Patents by Inventor Donald G. Allen

Donald G. Allen 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).

  • Patent number: 10436984
    Abstract: An optical network comprises a fiber distribution cable and a terminal assembly. The terminal assembly receives a plurality of optical fibers from the fiber distribution cable and distributes one or more individual fibers to one or more single fiber bare-fiber holders that hold and protect each single fiber prepared and configured for splicing via an individual splicing element. The splicing element includes an alignment mechanism having a base plate and a clamp plate. At least one of the base plate and clamp plate is formed from a silica material and at least one of the base plate and clamp plate includes an alignment groove or channel configured to receive the first and second optical fibers in an end-to-end manner. The splice element also comprises an optical adhesive disposed in at least a portion of the alignment groove, wherein the optical adhesive is curable via actinic radiation.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: October 8, 2019
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: William J. Clatanoff, Donald K. Larson, Daniel J. Treadwell, William G. Allen, Raman K. Selli, Victor J. Borer, Kathleen M. Humpal, Melissa A. Lackey, Brant U. Kolb, Paul D. Pennington, Mark J. Hendrickson, Wendy L. Thompson, Wayne S. Mahoney
  • Patent number: 9412398
    Abstract: Depositing a seed layer for a high-moment shield onto a write pole may have a deleterious effect on the magnetic response of the write pole. Instead, an amorphous separation layer may be deposited between the write pole and the seed layer. In one embodiment, the seed layer is formed directly on the amorphous layer. In addition to separating the seed layer from the write pole, the amorphous separation layer permits the seed layer to dictate the crystallographic orientation of the shield which is subsequently deposited on the magnetic head. That is, the amorphous layer provides a substrate that allows the seed layer to have a crystalline structure independent of the layers that were deposited previously. The amorphous separation layer may comprise an amorphous metal—e.g., NiNb or NiTa—or an insulative material—e.g., alumina or silicon dioxide.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: August 9, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Donald G. Allen, Wen-Chien D. Hsiao, Quan-chiu H. Lam, Ning Shi
  • Publication number: 20150056473
    Abstract: Depositing a seed layer for a high-moment shield onto a write pole may have a deleterious effect on the magnetic response of the write pole. Instead, an amorphous separation layer may be deposited between the write pole and the seed layer. In one embodiment, the seed layer is formed directly on the amorphous layer. In addition to separating the seed layer from the write pole, the amorphous separation layer permits the seed layer to dictate the crystallographic orientation of the shield which is subsequently deposited on the magnetic head. That is, the amorphous layer provides a substrate that allows the seed layer to have a crystalline structure independent of the layers that were deposited previously. The amorphous separation layer may comprise an amorphous metal—e.g., NiNb or NiTa—or an insulative material—e.g., alumina or silicon dioxide.
    Type: Application
    Filed: August 21, 2013
    Publication date: February 26, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Donald G. Allen, Wen-Chien D. Hsiao, Quan-chiu H. Lam, Ning Shi
  • Patent number: 8547660
    Abstract: A magnetic write head having a tapered trailing edge and having a magnetic layer formed over a trailing edge of the write pole at a location recessed from the ABS, the magnetic layer being separated from the trailing edge of the write pole by a thin non-magnetic layer. The thin non-magnetic layer is preferably sufficiently thin that the magnetic layer can function as a portion of the write pole in a region removed from the ABS. A trailing magnetic shield is formed over the write pole and is separated from the write pole by a non-magnetic trailing gap layer. A non-magnetic spacer layer can be formed over the magnetic layer to provide additional separation between the magnetic layer and the trailing magnetic shield.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: October 1, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Donald G. Allen, Amanda Baer, Yingjian Chen, Andrew Chiu, Liubo Hong, Wen-Chien D. Hsiao, Edward H. P. Lee, Fenglin Liu, Aron Pentek, Katalin Pentek, Kyusik Shin, Yi Zheng, Qiping Zhong, Honglin Zhu
  • Patent number: 8498078
    Abstract: Methods for fabrication of tapered magnetic poles with a non-magnetic front bump layer. A magnetic pole may have a plurality of tapered surfaces at or near an air bearing surface (ABS), wherein a thickness of the write pole increases in a direction away from the ABS. A non-magnetic front bump layer may be formed on one or more of the tapered surfaces of the magnetic pole at a distance from the ABS. The front bump layer may increase the separation distance between a shield layer and the magnetic pole near the tapered surface, thereby improving the performance of the write head.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: July 30, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Donald G. Allen, Liubo Hong, Aron Pentek, Thomas J. A. Roucoux, Sue S. Zhang, Yi Zheng
  • Publication number: 20130082027
    Abstract: A method for manufacturing a magnetic write head for magnetic data recording. The method includes forming a depositing a magnetic write pole material and forming a mask structure over the write pole material that includes a polymer mask under-layer, a dielectric hard mask formed over the polymer mask under-layer and a photoresist mask formed over the dielectric hard mask. The image of the photoresist mask is transferred onto the underlying dielectric hard mask and then a reactive ion etching is performed to transfer the image of the dielectric hard mask onto the polymer mask under-layer. This reactive ion etching is performed in an atmosphere chemistry that includes both an oxygen containing gas and a nitrogen containing gas.
    Type: Application
    Filed: September 30, 2011
    Publication date: April 4, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Guomin Mao, Donald G. Allen, Aron Pentek, Thomas J. A. Roucoux, Yi Zheng
  • Publication number: 20130020204
    Abstract: A method for manufacturing a magnetic write head having a tapered leading edge. The method includes depositing a sacrificial non-magnetic layer to a thickness that is at least as great as the thickness of the write pole to be formed. The sacrificial non-magnetic layer is then masked and ion milled so as to form a tapered edge on the sacrificial non-magnetic layer that extends through the thickness of the non-magnetic fill layer. A magnetic material is then deposited and planarized by chemical mechanical polishing. The remaining magnetic material forms the entirety of the magnetic write pole so that there is no need to deposit additional magnetic layers further construct the write pole.
    Type: Application
    Filed: July 20, 2011
    Publication date: January 24, 2013
    Inventors: Donald G. Allen, Liubo Hong, Aron Pentek, Thomas J. A. Roucoux, Junsheng Yang, Yi Zheng, Qiping Zhong, Honglin Zhu
  • Patent number: 8218263
    Abstract: According to one embodiment, a system comprises an upper yoke having a first length defined between a pole tip thereof and a back gap thereof. In addition, the system includes a lower yoke having a second length defined between a pole tip thereof and a back gap thereof, the second length being greater than the first length. Also, the system includes coil turns in the upper and lower yokes. Additional systems and methods are also presented.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: July 10, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Donald G. Allen, Wen-Chien David Hsiao, Edward Hin Pong Lee, Jennifer Leung, Vladimir Nikitin
  • Publication number: 20120162821
    Abstract: The present disclosure describes various ways to achieve a rotational write field using a single coil. For example, a rotational write field can be achieved with a single coil by using different yoke lengths for different poles of a write element. Also described are ways to achieve a rotational write field with a single coil by varying the resistivity, saturation flux density, or pole width of the different poles of the write element of the present invention. The present disclosure also describes various ways to achieve a rotational write field using varied windings of a single coil.
    Type: Application
    Filed: December 27, 2010
    Publication date: June 28, 2012
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Quan-Chiu Harry Lam, Donald G. Allen, Yansheng Luo
  • Patent number: 8201320
    Abstract: A method for manufacturing a magnetic write head having a leading magnetic shield and a trailing magnetic shield that are arranged to prevent the lost of magnetic write field to the trailing magnetic shield. The write head includes a non-magnetic step layer that provides additional spacing between the trailing magnetic shield and the write pole at a region removed from the air bearing surface.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: June 19, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Donald G. Allen, Yingjian Chen, Andrew Chiu, Liubo Hong, Wen-Chien D. Hsiao, Edward H. P. Lee, Fenglin Liu, Katalin Pentek, Kyusik Shin, Yi Zheng, Qiping Zhong, Honglin Zhu
  • Publication number: 20110146062
    Abstract: A method for manufacturing a magnetic write head having a leading magnetic shield and a trailing magnetic shield that are arranged to prevent the lost of magnetic write field to the trailing magnetic shield. The write head includes a non-magnetic step layer that provides additional spacing between the trailing magnetic shield and the write pole at a region removed from the air bearing surface.
    Type: Application
    Filed: December 17, 2009
    Publication date: June 23, 2011
    Inventors: Donald G. Allen, Yingjian Chen, Andrew Chiu, Liubo Hong, Wen-Chien D. Hsiao, Edward H.P. Lee, Fenglin Liu, Katalin Pentek, Kyusik Shin, Yi Zheng, Qiping Zhong, Honglin Zhu
  • Publication number: 20110151279
    Abstract: A magnetic write head having a tapered trailing edge and having a magnetic layer formed over a trailing edge of the write pole at a location recessed from the ABS, the magnetic layer being separated from the trailing edge of the write pole by a thin non-magnetic layer. The thin non-magnetic layer is preferably sufficiently thin that the magnetic layer can function as a portion of the write pole in a region removed from the ABS. A trailing magnetic shield is formed over the write pole and is separated from the write pole by a non-magnetic trailing gap layer. A non-magnetic spacer layer can be formed over the magnetic layer to provide additional separation between the magnetic layer and the trailing magnetic shield.
    Type: Application
    Filed: December 17, 2009
    Publication date: June 23, 2011
    Inventors: Donald G. Allen, Amanda Baer, Yingjian Chen, Andrew Chiu, Liubo Hong, Wen-Chien D. Hsiao, Edward H.P. Lee, Fenglin Liu, Aron Pentek, Katalin Pentek, Kyusik Shin, Yi Zheng, Qiping Zhong, Honglin Zhu
  • Publication number: 20110134569
    Abstract: Methods for fabrication of tapered magnetic poles with a non-magnetic front bump layer. A magnetic pole may have a plurality of tapered surfaces at or near and air bearing surface (ABS), wherein a thickness of the write pole increases in a direction away from the ABS. A non-magnetic front bump layer may be formed on one or more of the tapered surfaces of the magnetic pole at a distance from the ABS. The front bump layer may increase the separation distance between a shield layer and the magnetic pole near the tapered surface, thereby improving the performance of the write head.
    Type: Application
    Filed: December 9, 2009
    Publication date: June 9, 2011
    Inventors: Donald G. Allen, Liubo Hong, Aron Pentek, Thomas J. A. Roucoux, Sue S. Zhang, Yi Zheng
  • Patent number: 7933096
    Abstract: Methods and structures for the fabrication of both thin film longitudinal and perpendicular write heads are disclosed. A unique feature of these write heads is the inclusion of layered return poles, which comprise alternating layers of 22/78 and 80/20 NiFe alloys. The alternating layers also vary in thickness, the 22/78 NiFe layers having a nominal thickness of 1500 angstroms and the 80/20 NiFe layers having a nominal thickness of about 75 angstroms. Head efficiency and signal to noise ratios are significantly improved in heads having layered return pole construction.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: April 26, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Donald G. Allen, Hieu Lam, Terence Tin-Lok Lam, Steve C. Puga
  • Patent number: 7748103
    Abstract: A perpendicular magnetic recording write head has a write pole, a trapezoidal-shaped trailing shield notch, and a metal gap layer between the write pole and notch. The write pole has a trailing edge that has a width substantially defining the track width and that faces the front edge of the notch but is spaced from it by the gap layer. The write head is fabricated by reactive ion beam etching of a thin mask film above the write pole to remove the mask film and widen the opening at the edges of the write pole. The gap layer and notch are deposited into the widened opening above the write pole. The write pole has nonmagnetic filler material, such as alumina, surrounding it except at its trailing edge, where it is in contact with the gap layer, which is formed of a different material than the surrounding filler material.
    Type: Grant
    Filed: April 24, 2006
    Date of Patent: July 6, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Donald G. Allen, Amanda Baer, Michael Feldbaum, Wen-Chien David Hsiao, Vladimir Nikitin, Aron Pentek, Katalin Pentek
  • Publication number: 20100157471
    Abstract: According to one embodiment, a system comprises an upper yoke having a first length defined between a pole tip thereof and a back gap thereof. In addition, the system includes a lower yoke having a second length defined between a pole tip thereof and a back gap thereof, the second length being greater than the first length. Also, the system includes coil turns in the upper and lower yokes. Additional systems and methods are also presented.
    Type: Application
    Filed: December 22, 2008
    Publication date: June 24, 2010
    Inventors: Donald G. Allen, Wen-Chien David Hsiao, Edward Hin Pong Lee, Jennifer Leung, Vladimir Nikitin
  • Patent number: 7612963
    Abstract: A magnetic recording head for use in perpendicular magnetic recording having a design that allows the write coil to be manufactured by a damascene process for increased coil pitch and reduced coil resistance. The magnetic write head includes a photoresist dam structure that allows a hard baked photoresist to be formed that does not extend to the air bearing surface (ABS). Since the photoresist dam prevents the hard baked photoresist from reaching the ABS, the damascene process, in which the hard baked photoresist remains in the finished write head, can be used to produce the write head. The use of such a damascene process advantageously allows the space between the coil turns to be reduced, which maximizes the number of turns that can be used and also maximizes the number width to which the coil turns can be constructed, thereby minimizing the electrical resistance of the write coil.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: November 3, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Donald G. Allen, Edward Hin Pong Lee, Jennifer Ai-Ming Leung
  • Patent number: 7576951
    Abstract: A magnetic write head for perpendicular magnetic recording having a write pole with a concave trailing edge. The magnetic write pole can have a trapezoidal shape with first and second laterally opposed sides that are further apart at the trailing edge than at the leading edge. The write head may or may not include a magnetic trailing shield, and if a trailing shield is included it is separated from the trailing edge by a non-magnetic write gap layer. The concave trailing edge improves magnetic performance such as by improving the transition curvature. A method for constructing the write head includes forming a magnetic write pole by forming a mask structure over a deposited write pole material, the mask structure having an alumina hard mask and an image transfer layer such as DURAMIDE®. An alumina fill layer is then deposited and a chemical mechanical polish is performed to open up the image transfer layer.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: August 18, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Donald G. Allen, Amanda Baer, Michael Feldbaum, Hung-Chin Guthrie, Wen-Chien David Hsiao, Yimin Hsu, Ming Jiang, Yinshi Liu, Aaron Neuhaus, Vladimir Nikitin, Aron Pentek, Katalin Pentek, Yi Zheng
  • Publication number: 20090168260
    Abstract: Methods and structures for the fabrication of both thin film longitudinal and perpendicular write heads are disclosed. A unique feature of these write heads is the inclusion of layered return poles, which comprise alternating layers of 22/78 and 80/20 NiFe alloys. The alternating layers also vary in thickness, the 22/78 NiFe layers having a nominal thickness of 1500 angstroms and the 80/20 NiFe layers having a nominal thickness of about 75 angstroms. Head efficiency and signal to noise ratios are significantly improved in heads having layered return pole construction.
    Type: Application
    Filed: December 26, 2007
    Publication date: July 2, 2009
    Inventors: Donald G. Allen, Hieu Lam, Terence Tin-Lok Lam, Steve C. Puga
  • Patent number: 7509729
    Abstract: A method for making a write pole in a perpendicular magnetic recording write head uses a metal mask to pattern the primary resist and only ion milling during the subsequent patterning steps. A layer of primary resist is deposited over the magnetic write pole material and a metal mask layer is deposited on the primary resist layer. An imaging resist layer is formed on the metal mask layer and lithographically patterned generally in the desired shape of the write pole. Ion milling without a reactive gas is then performed over the imaging resist pattern to pattern the underlying metal mask layer, which is then used as the mask to define the shape of the primary resist pattern. Ion milling with oxygen is then performed over the metal mask pattern to pattern the underlying primary resist. Ion milling without a reactive gas is then performed over the primary resist pattern to form the underlying write pole.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: March 31, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Donald G. Allen, Amanda Baer, Michael Feldbaum, Hung-Chin Guthrie, Aron Pentek