Patents by Inventor Victor S. Chang
Victor S. Chang 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: 6583930Abstract: A birefringent interference polarizer which may be fabricated from readily available materials using established coextrusion techniques is provided. The polarizer has a level of light absorption near zero and can be fabricated to polarize and reflect light of specific wavelengths while transmitting light of other wavelengths. The polarizer includes multiple alternating oriented layers of at least first and second polymeric materials having respective nonzero stress optical coefficients which are sufficiently different to produce a refractive index mismatch between the first and second polymeric materials in a first plane which is different from the refractive index mismatch between the first and second polymeric materials in a second plane normal to the first plane. The refractive index mismatch in the first plane is preferably at least 0.03.Type: GrantFiled: December 23, 1998Date of Patent: June 24, 2003Assignee: 3M Innovative PropertiesInventors: Walter J. Schrenk, Victor S. Chang, John A. Wheatley
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Patent number: 5872653Abstract: A birefringent interference polarizer which may be fabricated from readily available materials using established coextrusion techniques is provided. The polarizer has a level of light absorption near zero and can be fabricated to polarize and reflect light of specific wavelengths while transmitting light of other wavelengths. The polarizer includes multiple alternating oriented layers of at least first and second polymeric materials having respective nonzero stress optical coefficients which are sufficiently different to produce a refractive index mismatch between the first and second polymeric materials in a first plane which is different from the refractive index mismatch between the first and second polymeric materials in a second plane normal to the first plane. The refractive index mismatch in the first plane is preferably at least 0.03.Type: GrantFiled: December 18, 1996Date of Patent: February 16, 1999Assignee: Minnesota Mining and Manufacturing CompanyInventors: Walter J. Schrenk, John A. Wheatley, Victor S. Chang
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Patent number: 5612820Abstract: A birefringent interference polarizer which may be fabricated from readily available materials using established coextrusion techniques is provided. The polarizer has a level of light absorption near zero and can be fabricated to polarize and reflect light of specific wavelengths while transmitting light of other wavelengths. The polarizer includes multiple alternating oriented layers of at least first and second polymeric materials having respective nonzero stress optical coefficients which are sufficiently different to produce a refractive index mismatch between the first and second polymeric materials in a first plane which is different from the refractive index mismatch between the first and second polymeric materials in a second plane normal to the first plane. The refractive index mismatch in the first plane is preferably at least 0.03.Type: GrantFiled: May 30, 1995Date of Patent: March 18, 1997Assignee: The Dow Chemical CompanyInventors: Walter J. Schrenk, Victor S. Chang, John A. Wheatley
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Patent number: 5486949Abstract: A birefringent interference polarizer which may be fabricated from readily available materials using established coextrusion techniques is provided. The polarizer has a level of light absorption near zero and can be fabricated to polarize and reflect light of specific wavelengths while transmitting light of other wavelengths. The polarizer includes multiple alternating oriented layers of at least first and second polymeric materials having respective nonzero stress optical coefficients which are sufficiently different to produce a refractive index mismatch between the first and second polymeric materials in a first plane which is different from the refractive index mismatch between the first and second polymeric materials in a second plane normal to the first plane. The refractive index mismatch in the first plane is preferably at least 0.03.Type: GrantFiled: November 26, 1990Date of Patent: January 23, 1996Assignee: The Dow Chemical CompanyInventors: Walter J. Schrenk, John A. Wheatley, Victor S. Chang
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Patent number: 5389463Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a halogenated polyolefin polymer and a filler or a halogenated polyolefin polymer and surfactant/filler agent, said sheet product having a fibrous sheet embedded within said mixture and between the first and second major surfaces. The porosity of the sheet product is at least about 50 volume percent composed of pores such that the average pore diameter increases from each major surface towards the interior of the sheet product's thickness.Type: GrantFiled: April 1, 1993Date of Patent: February 14, 1995Assignee: W. R. Grace & Co.-Conn.Inventors: Victor S. Chang, Richard T. Giovannoni, Richard C. Hartwig, Joseph T. Lundquist, Christian B. Lundsager, Marc E. Parham, Anthony J. Laccetti
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Patent number: 5362581Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a polycarbonate polymer and a filler or a polycarbonate and a structure enhancing agent, said sheet product having a porous sheet embedded within said mixture and between the first and second major surfaces. The porosity of the sheet product is at least about 50 volume percent composed of pores such that the nominal pore diameter increases incrementally from each major surface towards the interior central portion of the sheet product's thickness.Type: GrantFiled: April 1, 1993Date of Patent: November 8, 1994Assignee: W. R. Grace & Co.-Conn.Inventors: Victor S. Chang, Richard C. Hartwig, Joseph T. Lundquist, Marc E. Parham, Anthony J. Laccetti
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Patent number: 5362582Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a polymer and a filler or a polymer and a structure enhancing agent and having a porous sheet embedded between the first and second major surface. The porosity of the sheet product is at least about 50 volume percent having a pore distribution such that the nominal pore diameter increases from each major surface towards the interior central portion of the sheet product's thickness.Type: GrantFiled: April 1, 1993Date of Patent: November 8, 1994Assignee: W.R. Grace & Co.-Conn.Inventors: Victor S. Chang, Richard C. Hartwig, Joseph T. Lundquist, Marc E. Parham, James K. Kung, James A. Avtges, Anthony J. Laccetti