Patents by Inventor Wendell A. Ehrhart
Wendell A. Ehrhart 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: 6083660Abstract: Photopolymerizable plastisol and organosol photoresist and solder mask coating compositions are described herein. These compositions include an ethylenically unsaturated photopolymerizable liquid plasticizer; a particulate, thermoplastic resin is dispersed in the plasticizer, the said resin having a midpoint Tg greater than 110.degree. C. and an acid number greater than 110; a tertiary amine stabilizer; and a photoinitiator. The organosol includes a diluent along with the other ingredients.Type: GrantFiled: May 11, 1995Date of Patent: July 4, 2000Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, David A. Smith
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Patent number: 6060214Abstract: Photopolymerizable plastisol and organosol photoresist and solder mask coating compositions are described herein. These compositions include an ethylenically unsaturated photopolymerizable liquid plasticizer; a particulate, thermoplastic resin is dispersed in the plasticizer, the said resin having a midpoint Tg greater than 110.degree. C. and an acid number greater than 110; a tertiary amine stabilizer; and a photoinitiator. The organosol includes a diluent along with the other ingredients.Type: GrantFiled: July 23, 1992Date of Patent: May 9, 2000Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, David A. Smith
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Patent number: 5891582Abstract: A resin composition comprises an acrylated polyester, the polyester being the reaction product of an equivalent excess of 1,6-hexanediol and an aromatic polycarboxylic acid or anhydride, preferably trimellitic anhydride. In the preferred embodiment, the reaction product includes a highly ethoxylated triacrylate. Upon UV initiated polymerization or copolymerization, improved clear coatings for "no-wax" resilient floors are obtained. These coatings have better resistance to household and other stains than commercial urethane/acrylate floor coverings.Type: GrantFiled: June 30, 1997Date of Patent: April 6, 1999Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, Songvit Setthachayanon
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Patent number: 5663003Abstract: A resin composition comprises an acrylated polyester, the polyester being the reaction product of an equivalent excess of 1,6-hexanediol and an aromatic polycarboxylic acid or anhydride, preferably trimellitic anhydride. In the preferred embodiment, the reaction product includes a highly ethoxylated triacrylate. Upon UV initiated polymerization or copolymerization, improved clear coatings for "no-wax" resilient floors are obtained. These coatings have better resistance to household and other stains than commercial urethane/acrylate floor coverings.Type: GrantFiled: May 10, 1996Date of Patent: September 2, 1997Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, Songvit Setthachayanon
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Patent number: 5543232Abstract: A resin composition comprises an acrylated polyester, the polyester being the reaction product of an equivalent excess of 1,6-hexanediol and an aromatic polycarboxylic acid or anhydride, preferably trimellitic anhydride. In the preferred embodiment, the reaction product includes a highly ethoxylated triacrylate. Upon UV initiated polymerization or copolymerization, improved clear coatings for "no-wax" resilient floors are obtained. These coatings have better resistance to household and other stains than commercial urethane/acrylate floor coverings.Type: GrantFiled: April 6, 1995Date of Patent: August 6, 1996Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, Songvit Setthachayanon
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Patent number: 5362560Abstract: A rigid tile has a flexible interlocking edge configuration and a pressure-sensitive adhesive layer. To increase the ease of installation, an inert powder is dusted on the periphery of the adhesive layer.Type: GrantFiled: May 20, 1993Date of Patent: November 8, 1994Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, Raymond C. Kent
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Patent number: 5248443Abstract: A seam cleaning paste, cream or liquid is disclosed, which comprises a hydrocarbon solvent and a finely divided inorganic powder. Treatment of the area near the seams of various types of floor coverings, especially highly stain resistant and soil resistant floor coverings, does not significantly change the appearance of the floor nor its resistance to soiling or staining. Yet it results in much improved adhesion of certain seam coaters subsequently applied to bridge the seam and prevent dirt from lodging therein. These creams do not exaggerate bubble formation in subsequently applied seam coaters and in fact, preferred embodiments help prevent such bubbles from forming.Type: GrantFiled: November 9, 1992Date of Patent: September 28, 1993Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, William T. Sigman, Albert C. Weidman
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Patent number: 5198521Abstract: A water reaction synthesis with polyoxyethylene diol, diisocyanate and dibutyltin bis lauryl mercaptide produces a high molecular weight thermoplastic polyurethane-urea linear polymer with surface resistivity 10.sup.11 -10.sup.6 ohm/sq. Thermoplastic and/or elastomeric antistatic compositions containing other melt processable polymers and/or filler, and the polymer exhibit permanent protection. Antistatic protection can be increased when the polymer complexes with a metal salt such as lithium chloride, or lithium acetate. The composition is useful in the manufacture of antistatic floor coverings and textile texturing and drafting elements such as cots and aprons.Type: GrantFiled: October 29, 1991Date of Patent: March 30, 1993Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, Nowaf Halout, Kenneth K. Ko, David A. Smith
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Patent number: 5198142Abstract: A seam cleaning paste, cream or liquid is disclosed, which comprises a hydrocarbon solvent and a finely divided inorganic powder. Treatment of the area near the seams of various types of floor coverings, especially highly stain resistant and soil resistant floor coverings, does not significantly change the appearance of the floor nor its resistance to soiling or staining. Yet it results in much improved adhesion of certain seam coaters subsequently applied to bridge the seam and prevent dirt from lodging therein. These creams do not exaggerate bubble formation in subsequently applied seam coaters and in fact, preferred embodiments help prevent such bubbles from forming.Type: GrantFiled: July 29, 1991Date of Patent: March 30, 1993Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, William T. Sigman, Albert C. Weidman
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Patent number: 5140088Abstract: The floor covering of the present invention has a wear layer and/or seam coater which is a high T.sub.g urethane composition. While most floor covering urethanes have a T.sub.g of from 18.degree. C. to 23.degree. C., the T.sub.g of the present urethane is above about 40.degree. C., and preferably from about 48.degree. C. to about 55.degree. C. The T.sub.g of the prior art has been increased by altering the composition of the aromatic acid based polyester polyols used in the prior art moisture curable prepolymers. By raising the precursor polyol to dicarboxylic acid ratio, the polyester polyols produced have lower equivalent weights. This alone results in a polyurethane-urea of higher T.sub.g at a given alicyclic diisocyanate to polyester equivalent ratio. However, increases in the T.sub.g may also be obtained by replacing some or all of long chain flexible polyol precursors (e.g. triethylene glycol) with shorter and/or less flexible polyol precursors. The high T.sub.g improves stain resistance.Type: GrantFiled: January 22, 1991Date of Patent: August 18, 1992Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, James R. Petzold
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Patent number: 5077330Abstract: A water reaction synthesis with polyoxyethylene diol, diisocyanate and dibutyltin bis lauryl mercaptide produces a high molecular weight thermoplastic polyurethane-urea linear polymer with surface resistivity 10.sup.11 -10.sup.6 ohm/sq. Thermoplastic and/or elastomeric antistatic compositions containing other melt processable polymers and/or filler, and the polymer exhibit permanent protection. Antistatic protection can be increased when the polymer complexes with a metal salt such as lithium chloride, or lithium acetate.Type: GrantFiled: May 4, 1990Date of Patent: December 31, 1991Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, Nowaf Halout, Kenneth K. Ko, David A. Smith
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Patent number: 5045435Abstract: An aqueous photopolymer composition is produced by adding a monomer to a latex of a partially neutralized carboxylated acrylic copolymer, having an acid number greater than 80, along with photoinitator and components to produce an aqueous coatable and alkali developable photoresist composition. Preferred neutralization is 30-50% for dip-coating and 40-60% for screen-printing to produce 1 mil lines and 1 mil space after ultraviolet exposure and mild alkali development.Type: GrantFiled: March 12, 1990Date of Patent: September 3, 1991Assignee: Armstrong World Industries, Inc.Inventors: Diane L. Adams, Wendell A. Ehrhart, Donald Jones
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Patent number: 5003026Abstract: Gloss retention and stain resistance are improved in a no-wax UV cured flooring wear surface by reacting a phthalate polyester polyol and a long chain hydroxy acrylate with an aromatic or cycloalkyl diisocyanate to form an oligomer which is employed as a major ingredient of the UV curable coating composition used to produce the wear surface.Type: GrantFiled: June 22, 1989Date of Patent: March 26, 1991Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, David A. Smith
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Patent number: 4595626Abstract: The present invention relates to conformable tile products which may be formed from aggregate material and relatively low weight percentages of unsaturated polyester resin precursors. When cured, the tiles may be adhered to subfloors utilizing ordinary resilient flooring-type adhesives. Further, they will be conformable to subsurface irregularities, and will have high strength and impact resistance when installed as a flooring surface.Type: GrantFiled: January 28, 1985Date of Patent: June 17, 1986Assignee: Armstrong World Industries, Inc.Inventors: Mary A. Brubaker, Wendell A. Ehrhart, William Y. Whitmore
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Patent number: 4496674Abstract: The present invention relates to gasketing materials comprising a rubber binder, a pulverized rice hull filler and a polyester which preferably is crystallizable. The rice hull material acts as a reinforcing filler and, in combination with the rubber and polyester, provides gasketing materials which demonstrate the ability to conform to flange irregularities. As a result, the gaskets demonstrate remarkable sealing capabilities. When they comprise nitrile rubbers, they are also resistant to fuel absorption.Type: GrantFiled: November 17, 1983Date of Patent: January 29, 1985Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, Ronald S. Lenox, Moses Sparks, Jr.
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Patent number: 4436784Abstract: The present invention relates to polyurethane coatings and to processes for preparing and applying said coatings whereby a prepolymer composition comprising a moisture-curable prepolymer and a plasticizer is prepared and applied to a substrate. When cured, the coated substrate demonstrates good wearability, stain resistance, and appearance, yet the use of volatile solvents may be avoided.Type: GrantFiled: February 25, 1982Date of Patent: March 13, 1984Assignee: Armstrong World Industries, Inc.Inventor: Wendell A. Ehrhart
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Patent number: 4304879Abstract: A family of non-crystallizing acrylated polyester resins are described in which the polyesters are formed by reacting a mixture of 100 mol percent dicarboxylic acids of which 50 to 100 mol percent is isophthalic acid; 0 to 25 mol percent is terephthalic acid; and 0 to 50 mol percent is one or more dicarboxylic acids other than isophthalic or terephthalic; with an excess of two or more primary glycols, the maximum mol percent of any one glycol being dependent on the amount of isophthalic acid with the upper limit being established by the line A-B of the FIGURE of the Drawing.Type: GrantFiled: October 20, 1980Date of Patent: December 8, 1981Assignee: Armstrong World Industries, Inc.Inventors: Wendell A. Ehrhart, David A. Smith
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Patent number: 4260717Abstract: A liquid heat and moisture reactive coating composition, especially adapted for forming a no-wax coating on plastic flooring products. The coating is a solvent solution of a polyester having an acid number of less than about 3 and an average hydroxyl equivalent weight of between about 750 to 1400 and an aliphatic diisocyanate. The polyester is based on a mixture of dicarboxylic acids of which at least 75 weight percent is one or more of the isomeric benzene dicarboxylic acids and a mixture of polyols having a hydroxyl equivalent weight of less than about 130. Of the polyol mixture, at least 60 weight percent is 1,6-hexanediol or 1,5-pentanediol or mixtures thereof with no more than 15 weight percent being polyols having a functionality greater than 2. Based on 100 parts by weight reactants, 55 to 90 parts by weight of said polyester is reacted with 10 to 30 parts by weight of an aliphatic diisocyanate in the presence of 0.Type: GrantFiled: January 10, 1980Date of Patent: April 7, 1981Inventor: Wendell A. Ehrhart
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Patent number: 4033583Abstract: A tennis racket or the like having a slip clutch in the handle of the racket. When a tennis ball strikes on or near the frame to the side of the tennis racket head, there is a tendency for the head of the racket to twist around a longitudinal axis extending through the handle of the racket. The slip clutch permits the head of the racket to rotate relative the handle of the racket to lessen the transmission of shock forces from the head of the racket to the arm of the user of the tennis racket.Type: GrantFiled: March 16, 1976Date of Patent: July 5, 1977Inventor: Wendell A. Ehrhart