Patents by Inventor Robert S. Mallouk
Robert S. Mallouk 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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Publication number: 20040067402Abstract: An integral composite membrane is provided including a porous polymeric membrane impregnated with a perfluoro ion exchange material to make the micropores of the membrane occlusive and a surfactant having a molecular weight greater than 100 wherein the thickness of the composite membrane is less than 0.025 mm. Methods for making and regenerating the integral composite membrane are also provided.Type: ApplicationFiled: October 2, 2003Publication date: April 8, 2004Inventors: Barndad Bahar, Alex R. Hobson, Jeffrey A. Kolde, Robert S. Mallouk
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Publication number: 20030113604Abstract: A fuel cell comprising at least one composite membrane which includes a porous support impregnated with ion exchange resin to make the pores of the support occlusive, wherein the thickness of the composite membrane is less than 0.025 mm. The membrane is strong and has good ionic conductivity. Methods of making the composite membrane are also disclosed.Type: ApplicationFiled: October 25, 2002Publication date: June 19, 2003Inventors: Bamdad Bahar, Alex R. Hobson, Jeffrey A. Kolde, Robert S. Mallouk
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Publication number: 20020022123Abstract: A fuel cell comprising at least one composite membrane which includes a porous support impregnated with ion exchange resin to make the pores of the support occlusive, wherein the thickness of the composite membrane is less than 0.025 mm. The membrane is strong and has good ionic conductivity. Methods of making the composite membrane are also disclosed.Type: ApplicationFiled: April 25, 2001Publication date: February 21, 2002Inventors: Bamdad Bahar, Alex R. Hobson, Jeffry A. Kolde, Robert S. Mallouk
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Publication number: 20020011684Abstract: An integral composite membrane is provided including a porous polymeric membrane impregnated with a perfluoro ion exchange material to make the micropores of the membrane occlusive and a surfactant having a molecular weight greater than 100 wherein the thickness of the composite membrane is less than 0.025 mm. Methods for making and regenerating the integral composite membrane are also provided.Type: ApplicationFiled: August 3, 2001Publication date: January 31, 2002Inventors: Bamdad Bahar, Alex R. Hobson, Jeffry A. Kolde, Robert S. Mallouk
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Patent number: 5183545Abstract: A composite, porous, liquid-permeable article is provided which is a multilayer structure of discrete, bonded layers of porous, expanded polytetrafluoroethylene (EPTFE). The composite has its interior and exterior surfaces coated with a perfluoro ion exchange polymer to render the composite hydrophilic so as to resist gas locking in aqueous media. Initially, the diaphragm may also contain a water-soluble surfactant to assist in initial water penetration into the pores of the composite. An improved electrolytic cell is provided having the composite diaphragm as the porous separator in the electrolysis of alkali halide solutions. The diaphragm is also useful as an improved filter medium.Type: GrantFiled: November 15, 1991Date of Patent: February 2, 1993Inventors: Phillip A. Branca, Daniel E. Hubis, Robert S. Mallouk, Randal L. Perry
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Patent number: 5094895Abstract: A composite, porous, liquid-permeable article is provided which is a multilayer structure of discrete, bonded layers of porous, expanded polytetrafluoroethylene (EPTFE), which composite has its interior and exterior surfaces coated with a perfluoro ion exchange polymer to render the composite hydrophilic so as to resist gas locking in aqueous media wherein a composite diaphragm made therefrom, may also contain a water-soluble surfactant to assist in initial water penetration into the pores of the composite whereby an improved electrolytic cell is provided having the composite diaphragm as the porous separator in the electrolysis of alkali halide solutions and wherein the diaphragm is also useful as an improved filter medium.Type: GrantFiled: April 19, 1990Date of Patent: March 10, 1992Inventors: Phillip A. Branca, Daniel E. Hubis, Robert S. Mallouk, Randal L. Perry
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Patent number: 5082472Abstract: A dimensionally stable, composite membrane of a microporous film in laminar contact with a continuous perfluoro ion exchange resin layer is provided. The composite membrane comprises a continuous perfluoro ion exchange polymer layer which has an original, as-prepared, length, width and thickness, the ion exchange polymer layer being in laminar attachment to a film of a microporous material, preferably porous, expanded polytetrafluoroethylene (EPTFE), the microporous film having essentially the same length and width as the as-prepared continuous perfluoro ion exchange layer. The perfluoro ion exchange layer is swollen with a hydrophilic liquid to an extent that the hydrophilic liquid exceeds 20% by weight of the swollen, continuous perfluoro ion exchange layer. The swollen ion exchange layer exhibits less than a 5% increase in either length or width from its original, as-prepared, state, but it exhibits a substantial increase in thickness over its original, as-prepared, state.Type: GrantFiled: November 5, 1990Date of Patent: January 21, 1992Inventors: Robert S. Mallouk, Phillip A. Branca, Randal L. Perry
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Patent number: 4954388Abstract: An abrasion-resistant, tear-resistant, multilayer composite membrane, useful in electrolysis, is provided comprising a continuous perfluoro ion exchange polymer film attached to a reinforcing fabric by means of a porous, expanded polytetrafluoroethylene (EPTFE) interlayer. The fabric and EPTFE are rendered hydrophilic and non-gas-locking by coating the interior and exterior surfaces thereof with a perfluoro ion exchange resin of equivalent weight less than 1000. The composite preferably is treated with an ionic perfluoro surfactant. Also provided is a multilayer composite according to the above in which the continuous perfluoro ion exchange film is itself a multilayer construction of a perfluorosulfonate polymer and a thin layer of perfluorocarboxylate polymer in which the perfluorosulfonate polymer interfaces with the EPTFE and the interior and exterior surfaces of the EPTFE and fabric are coated with perfluorosulfonate polymer.Type: GrantFiled: November 30, 1988Date of Patent: September 4, 1990Inventors: Robert S. Mallouk, Phillip A. Branca, Randal L. Perry
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Patent number: 4902308Abstract: A porous composite membrane is provided comprising a film of porous, expanded polytetrafluoroethylene whose surfaces, both exterior and within its pores, are coated with a metal salt of a perfluoro-cation exchange polymer. Also provided is the method of avoiding false-positive detection of the presence of organic nerve gas agents by a sensor adapted to detect such presence by employing in the sensor a porous composite membrane comprising a film of porous, expanded polytetrafluoroethylene whose surfaces, both exterior and within its pores, are coated with a metal salt of a perfluoro-cation exchange polymer, the composite acting as a scavenger of unwanted gas components which cause the false-positive signals.Type: GrantFiled: June 15, 1988Date of Patent: February 20, 1990Inventors: Robert S. Mallouk, Phillip A. Branca
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Patent number: 4863974Abstract: The present invention provides for a bone growth material for filling in defects or hollow portions of bones to be ingrown by and coalesce with bone tissues wherein the bone growth material is comprised of expanded PTFE and calcium phosphate.Type: GrantFiled: August 3, 1988Date of Patent: September 5, 1989Assignee: W. L. Gore & Associates, Inc.Inventors: Robert S. Mallouk, William P. Mortimer, Jr.
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Patent number: 4351746Abstract: A dielectric composition is disclosed having three separate phases, one electrically conductive, combined to yield a compound dispersion with high dielectric constant and low dissipation factor. The composition is made into a film and the film is used in electrical capacitors.Type: GrantFiled: July 25, 1980Date of Patent: September 28, 1982Assignee: E. I. Du Pont de Nemours and CompanyInventors: Darrell J. Parish, Robert S. Mallouk
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Patent number: RE37307Abstract: An ultra-thin composite membrane is provided which includes a base material and an ion exchange resin. The base material is a membrane which is defined by a thickness of less than 1 mil (0.025 mm) 0.8 mils and a microstructure characterized by node interconnected by fibrils, or a microstructure characterized by fibrils with no nodes present. The ion exchange resin substantially impregnates the membrane such that the membrane is essentially air impermeable.Type: GrantFiled: August 20, 1998Date of Patent: August 7, 2001Assignee: W. L. Gore & Associates, Inc.Inventors: Bamdad A. Bahar, Robert S. Mallouk, Alex R. Hobson, Jeffrey A. Kolde
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Patent number: RE37656Abstract: A composite membrane is provided which includes a base material and an ion exchange resin. The base material has a microstructure characterized by nodes interconnected by fibrils, or a microstructure characterized by fibrils with no nodes present. The ion exchange resin substantially impregnates the membrane such that the membrane is essentially air impermeable.Type: GrantFiled: June 3, 1999Date of Patent: April 16, 2002Assignee: W.L. Gore & Associates, Inc.Inventors: Bamdad Bahar, Robert S. Mallouk, Alex R. Hobson, Jeffrey A. Kolde
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Patent number: RE37701Abstract: A composite membrane is provided which includes a base material and an ion exchange resin. The base material has a microstructure characterized by nodes interconnected by fibrils, or a microstructure characterized by fibrils with no nodes present. The ion exchange resin substantially impregnates the membrane such that the membrane is essentially air impermeable.Type: GrantFiled: April 4, 2000Date of Patent: May 14, 2002Assignee: W. L. Gore & Associates, Inc.Inventors: Bamdad Bahar, Robert S. Mallouk, Alex R. Hobson, Jeffrey A. Kolde