Patents by Inventor John E. Duncan
John E. Duncan 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: 20140211173Abstract: A projection subsystem includes a light engine that provides a collection lens, a collimator and at least one solid state light emitter. A projection lens assembly receives the image and provides a projection beam having a luminous flux level. The projection subsystem has a portability efficacy.Type: ApplicationFiled: January 30, 2013Publication date: July 31, 2014Applicant: 3M INNOVATIVE PROPERTIES COMPANYInventors: Patrick R. Destain, Jennifer L. Grace, John E. Duncan, Tomasz A. Pol, William E. Phillips, III, Michael W. O'Keefe, Alexander A. Glinski, Stephen J. Willett
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Patent number: 8459800Abstract: A projection subsystem includes a light engine that provides a collection lens, a collimator and at least one solid state light emitter. A projection lens assembly receives the image and provides a projection beam having a luminous flux level. The projection subsystem has a portability efficacy.Type: GrantFiled: November 2, 2011Date of Patent: June 11, 2013Assignee: 3M Innovative Properties CompanyInventors: Patrick R. Destain, Jennifer L. Grace, John E. Duncan, Tomasz A. Pol, William E. Phillips, III, Michael W. O'Keefe, Alexander A. Glinski, Stephen J. Willett
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Publication number: 20120287406Abstract: A projection subsystem includes a light engine that provides a collection lens, a collimator and at least one solid state light emitter. A projection lens assembly receives the image and provides a projection beam having a luminous flux level. The projection subsystem has a portability efficacy.Type: ApplicationFiled: November 2, 2011Publication date: November 15, 2012Inventors: Patrick R. Destain, Jennifer L. Grace, John E. Duncan, Tomasz A. Pol, William E. Phillips, III, Michael W. O'Keefe, Alexander Glinski, Stephen J. Willett
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Patent number: 8070295Abstract: A projection subsystem includes a light engine that provides a collection lens, a collimator and at least one solid state light emitter. A projection lens assembly receives the image and provides a projection beam having a luminous flux level. The projection subsystem has a portability efficacy.Type: GrantFiled: January 13, 2011Date of Patent: December 6, 2011Assignee: 3M Innovative Properties CompanyInventors: Patrick R. Destain, Jennifer L. Grace, John E. Duncan, Tomasz A. Pol, William E. Phillips, III, Michael W. O'Keefe, Alexander Glinski, Stephen J. Willett
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Publication number: 20110122371Abstract: A projection subsystem includes a light engine that provides a collection lens, a collimator and at least one solid state light emitter. A projection lens assembly receives the image and provides a projection beam having a luminous flux level. The projection subsystem has a portability efficacy.Type: ApplicationFiled: January 13, 2011Publication date: May 26, 2011Inventors: Patrick R. Destain, Jennifer L. Grace, John E. Duncan, Tomasz A. Pol, William E. Phillips, III, Michael W. O'Keefe, Alexander Glinski, Stephen J. Willett
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Patent number: 7901083Abstract: A projection subsystem includes a light engine that provides a collection lens, a collimator and at least one solid state light emitter. A projection lens assembly receives the image and provides a projection beam having a luminous flux level. The projection subsystem has a portability efficacy.Type: GrantFiled: July 31, 2007Date of Patent: March 8, 2011Assignee: 3M Innovative Properties CompanyInventors: Patrick R. Destain, Jennifer L. Grace, John E. Duncan, Tomasz A. Pol, William E. Phillips, III, Michael W. O'Keefe, Alexander Glinski, Stephen J. Willett
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Patent number: 7529029Abstract: A polarizing beam splitter that includes at least one prism, and a reflective polarizing film. The prism comprises a first polymeric material, and has at least one curved outer surface and an incident surface, where the reflective polarizing film is disposed adjacent the incident surface.Type: GrantFiled: June 28, 2006Date of Patent: May 5, 2009Assignee: 3M Innovative Properties CompanyInventors: John E. Duncan, Michael W. O'Keefe, William E. Phillips, III, Jiaying Ma, Patrick R. Destain
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Patent number: 7463417Abstract: A curable composition is provided which includes an oligomer having a plurality of pendent and/or terminal ethylenically unsaturated, free-radically polymerizable functional groups, a free-radically polymerizable crosslinking agent, and/or a diluent monomer, and a photoinitiator. The composition, when cured, is non-yellowing, exhibits low shrinkage and low birefringence making it suitable for many optical applications such as optical lenses, optical fibers, prisms, light guides, optical adhesives, and optical films.Type: GrantFiled: February 13, 2006Date of Patent: December 9, 2008Assignee: 3M Innovative Properties CompanyInventors: John E. Duncan, Michael W. O'Keefe, Roy A. Auerbach, Peter M. Olofson, Christopher R. Boyer, Ying-Yuh Lu, Jianhui Xia
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Publication number: 20080158669Abstract: Projection screen apparatuses that comprise at least a first and a second projection screen member having different optical properties are described. These screen members can be adapted to connect to each other to form a self-supporting structure in which the first projection screen member is oriented in a viewing position and the second projection screen member is oriented in a support position.Type: ApplicationFiled: December 29, 2006Publication date: July 3, 2008Inventors: Michael W. O'Keefe, John E. Duncan
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Patent number: 7362507Abstract: A polarizing beam splitter is disclosed that includes a first prism, a second prism, and a reflective polarizing film disposed between the first prism and the second prism. The first prism comprises a first polymeric material, and has a first outer curved surface and an additional outer surface. The second prism comprises a second polymeric material, which in some embodiments may be the same as the first polymeric material, and has a second outer curved surface.Type: GrantFiled: July 29, 2005Date of Patent: April 22, 2008Assignee: 3M Innovative Properties CompanyInventors: John E. Duncan, Michael W. O'Keefe, William E. Phillips, Jiaying Ma, Patrick R. Destain
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Publication number: 20080013051Abstract: An image display system including an illumination source configured to emit a light beam, a polarizing beam splitter, and an image-forming device. The polarizing beam splitter includes a reflective polarizer and an absorptive polarizer disposed adjacent to the reflective polarizer, where the absorptive polarizer is configured to receive a first portion of the light beam that has transmitted through the reflective polarizer. The image-forming device is disposed to receive a second portion of the light beam that has been reflected by the reflective polarizer.Type: ApplicationFiled: July 14, 2006Publication date: January 17, 2008Inventors: Alexander L. Glinski, John E. Duncan, Charles L. Bruzzone, Audrey A. Sherman
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Patent number: 6257380Abstract: A hysteresis brake including a casing having internal alternating first slots and first teeth, a pole having external alternating second slots and second teeth, a rotor including an annular portion located in spaced relationship between the casing and pole, and structure for permitting the pole and casing to be rotationally adjusted relative to each other and to lock the first slots and teeth of the casing in a rotationally adjusted position relative to the second slots and teeth of the pole to cause the brake to provide a torque output of a substantially predetermined value at a predetermined current. A method of calibrating a hysteresis brake to provide a torque of a substantially predetermined value at a predetermined current including the steps of rotating the casing and pole relative to each other to a position which provides substantially the desired torque at the predetermined current, and locking the casing and pole to each other in that position.Type: GrantFiled: July 11, 2000Date of Patent: July 10, 2001Assignee: Magtrol, Inc.Inventor: John E. Duncan
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Patent number: 5400876Abstract: A hysteresis brake including a casing having internal alternating first slots and first teeth, a pole having external alternating second slots and second teeth, a rotor including an annular portion located in spaced relationship between the casing and pole, and structure for permitting the pole and casing to be rotationally adjusted relative to each other and to lock the first slots and teeth of the casing in a rotationally adjusted position relative to the second slots and teeth of the pole to cause the brake to provide a torque output of a substantially predetermined value at a predetermined current. A method of calibrating a hysteresis brake to provide a torque of a substantially predetermined value at a predetermined current including the steps of rotating the casing and pole relative to each other to a position which provides substantially the desired torque at the predetermined current, and locking the casing and pole to each other in that position.Type: GrantFiled: December 16, 1993Date of Patent: March 28, 1995Assignee: Magtrol, Inc.Inventor: John E. Duncan