Patents by Inventor John DiGiovanni
John DiGiovanni 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: 7437046Abstract: An optical transmission fiber is formed to include a relatively low-index, relatively thin outer cladding layer disposed underneath the protective polymer outer coating. Stray light propagating along an inner cladding layer(s) within the fiber will be refracted into the thin outer cladding (by proper selection of refractive index values). The thin dimension of the outer cladding layer allows for the stray light to “leak” into the outer coating in a controlled, gradual manner so as to minimize heating of the coating associated with the presence of stray light. The inventive fiber may also be bent to assist in the movement of stray light into the coating.Type: GrantFiled: February 12, 2007Date of Patent: October 14, 2008Assignee: Furukawa Electric North America, Inc.Inventors: David John DiGiovanni, Yoshihiro Emori, Michael Fishteyn, Clifford Headley
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Publication number: 20080193093Abstract: An optical transmission fiber is formed to include a relatively low-index, relatively thin outer cladding layer disposed underneath the protective polymer outer coating. Stray light propagating along an inner cladding layer(s) within the fiber will be refracted into the thin outer cladding (by proper selection of refractive index values). The thin dimension of the outer cladding layer allows for the stray light to “leak” into the outer coating in a controlled, gradual manner so as to minimize heating of the coating associated with the presence of stray light. The inventive fiber may also be bent to assist in the movement of stray light into the coating.Type: ApplicationFiled: February 12, 2007Publication date: August 14, 2008Inventors: David John DiGiovanni, Yoshihiro Emori, Michael Fishteyn, Clifford Headley
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Publication number: 20080180787Abstract: Optical apparatus includes a multimode, gain-producing fiber for providing gain to signal light propagating in the core of the fiber, and a pump source for providing pump light that is absorbed in the core, characterized in that (i) the pump source illustratively comprises a low brightness array of laser diodes and a converter for increasing the brightness of the pump light, (ii) the pump light is coupled directly into the core, and (iii) the area of the core exceeds approximately 350 ?m2. In one embodiment, the signal light propagates in a single mode, and the pump light co-propagates in at least the same, single mode, both in a standard input fiber before entering the gain-producing fiber, and a mode expander is disposed between the input fiber and the gain-producing fiber. In another embodiment, multiple pumps are coupled into the core of the gain-producing fiber. The pumps may generate light of the same wavelength or of different wavelengths.Type: ApplicationFiled: January 26, 2007Publication date: July 31, 2008Inventors: David John DiGiovanni, Clifford Everill Headley
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Publication number: 20070233189Abstract: A suture anchor is described which in one form may be easily fabricated from extruded material by angular cuts and bore holes which provide an offset pulling force to the suture. In an alternate and preferred embodiment the suture anchor is injection molded having an annular displaced corner and abutment wall which act to seat the suture anchor firmly within a bore hole. Novel application means are also disclosed which hold the suture anchor on a frangible shaft for insertion and upon completion of the insertion permit fracture of the frangible portion and removal of the instrument.Type: ApplicationFiled: June 13, 2007Publication date: October 4, 2007Applicant: DePuy Mitek, Inc.Inventors: Jack Pedlick, Thu Le, John DiGiovanni, Dennis Jamiolkowski, Mark Suseck
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Patent number: 7232455Abstract: A suture anchor is described which in one form may be easily fabricated from extruded material by angular cuts and bore holes which provide an offset pulling force to the suture. In an alternate and preferred embodiment the suture anchor is injection molded having an annular displaced corner and abutment wall which act to seat the suture anchor firmly within a bore hole. Novel application means are also disclosed which hold the suture anchor on a frangible shaft for insertion and upon completion of the insertion permit fracture of the frangible portion and removal of the instrument.Type: GrantFiled: May 26, 2004Date of Patent: June 19, 2007Assignee: DePuy Mitek, Inc.Inventors: Jack S. Pedlick, Thu Anh Le, John DiGiovanni, Dennis D. Jamiolkowski, Mark J. Suseck
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Patent number: 7043128Abstract: The specification describes a technique for drawing circular core multimode optical fiber using twist during draw to increase fiber bandwidth.Type: GrantFiled: February 25, 2004Date of Patent: May 9, 2006Assignee: Furukawa Electric North AmericaInventors: David John DiGiovanni, Frank Vincent DiMarcello, XinLi Jiang, George E. Oulundsen, Sandeep Prabhakar Pandit
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Patent number: 6966201Abstract: Techniques are described for fabricating a preform from a soot body. In one described technique, a soot body is loaded into a substrate tube, and the position of the soot body is stabilized within the tube. The tube is then rotated around its longitudinal axis. Heat is applied from a heat source to the substrate tube at a first end of the soot body to cause the first end of the soot body to begin to sinter and to cause the substrate tube to begin to at least partially collapse around the sintered portion of the soot body. The heat source is then advanced along the substrate tube and the soot body to cause a progressive sintering of the soot body, and to cause a progressive, at least partial, collapse of the substrate tube around the sintered portion of the soot body.Type: GrantFiled: August 16, 2002Date of Patent: November 22, 2005Assignee: Furukawa Electric North America, Inc.Inventors: David John DiGiovanni, Kyunghwan Oh
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Patent number: 6899470Abstract: Systems and techniques are described for fabricating a low-loss, high-strength optical transmission line. In one described technique, a first fiber is spliced to a second fiber at a splice point. The spliced fibers are loaded into a heat treatment station, where a gas torch flame is used to thermally treat a splice region including the splice point, with the thermal treatment reducing splice loss between the first and second fibers. While heating the splice region, a dry gas is purged around the torch flame during the heat treatment process to avoid water at the surface of the spliced fibers. According to further described techniques, a purging gas is fed to the torch flame to purge dust particles from the flame, and after the heat treatment has been completed, the torch flame is used to restore the glass surface of the spliced fibers. Additionally described are torch assemblies for fabricating low-loss, high-strength optical fiber transmission lines.Type: GrantFiled: July 17, 2002Date of Patent: May 31, 2005Assignee: Fitel USA Corp.Inventors: David John DiGiovanni, Torben E. Veng
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Patent number: 6826341Abstract: Optical fibers are described that exhibit reduced splice loss. Further described are techniques for fabricating optical fibers exhibiting reduced splice loss. One described fiber includes a plurality of regions, one region having a higher viscosity and the other region having a lower viscosity, such that when the fiber is drawn under tension, a strain is frozen into the higher viscosity region. A lower viscosity buffer layer is sandwiched between the higher viscosity region and the lower viscosity region. The buffer layer isolates the lower viscosity region from changes in refractive index in the higher viscosity region arising from a change in the strain frozen into the higher viscosity region.Type: GrantFiled: November 4, 2002Date of Patent: November 30, 2004Assignee: Fitel USA Corp.Inventors: David John DiGiovanni, Peter Mikal Holmblad, Torben E. Veng, Andrew D. Yablon
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Publication number: 20040228590Abstract: The specification describes a technique for drawing circular core multimode optical fiber using twist during draw to increase fiber bandwidth.Type: ApplicationFiled: February 25, 2004Publication date: November 18, 2004Inventors: David John DiGiovanni, Frank Vincent DiMarcello, XinLi Jiang, George E. Oulundsen, Sandeep Prabhakar Pandit
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Publication number: 20040220617Abstract: A suture anchor is described which in one form may be easily fabricated from extruded material by angular cuts and bore holes which provide an offset pulling force to the suture. In an alternate and preferred embodiment the suture anchor is injection molded having an annular displaced corner and abutment wall which act to seat the suture anchor firmly within a bore hole. Novel application means are also disclosed which hold the suture anchor on a frangible shaft for insertion and upon completion of the insertion permit fracture of the frangible portion and removal of the instrument.Type: ApplicationFiled: May 26, 2004Publication date: November 4, 2004Applicant: Mitek Surgical Products, Inc.Inventors: Jack S. Pedlick, Thu Anh Le, John DiGiovanni, Dennis D. Jamiolkowski, Mark J. Suseck
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Patent number: 6785472Abstract: A fiber-optic WDM ring carries communication traffic among a plurality of nodes, each node associated with respective subscriber premises. Remote gain is provided in at least one link of the ring. In specific embodiments of the invention, the remote gain is applied preferentially to those wavelength channels most in need of amplification. In specific embodiments of the invention, the remote gain is Raman gain.Type: GrantFiled: June 15, 1999Date of Patent: August 31, 2004Assignee: Lucent Technologies Inc.Inventors: Laura Ellen Adams, Jon Anderson, Robert Mario Broberg, David John DiGiovanni, Karsten Rottwitt
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Publication number: 20040167576Abstract: A suture anchor is described which in one form may be easily fabricated from extruded material by angular cuts and bore holes which provide an offset pulling force to the suture. In an alternate and preferred embodiment the suture anchor is injection molded having an annular displaced corner and abutment wall which act to seat the suture anchor firmly within a bore hole. Novel application means are also disclosed which hold the suture anchor on a frangible shaft for insertion and upon completion of the insertion permit fracture of the frangible portion and removal of the instrument.Type: ApplicationFiled: February 19, 2004Publication date: August 26, 2004Applicant: Mitek Surgical Products, Inc.Inventors: Jack S. Pedlick, Thu Anh Le, John DiGiovanni, Dennis D. Jamiolkowski, Mark J. Suseck
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Patent number: 6768849Abstract: Systems and methods are described for fabricating a varying-waveguide optical fiber. In one described method, a preform is fabricated having a core and at least one cladding region. The cladding region has a higher viscosity and the core region has a lower viscosity. The relative viscosities of the cladding region and core are chosen such that, when tension is applied to an optical fiber drawn from the preform, the applied tension is primarily borne by the cladding region thereby causing a viscoelastic strain to be frozen into the cladding region, while creating a minimal viscoelastic strain in the core. The method further includes drawing the preform into an optical fiber under an applied tension, such that a viscoelastic strain is frozen into the cladding region the frozen-in viscoelastic strain decreasing the cladding region refractive index.Type: GrantFiled: July 3, 2002Date of Patent: July 27, 2004Assignee: Fitel USA Corp.Inventors: David John DiGiovanni, Andrew D. Yablon, Man Fei Yan
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Patent number: 6768847Abstract: A dispersion compensating fiber and module are described for controlling residual dispersion in a dispersion compensated system. The dispersion compensating fiber is designed with dispersion curve having an inflection point at a wavelength near the optical transmission operating wavelength region. The dispersion curve, having an inflection point near the operating wavelength region, produces a relative dispersion slope that closely matches the relative dispersion slope of the transmission fiber over a relatively wide bandwidth surrounding the operating wavelength region.Type: GrantFiled: March 15, 2002Date of Patent: July 27, 2004Assignee: Fitel USA Corp.Inventors: David John DiGiovanni, William A. Reed, Man F. Yan, Lars Gruner-Nielsen, Susanne Dyrbol
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Patent number: 6735985Abstract: The specification describes a technique for drawing circular core multimode optical fiber using twist during draw to increase fiber bandwidth.Type: GrantFiled: December 20, 2001Date of Patent: May 18, 2004Assignee: Furukawa Electric North America IncInventors: David John DiGiovanni, Frank Vincent DiMarcello, XinLi Jiang, George E. Oulundsen, Sandeep Prabhakar Pandit
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Publication number: 20040086243Abstract: Optical fibers are described that exhibit reduced splice loss. Further described are techniques for fabricating optical fibers exhibiting reduced splice loss. One described fiber includes a plurality of regions, one region having a higher viscosity and the other region having a lower viscosity, such that when the fiber is drawn under tension, a strain is frozen into the higher viscosity region. A lower viscosity buffer layer is sandwiched between the higher viscosity region and the lower viscosity region. The buffer layer isolates the lower viscosity region from changes in refractive index in the higher viscosity region arising from a change in the strain frozen into the higher viscosity region.Type: ApplicationFiled: November 4, 2002Publication date: May 6, 2004Applicant: Fitel USA Corp.Inventors: David John DiGiovanni, Peter Mikal Holmblad, Torben E. Veng, Andrew D. Yablon
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Patent number: 6726707Abstract: A suture anchor is described which in one form may be easily fabricated from extruded material by angular cuts and bore holes which provide an offset pulling force to the suture. In an alternate and preferred embodiment the suture anchor is injection molded having an annular displaced corner and abutment wall which act to seat the suture anchor firmly within a bore hole. Novel application means are also disclosed which hold the suture anchor on a frangible shaft for insertion and upon completion of the insertion permit fracture of the frangible portion and removal of the instrument.Type: GrantFiled: August 7, 2001Date of Patent: April 27, 2004Assignee: Mitek Surgical Products Inc.Inventors: Jack S. Pedlick, Thu Anh Le, John DiGiovanni, Dennis D. Jamiolkowski, Mark J. Suseck
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Publication number: 20040031290Abstract: Techniques are described for fabricating a preform from a soot body. In one described technique, a soot body is loaded into a substrate tube, and the position of the soot body is stabilized within the tube. The tube is then rotated around its longitudinal axis. Heat is applied from a heat source to the substrate tube at a first end of the soot body to cause the first end of the soot body to begin to sinter and to cause the substrate tube to begin to at least partially collapse around the sintered portion of the soot body. The heat source is then advanced along the substrate tube and the soot body to cause a progressive sintering of the soot body, and to cause a progressive, at least partial, collapse of the substrate tube around the sintered portion of the soot body.Type: ApplicationFiled: August 16, 2002Publication date: February 19, 2004Applicant: Fitel USA Corp.Inventors: David John DiGiovanni, Kyunghwan Oh
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Publication number: 20040013374Abstract: Systems and techniques are described for fabricating a low-loss, high-strength optical transmission line. In one described technique, a first fiber is spliced to a second fiber at a splice point. The spliced fibers are loaded into a heat treatment station, where a gas torch flame is used to thermally treat a splice region including the splice point, with the thermal treatment reducing splice loss between the first and second fibers. While heating the splice region, a dry gas is purged around the torch flame during the heat treatment process to avoid water at the surface of the spliced fibers. According to further described techniques, a purging gas is fed to the torch flame to purge dust particles from the flame, and after the heat treatment has been completed, the torch flame is used to restore the glass surface of the spliced fibers. Additionally described are torch assemblies for fabricating low-loss, high-strength optical fiber transmission lines.Type: ApplicationFiled: July 17, 2002Publication date: January 22, 2004Applicant: Fitel USA Corp.Inventors: David John DiGiovanni, Torben E. Veng