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).

  • Patent number: 6083660
    Abstract: 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: Grant
    Filed: May 11, 1995
    Date of Patent: July 4, 2000
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, David A. Smith
  • Patent number: 6060214
    Abstract: 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: Grant
    Filed: July 23, 1992
    Date of Patent: May 9, 2000
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, David A. Smith
  • Patent number: 5891582
    Abstract: 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: Grant
    Filed: June 30, 1997
    Date of Patent: April 6, 1999
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, Songvit Setthachayanon
  • Patent number: 5663003
    Abstract: 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: Grant
    Filed: May 10, 1996
    Date of Patent: September 2, 1997
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, Songvit Setthachayanon
  • Patent number: 5543232
    Abstract: 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: Grant
    Filed: April 6, 1995
    Date of Patent: August 6, 1996
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, Songvit Setthachayanon
  • Patent number: 5362560
    Abstract: 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: Grant
    Filed: May 20, 1993
    Date of Patent: November 8, 1994
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, Raymond C. Kent
  • Patent number: 5248443
    Abstract: 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: Grant
    Filed: November 9, 1992
    Date of Patent: September 28, 1993
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, William T. Sigman, Albert C. Weidman
  • Patent number: 5198521
    Abstract: 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: Grant
    Filed: October 29, 1991
    Date of Patent: March 30, 1993
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, Nowaf Halout, Kenneth K. Ko, David A. Smith
  • Patent number: 5198142
    Abstract: 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: Grant
    Filed: July 29, 1991
    Date of Patent: March 30, 1993
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, William T. Sigman, Albert C. Weidman
  • Patent number: 5140088
    Abstract: 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: Grant
    Filed: January 22, 1991
    Date of Patent: August 18, 1992
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, James R. Petzold
  • Patent number: 5077330
    Abstract: 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: Grant
    Filed: May 4, 1990
    Date of Patent: December 31, 1991
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, Nowaf Halout, Kenneth K. Ko, David A. Smith
  • Patent number: 5045435
    Abstract: 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: Grant
    Filed: March 12, 1990
    Date of Patent: September 3, 1991
    Assignee: Armstrong World Industries, Inc.
    Inventors: Diane L. Adams, Wendell A. Ehrhart, Donald Jones
  • Patent number: 5003026
    Abstract: 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: Grant
    Filed: June 22, 1989
    Date of Patent: March 26, 1991
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, David A. Smith
  • Patent number: 4595626
    Abstract: 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: Grant
    Filed: January 28, 1985
    Date of Patent: June 17, 1986
    Assignee: Armstrong World Industries, Inc.
    Inventors: Mary A. Brubaker, Wendell A. Ehrhart, William Y. Whitmore
  • Patent number: 4496674
    Abstract: 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: Grant
    Filed: November 17, 1983
    Date of Patent: January 29, 1985
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, Ronald S. Lenox, Moses Sparks, Jr.
  • Patent number: 4436784
    Abstract: 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: Grant
    Filed: February 25, 1982
    Date of Patent: March 13, 1984
    Assignee: Armstrong World Industries, Inc.
    Inventor: Wendell A. Ehrhart
  • Patent number: 4304879
    Abstract: 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: Grant
    Filed: October 20, 1980
    Date of Patent: December 8, 1981
    Assignee: Armstrong World Industries, Inc.
    Inventors: Wendell A. Ehrhart, David A. Smith
  • Patent number: 4260717
    Abstract: 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: Grant
    Filed: January 10, 1980
    Date of Patent: April 7, 1981
    Inventor: Wendell A. Ehrhart
  • Patent number: 4033583
    Abstract: 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: Grant
    Filed: March 16, 1976
    Date of Patent: July 5, 1977
    Inventor: Wendell A. Ehrhart