: Robert Schmitz-Josten, Manfred Borgardt, Hans-Hermann Schulz, Michael Walkowiak
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Patent number: 4308190Abstract: 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: GrantFiled: November 19, 1979Date of Patent: December 29, 1981Assignee: Bayer AktiengesellschaftInventors: Michael Walkowiak, Wolfgang Podszun, Bernhard Leusner, Carlhans Suling, Hans H. Schulz
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Patent number: 4302376Abstract: 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: GrantFiled: November 19, 1979Date of Patent: November 24, 1981Assignee: Bayer AktiengesellschaftInventors: Michael Walkowiak, Wolfgang Podszun, Bernhard Leusner, Carlhans Suling, Hans H. Schulz
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Patent number: 4300886Abstract: 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: GrantFiled: June 9, 1980Date of Patent: November 17, 1981Assignee: Bayer AktiengesellschaftInventors: Carlhans Suling, Gerhard Balle, Bernd Leusner, Hans-Hermann Schulz, Michael Walkowiak
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Patent number: 4277536Abstract: 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: GrantFiled: November 13, 1979Date of Patent: July 7, 1981Assignee: Bayer AktiengesellschaftInventors: Wolfgang Podszun, Carlhans Suling, Michael Walkowiak, Hans H. Schulz
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Patent number: 4233424Abstract: 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: GrantFiled: April 25, 1978Date of Patent: November 11, 1980Assignee: Bayer AktiengesellschaftInventors: Carlhans Suling, Gerhard Balle, Michael Walkowiak, Hans-Hermann Schulz
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Patent number: 4223114Abstract: 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: GrantFiled: April 25, 1978Date of Patent: September 16, 1980Assignee: Bayer AktiengesellschaftInventors: Carlhans Suling, Gerhard Balle, Michael Walkowiak, Hans-Hermann Schulz
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Patent number: 4182829Abstract: 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: GrantFiled: May 8, 1978Date of Patent: January 8, 1980Assignee: Bayer AktiengesellschaftInventors: Michael Walkowiak, Hans-Hermann Schulz, Hans J. Rosenkranz
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Patent number: 4177563Abstract: 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: GrantFiled: May 19, 1978Date of Patent: December 11, 1979Assignee: Bayer AktiengesellschaftInventors: Robert Schmitz-Josten, Manfred Borgardt, Hans-Hermann Schulz, Michael Walkowiak, Bernhard Leusner, Carlhans Suling
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Patent number: 4107304Abstract: 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: GrantFiled: June 27, 1975Date of Patent: August 15, 1978Assignee: Bayer AktiengesellschaftInventors: Wilfried Schrock, Hans-Bodo Konig, Michael Preiss, Karl Georg Metzger, Michael Walkowiak
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Patent number: 4093722Abstract: 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: GrantFiled: May 13, 1976Date of Patent: June 6, 1978Assignee: Bayer AktiengesellschaftInventors: Wilfried Schrock, Hans-Bodo Konig, Michael Preiss, Karl Georg Metzger, Michael Walkowiak
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Patent number: 4086340Abstract: 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: GrantFiled: May 12, 1976Date of Patent: April 25, 1978Assignee: Bayer AktiengesellschaftInventors: Wilfried Schrock, Hans-Bodo Konig, Michael Preiss, Karl Georg Metzger, Michael Walkowiak
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Patent number: 4086341Abstract: 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: GrantFiled: July 22, 1976Date of Patent: April 25, 1978Assignee: Bayer AktiengesellschaftInventors: Wolfgang Krohn, Karl Georg Metzger, Michael Preiss, Michael Walkowiak