Patents by Inventor John E. Eitel

John E. Eitel 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).

  • Acrylic sheet having uniform distribution of coloring and mineral filler before and after thermoforming
    Patent number: 5747154
    Abstract: Ranges of chain-transfer agents, thixotropic agents, and alumina trihydrate content are balanced to minimize migration or maldistribution of coloring matter and alumina trihydrate during curing of methyl methacrylate in a syrup including polymethylmethacrylate and also during subsequent heating and deformation in thermoforming, to achieve constancy of impact resistance and improve stability of patterns even in deformed portions of formed sheets.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: May 5, 1998
    Assignee: Aristech Chemical Corporation
    Inventors: Ettore Minghetti, John E. Eitel, Carol A. Wetter
  • Thermoformable acrylic sheet having uniform distribution of color and mineral filler
    Patent number: 5705552
    Abstract: A composition suitable for making thermoformable sheets and the like. The composition comprises a crosslinked poly (methyl methacrylate) typically having uncrosslinked poly (methyl methacrylate) dispersed therein. The composition a comprises 0.5 to about 1.0 pph of at least one crosslinking agent x, and up to about 0.58x-0.28 pph of a at least one chain terminator. The composition also comprises about 0.1 to 8 pph poly (methyl methacrylate) compatible plasticizer, and has about 20 to 60 wt % solid particle dispersed therein.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: January 6, 1998
    Assignee: Aristech Chemical Corporation
    Inventors: Ettore Minghetti, John E. Eitel, Carol A. Wetter
  • Acrylic sheet having uniform distribution of coloring and mineral filler before and after thermoforming
    Patent number: 5567745
    Abstract: Ranges of chain-transfer agents, thixotropic agents, and alumina trihydrate content are balanced to minimize migration or maldistribution of coloring matter and alumina trihydrate during curing of methyl methacrylate in a syrup including polymethylmethacrylate and also during subsequent heating and deformation in thermoforming, to achieve constancy of impact resistance and improve stability of patterns even in deformed portions of formed sheets.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: October 22, 1996
    Assignee: Aristech Chemical Corporation
    Inventors: Ettore Minghetti, John E. Eitel, Carol A. Wetter
  • Process of making acrylic-filled thermoformable acrylic sheet
    Patent number: 5530041
    Abstract: A monomer-rich acrylic syrup is cast including about 10% to about 20% ground acrylic particles. During curing, the particles absorb over half their weight in monomer, and a cured sheet is formed in which the matrix monomer and uncrosslinked polymer form a phase which extends through the particles, while the particles appear to be fused together. Including a crosslinker in the syrup further insures the interpenetration of the matrix phase into the swollen particles. A textured surface is formed, which is useful as an anti-slip surface in bathtubs and shower stalls, after thermoforming.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: June 25, 1996
    Assignee: Aristech Chemical Corporation
    Inventors: Ettore Minghetti, John E. Eitel
  • Acrylic sheet having uniform distribution of coloring and mineral filler before and after thermoforming
    Patent number: 5521243
    Abstract: Ranges of chain-transfer agents, thixotropic agents, and alumina trihydrate content are balanced to minimize migration or maldistribution of coloring matter and alumina trihydrate during curing of methyl methacrylate in a syrup including polymethylmethacrylate and also during subsequent heating and deformation in thermoforming, to achieve constancy of impact resistance and improve stability of patterns even in deformed portions of formed sheets.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: May 28, 1996
    Assignee: Aristech Chemical Corporation
    Inventors: Ettore Minghetti, John E. Eitel, Carol A. Wetter
  • Acrylic-filled thermoformable acrylic sheet
    Patent number: 5415931
    Abstract: A monomer-rich acrylic syrup is cast including about 10% to about 20% ground acrylic particles. During curing, the particles absorb over half their weight in monomer, and a cured sheet is formed in which the matrix monomer and uncrosslinked polymer form a phase which extends through the particles, while the particles appear to be fused together. Including a crosslinker in the syrup further insures the interpenetration of the matrix phase into the swollen particles. A textured surface is formed, which is useful as an anti-slip surface in bathtubs and shower stalls, after thermoforming.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: May 16, 1995
    Assignee: Aristech Chemical Corporation
    Inventors: Ettore Minghetti, John E. Eitel
  • Acrylic-filled thermoformable acrylic sheet
    Patent number: 5242968
    Abstract: A monomer-rich acrylic syrup is cast including about 10% to about 20% ground acrylic particles. During curing, the particles absorb over half their weight in monomer, and a cured sheet is formed in which the matrix monomer and uncrosslinked polymer form a phase which extends through the particles, while the particles appear to be fused together. Including a crosslinker in the syrup further insures the interpenetration of the matrix phase into the swollen particles. A textured surface is formed, which is useful as an anti-slip surface in bathtubs and shower stalls, after thermoforming.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: September 7, 1993
    Assignee: Aristech Chemical Corporation
    Inventors: Ettore Minghetti, John E. Eitel