Patents by Inventor Mark D. Gehlsen
Mark D. Gehlsen 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: 8576357Abstract: In a liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management films, including a diffuser layer, lie between the light source and the LCD panel to provide bright, uniform illumination. In some embodiments, the diffuser layer is attached to the lower side of the LCD panel. Some, or all, of the light management layers may be attached together as a laminated stack of films. In some embodiments, the diffuser layer is formed with a recessed region on one side and another optical film positioned within the recessed region.Type: GrantFiled: March 15, 2010Date of Patent: November 5, 2013Assignee: 3M Innovative Properties CompanyInventors: Mark D. Gehlsen, Linda M. Rivard, Ryan T. Fabick, James W. Laumer, Kenneth A. Epstein, Byung-soo Ko, Ji-Hyung Kim, Sang-Dae Kim, Ji-Hwa Lee
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Patent number: 8125589Abstract: In a directly-illuminated liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management films, including a diffuser layer, lie between the light source and the LCD panel to provide bright, uniform illumination. The diffuser layer is attached to a substrate which is separate from the light source and the LCD panel, or may be attached to either the LCD panel or, when using a two dimensional light source, to the light source. The other light management layers may also be attached to the separate substrate or to the LCD panel or two-dimensional light source. High levels of illumination uniformity at the LCD may be achieved with a uniform (non-patterned) diffuser, even with relatively low levels of diffusion, when the diffuser is used with a brightness enhancing layer.Type: GrantFiled: October 31, 2008Date of Patent: February 28, 2012Assignee: 3M Innovative Properties CompanyInventors: Byungsoo Ko, Mark D. Gehlsen, Chingwen Chen, Robert M. Emmons, James W. Laumer, Ji-Hyung Kim, Ji-Hwa Lee, Kang-il Seo, Ryan T. Fabick, Linda M. Rivard, Kenneth A. Epstein, Chideuk Kim, Youngsoo Park
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Patent number: 7924368Abstract: An optical assembly includes a light diffusing layer attached to a reflective polarizing layer. An intermediate region between the light diffusing layer and the reflective polarizing layer includes an intermediate structure that defines voids between the light diffusing layer and the reflective polarizing layer.Type: GrantFiled: December 8, 2005Date of Patent: April 12, 2011Assignee: 3M Innovative Properties CompanyInventors: Ryan T. Fabick, Stephen J. Etzkorn, Mark D. Gehlsen
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Publication number: 20110051392Abstract: The present application describes light management assemblies comprising a light transmissive plate, optical film, and a cover film which covers at least one major surface of the light transmissive plate. Optical film(s) may be adjacent or attached to the outside of the cover film or contained within the cover film between the light transmissive plate and the cover film. The present application also describes a method of making a liquid crystal display device using the light management assemblies described in this application.Type: ApplicationFiled: June 27, 2008Publication date: March 3, 2011Inventors: James P. DiZio, Stephen J. Etzkorn, Ryan T. Fabick, Mark D. Gehlsen, Kenneth J. Hanley, Maureen C. Nelson, Masaki Yamamuro
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Publication number: 20110037736Abstract: An optical device has a first film (200) that has a first side and a second side. When illuminated by light (204) at the first side, the first film is characterized by a first fraction of broadly diffused transmitted light (206) and a second fraction of narrowly diffused transmitted light (208). A second film (202) is disposed to the second side of the first film. The second film has at least one free surface that diverts light. In some embodiments, the first film has a diffuse scattering optical density between 0.5 and 3. The device finds use in spreading and making light uniform in a backlight in a display such as a liquid crystal display.Type: ApplicationFiled: February 13, 2009Publication date: February 17, 2011Inventors: Kenneth A. Epstein, Stephan J. Etzkorn, Eric W. Nelson, Mark D. Gehlsen, Brian G. Koethe
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Patent number: 7879441Abstract: Polymer foam articles prepared by melt-mixing a polymer composition and a plurality of microspheres, at least one of which is an expandable polymeric microsphere, under process conditions, including temperature and shear rate, selected to form an expandable extrudable composition; and extruding the composition through a die.Type: GrantFiled: April 30, 2004Date of Patent: February 1, 2011Assignee: 3M Innovative Properties CompanyInventors: Mark D. Gehlsen, Bradley S. Momchilovich
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Patent number: 7766531Abstract: A display system includes a display panel and a backlight disposed behind the display panel. The backlight has a light guide and at least one light source that directs light into an edge of the light guide. The light guide comprises a front layer facing the display panel, a back layer facing away from the display panel, and a plurality of connecting members connecting the front and back layers. The spaces formed between the connecting members and the upper and the first and second layers are referred to as flutes. Light from the light source may propagate along the flutes.Type: GrantFiled: March 29, 2006Date of Patent: August 3, 2010Assignee: 3M Innovative Properties CompanyInventors: Susan E. Anderson, Mark D. Gehlsen, James T. Richard
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Publication number: 20100188754Abstract: In a liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management films, including a diffuser layer, lie between the light source and the LCD panel to provide bright, uniform illumination. In some embodiments, the diffuser layer is attached to the lower side of the LCD panel. Some, or all, of the light management layers may be attached together as a laminated stack of films. In some embodiments, the diffuser layer is formed with a recessed region on one side and another optical film positioned within the recessed region.Type: ApplicationFiled: March 15, 2010Publication date: July 29, 2010Inventors: Mark D. Gehlsen, Linda M. Rivard, Ryan T. Fabick, James W. Laumer, Kenneth A. Epstein, Byung-soo Ko, Ji-Hyung Kim, Sang-Dae Kim, Ji-Hwa Lee
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Patent number: 7710511Abstract: In a liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management films, including a diffuser layer, lie between the light source and the LCD panel to provide bright, uniform illumination. In some embodiments, the diffuser layer is attached to the lower side of the LCD panel. Some, or all, of the light management layers may be attached together as a laminated stack of films. In some embodiments, the diffuser layer is formed with a recessed region on one side and another optical film positioned within the recessed region.Type: GrantFiled: October 6, 2005Date of Patent: May 4, 2010Assignee: 3M Innovative Properties CompanyInventors: Mark D. Gehlsen, Linda M. Rivard, Ryan T. Fabick, James W. Laumer, Kenneth A. Epstein, Byung-soo Ko, Ji-Hyung Kim, Sang-Dae Kim, Ji-Hwa Lee
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Publication number: 20090122228Abstract: In a directly-illuminated liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management films, including a diffuser layer, lie between the light source and the LCD panel to provide bright, uniform illumination. The diffuser layer is attached to a substrate which is separate from the light source and the LCD panel, or may be attached to either the LCD panel or, when using a two dimensional light source, to the light source. The other light management layers may also be attached to the separate substrate or to the LCD panel or two-dimensional light source. High levels of illumination uniformity at the LCD may be achieved with a uniform (non-patterned) diffuser, even with relatively low levels of diffusion, when the diffuser is used with a brightness enhancing layer.Type: ApplicationFiled: October 31, 2008Publication date: May 14, 2009Inventors: Byungsoo Ko, Mark D. Gehlsen, Chingwen Chen, Robert M. Emmons, James W. Laumer, Ji-Hyung Kim, Ji-Hwa Lee, Kang-il Seo, Ryan T. Fabick, Linda M. Rivard, Kenneth A. Epstein, Chideuk Kim, Youngsoo Park
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Patent number: 7491434Abstract: A novel polymodal asymmetric elastomeric block copolymer and a pressure sensitive adhesive, tape and adhesive backed article made therefrom, such as a polymer foam article having a substantially smooth surface prepared by melt-mixing a polymer composition and a plurality of microspheres, at least one of which is an expandable polymeric microsphere, under process conditions, including temperature and shear rate, selected to form an expandable extrudable composition; and extruding the composition through a die.Type: GrantFiled: June 15, 2004Date of Patent: February 17, 2009Assignee: 3M Innovative Properties CompanyInventors: Ashish K. Khandpur, JingJing Ma, Mark D. Gehlsen, Bradley S. Momchilovich, John J. Stradinger
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Patent number: 7446827Abstract: In a directly-illuminated liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management films, including a diffuser layer, lie between the light source and the LCD panel to provide bright, uniform illumination. The diffuser layer is attached to a substrate which is separate from the light source and the LCD panel, or may be attached to either the LCD panel or, when using a two dimensional light source, to the light source. The other light management layers may also be attached to the separate substrate or to the LCD panel or two-dimensional light source. High levels of illumination uniformity at the LCD may be achieved with a uniform (non-patterned) diffuser, even with relatively low levels of diffusion, when the diffuser is used with a brightness enhancing layer.Type: GrantFiled: October 15, 2004Date of Patent: November 4, 2008Assignee: 3M Innovative Properties CompanyInventors: Byungsoo Ko, Mark D. Gehlsen, Chingwen Chen, Robert M. Emmons, James W. Laumer, Ji-Hyung Kim, Ji-Hwa Lee, Kang-il Seo, Ryan T. Fabick, Linda M. Rivard, Kenneth A. Epstein, Chideuk Kim, Youngsoo Park
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Patent number: 7436469Abstract: In a directly-illuminated liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management layers lie between the light source and the LCD panel to provide bright, uniform illumination. The light management layers, including, for example, a diffuser, a reflective polarizer and a brightness enhancing layer, are contained in a light management unit that is formed from two subassemblies. The two subassemblies each contain a substrate and are attached together so as to leave a gap between the two subassemblies. The diffuser is located in one of the subassemblies, and the other light management layers may be in either of the subassemblies, or may be disposed in the gap between the subassemblies.Type: GrantFiled: October 15, 2004Date of Patent: October 14, 2008Assignee: 3M Innovative Properties CompanyInventors: Mark D. Gehlsen, Chingwen Chen, Byungsoo Ko, Robert M. Emmons, James W. Laumer, Ryan T. Fabick, Linda M. Rivard, Kenneth A. Epstein, Youngsoo Park, Chideuk Kim, James A. Stevenson
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Publication number: 20080002256Abstract: An optical article has a substrate including a reflective polarizing element preferentially reflecting light having a first polarization state and preferentially transmitting light having a second polarization state and a beaded layer disposed on the substrate. The beaded layer includes transparent binder and a plurality of transparent beads dispersed therein. A normal angle gain of the optical article with the beaded layer is increased when compared to a normal angle gain of the same optical article but without the beaded layer.Type: ApplicationFiled: June 30, 2006Publication date: January 3, 2008Inventors: Itsuroh Sasagawa, Wei Feng Zhang, Yan Yan Zhang, Hoon-Sung Jung, Byung-soo Ko, Ji-Hwa Lee, Wonho Lee, Mark D. Gehlsen, Stephen J. Etzkorn, Susan E. Anderson
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Patent number: 7163741Abstract: A novel polymodal asymmetric elastomeric block copolymer and a pressure sensitive adhesive, tape and adhesive backed article made therefrom, such as a polymer foam article having a substantially smooth surface prepared by melt-mixing a polymer composition and a plurality of microspheres, at least one of which is an expandable polymeric microsphere, under process conditions, including temperature and shear rate, selected to form an expandable extrudable composition; and extruding the composition through a die.Type: GrantFiled: July 1, 2003Date of Patent: January 16, 2007Assignee: 3M Innovative Properties CompanyInventors: Ashish K. Khandpur, Jingjing Ma, Mark D. Gehlsen, Bradley S. Momchilovich, John J. Stradinger
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Patent number: 7094463Abstract: The present invention is directed to a process for producing a polypropylene foam by mixing a high melt strength polypropylene and a blowing agent to form a melt mixture, reducing the temperature of the melt mixture at the exit of the apparatus to an exit temperature that is no more than 30° C. above the melt temperature of the neat polypropylene while maintaining the melt mixture at a pressure sufficient to prevent foaming; passing the mixture through said exit shaping orifice and exposing the mixture to atmospheric pressure, whereby the blowing agent expands causing cell formation resulting in foam formation, and orienting said foam. The foam is useful as tape backings, thermal and acoustical insulation and as a diffuse reflector for use in optical applications such as computer displays.Type: GrantFiled: December 30, 2002Date of Patent: August 22, 2006Assignee: 3M Innovative Properties CompanyInventors: Christopher K. Haas, Mark D. Gehlsen, Sara B. Mortenson, Joan M. Strobel, Ravi K. Sura, David L. Vall
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Patent number: 6864322Abstract: The present invention relates to a double-sided pressure sensitive adhesive foam tape. In certain embodiments the foam tape does not require the use of a release liner. Elimination of the release liner reduces the cost of the tape and also avoids problems associated with damage to the liner during traditional tape manufacturing from exposure to e-beam radiation.Type: GrantFiled: June 20, 2003Date of Patent: March 8, 2005Assignee: 3M Innovative Properties CompanyInventors: Mark D. Gehlsen, Peter A. Stark, Bradley S. Momchilovich
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Publication number: 20040260024Abstract: The present invention relates to a double-sided pressure sensitive adhesive foam tape. In certain embodiments the foam tape does not require the use of a release liner. Elimination of the release liner reduces the cost of the tape and also avoids problems associated with damage to the liner during traditional tape manufacturing from exposure to e-beam radiation.Type: ApplicationFiled: June 20, 2003Publication date: December 23, 2004Applicant: 3M Innovative Properties CompanyInventors: Mark D. Gehlsen, Peter A. Stark, Bradley S. Momchilovich
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Patent number: RE42048Abstract: The present invention relates to a double-sided pressure sensitive adhesive foam tape. In certain embodiments the foam tape does not require the use of a release liner. Elimination of the release liner reduces the cost of the tape and also avoids problems associated with damage to the liner during traditional tape manufacturing from exposure to e-beam radiation.Type: GrantFiled: March 7, 2007Date of Patent: January 18, 2011Assignee: 3M Innovative Properties CompanyInventors: Mark D. Gehlsen, Peter A. Stark, Bradley S. Momchilovich
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Patent number: RE45747Abstract: Polymer foam articles prepared by melt-mixing a polymer composition and a plurality of microspheres, at least one of which is an expandable polymeric microsphere, under process conditions, including temperature and shear rate, selected to form an expandable extrudable composition; and extruding the composition through a die.Type: GrantFiled: January 23, 2014Date of Patent: October 13, 2015Assignee: 3M INNOVATIVE PROPERTIES COMPANYInventors: Mark D. Gehlsen, Bradley S. Momchilovich