Patents by Inventor Ravi Kanth Kolan

Ravi Kanth Kolan 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: 9704726
    Abstract: A structural member for use in semiconductor packaging is disclosed. The structural member includes a plurality of packaging regions to facilitate packaging dies in, for example, a wafer format. A packaging region has a die attach region surrounded by a peripheral region. A die is attached to the die attach region. In one aspect, the die attach region has opening through the surfaces of the structural member for accommodating a die. Through-vias disposed are in the peripheral regions. The structural member reduces warpage that can occur during curing of the mold compound used in encapsulating the dies. In another aspect, the die attach region does not have an opening. In such cases, the structural member serves as an interposer between the die and a substrate.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: July 11, 2017
    Assignee: UTAC HEADQUARTERS PTE. LTD.
    Inventors: Chin Hock Toh, Yi Sheng Anthony Sun, Xue Ren Zhang, Ravi Kanth Kolan
  • Publication number: 20160005629
    Abstract: A structural member for use in semiconductor packaging is disclosed. The structural member includes a plurality of packaging regions to facilitate packaging dies in, for example, a wafer format. A packaging region has a die attach region surrounded by a peripheral region. A die is attached to the die attach region. In one aspect, the die attach region has opening through the surfaces of the structural member for accommodating a die. Through-vias disposed are in the peripheral regions. The structural member reduces warpage that can occur during curing of the mold compound used in encapsulating the dies. In another aspect, the die attach region does not have an opening. In such cases, the structural member serves as an interposer between the die and a substrate.
    Type: Application
    Filed: September 18, 2015
    Publication date: January 7, 2016
    Inventors: Chin Hock TOH, Yi Sheng Anthony SUN, Xue Ren ZHANG, Ravi Kanth KOLAN
  • Patent number: 9142487
    Abstract: A structural member for use in semiconductor packaging is disclosed. The structural member includes a plurality of packaging regions to facilitate packaging dies in, for example, a wafer format. A packaging region has a die attach region surrounded by a peripheral region. A die is attached to the die attach region. In one aspect, the die attach region has opening through the surfaces of the structural member for accommodating a die. Through-vias disposed are in the peripheral regions. The structural member reduces warpage that can occur during curing of the mold compound used in encapsulating the dies. In another aspect, the die attach region does not have an opening. In such cases, the structural member serves as an interposer between the die and a substrate.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: September 22, 2015
    Assignee: UNITED TEST AND ASSEMBLY CENTER LTD.
    Inventors: Chin Hock Toh, Yi Sheng Anthony Sun, Xue Ren Zhang, Ravi Kanth Kolan
  • Patent number: 8772921
    Abstract: An interposer is presented. The interposer includes an interposer base having first and second surfaces. A redistribution layer is disposed on a first surface of the interposer base. The interposer has at least one interposer pad coupled to the redistribution layer. It also includes at least one interposer contact on the second surface. The interposer contact is electrically coupled to the interposer pad via the redistribution layer. The interposer also includes at least one interposer via through the interposer base for coupling the interposer contact to the redistribution layer. The interposer via includes reflowed conductive material of the interposer contact.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: July 8, 2014
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Chin Hock Toh, Yao Huang Huang, Ravi Kanth Kolan, Wei Liang Yuan, Susanto Tanary, Yi Sheng Anthony Sun
  • Patent number: 8741762
    Abstract: A method for preparing a die for packaging is disclosed. A die having first and second major surfaces is provided. Vias and a mask layer are formed on the first major surface of the die. The mask includes mask openings that expose the vias. The mask openings are filled with a conductive material. The method includes reflowing to at least partially fill the vias and contact openings to form via contacts in the vias and surface contacts in the mask openings.
    Type: Grant
    Filed: October 21, 2013
    Date of Patent: June 3, 2014
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Hao Liu, Yi Sheng Anthony Sun, Ravi Kanth Kolan, Chin Hock Toh
  • Publication number: 20140045301
    Abstract: A method for preparing a die for packaging is disclosed. A die having first and second major surfaces is provided. Vias and a mask layer are formed on the first major surface of the die. The mask includes mask openings that expose the vias. The mask openings are filled with a conductive material. The method includes reflowing to at least partially fill the vias and contact openings to form via contacts in the vias and surface contacts in the mask openings.
    Type: Application
    Filed: October 21, 2013
    Publication date: February 13, 2014
    Applicant: United Test and Assembly Center Ltd.
    Inventors: Hao LIU, Yi Sheng Anthony SUN, Ravi Kanth KOLAN, Chin Hock TOH
  • Patent number: 8586465
    Abstract: A method for preparing a die for packaging is disclosed. A die having first and second major surfaces is provided. Vias and a mask layer are formed on the first major surface of the die. The mask includes mask openings that expose the vias. The mask openings are filled with a conductive material. The method includes reflowing to at least partially fill the vias and contact openings to form via contacts in the vias and surface contacts in the mask openings.
    Type: Grant
    Filed: June 5, 2008
    Date of Patent: November 19, 2013
    Assignee: United Test and Assembly Center Ltd
    Inventors: Hao Liu, Yi Sheng Anthony Sun, Ravi Kanth Kolan, Chin Hock Toh
  • Patent number: 8426246
    Abstract: A die that includes a substrate having a first and second major surface is disclosed. The die has at least one unfilled through via passing through the major surfaces of the substrate. The unfilled through via serves as a vent to release pressure generated during assembly.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: April 23, 2013
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Chin Hock Toh, Hao Liu, Ravi Kanth Kolan
  • Patent number: 8399985
    Abstract: A chip package includes a carrier having a first and a second major surface. The first major surface includes an active region surrounded by an inactive region. The chip package includes contact pads in the active region for mating with chip contacts of a chip. A support structure is disposed on the inactive region of the first major surface. The support structure forms a dam that surrounds the active region. When a chip or chip stack is mounted in the active region, spacing exists between the dam and the chip or chip stack. The spacing creates convention paths for heat dissipation.
    Type: Grant
    Filed: September 25, 2011
    Date of Patent: March 19, 2013
    Assignee: United Test And Assembly Center Ltd.
    Inventors: Ravi Kanth Kolan, Hao Liu, Chin Hock Toh
  • Patent number: 8384203
    Abstract: A structural member for use in semiconductor packaging is disclosed. The structural member includes a plurality of packaging regions to facilitate packaging dies in, for example, a wafer format. A packaging region has a die attach region surrounded by a peripheral region. A die is attached to the die attach region. In one aspect, the die attach region has opening through the surfaces of the structural member for accommodating a die. Through-vias disposed are in the peripheral regions. The structural member reduces warpage that can occur during curing of the mold compound used in encapsulating the dies. In another aspect, the die attach region does not have an opening. In such cases, the structural member serves as an interposer between the die and a substrate.
    Type: Grant
    Filed: July 20, 2009
    Date of Patent: February 26, 2013
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Chin Hock Toh, Yi Sheng Anthony Sun, Xue Ren Zhang, Ravi Kanth Kolan
  • Publication number: 20120149150
    Abstract: A die that includes a substrate having a first and second major surface is disclosed. The die has at least one unfilled through via passing through the major surfaces of the substrate. The unfilled through via serves as a vent to release pressure generated during assembly.
    Type: Application
    Filed: February 21, 2012
    Publication date: June 14, 2012
    Applicant: UNITED TEST AND ASSEMBLY CENTER LTD.
    Inventors: Chin Hock TOH, Hao LIU, Ravi Kanth KOLAN
  • Publication number: 20120104628
    Abstract: An interposer is presented. The interposer includes an interposer base having first and second surfaces. A redistribution layer is disposed on a first surface of the interposer base. The interposer has at least one interposer pad coupled to the redistribution layer. It also includes at least one interposer contact on the second surface. The interposer contact is electrically coupled to the interposer pad via the redistribution layer. The interposer also includes at least one interposer via through the interposer base for coupling the interposer contact to the redistribution layer. The interposer via includes reflowed conductive material of the interposer contact.
    Type: Application
    Filed: January 10, 2012
    Publication date: May 3, 2012
    Applicant: UNITED TEST AND ASSEMBLY CENTER LTD.
    Inventors: Chin Hock TOH, Yao Huang HUANG, Ravi Kanth KOLAN, Wei Liang YUAN, Susanto TANARY, Yi Sheng Anthony SUN
  • Patent number: 8143719
    Abstract: A die that includes a substrate having a first and second major surface is disclosed. The die has at least one unfilled through via passing through the major surfaces of the substrate. The unfilled through via serves as a vent to release pressure generated during assembly.
    Type: Grant
    Filed: June 5, 2008
    Date of Patent: March 27, 2012
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Chin Hock Toh, Hao Liu, Ravi Kanth Kolan
  • Patent number: 8115292
    Abstract: An interposer is presented. The interposer includes an interposer base having first and second surfaces. A redistribution layer is disposed on a first surface of the interposer base. The interposer has at least one interposer pad coupled to the redistribution layer. It also includes at least one interposer contact on the second surface. The interposer contact is electrically coupled to the interposer pad via the redistribution layer. The interposer also includes at least one interposer via through the interposer base for coupling the interposer contact to the redistribution layer. The interposer via includes reflowed conductive material of the interposer contact.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: February 14, 2012
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Chin Hock Toh, Yao Huang Huang, Ravi Kanth Kolan, Wei Liang Yuan, Susanto Tanary, Anthony Yi Sheng Sun
  • Publication number: 20120018869
    Abstract: A chip package includes a carrier having a first and a second major surface. The first major surface includes an active region surrounded by an inactive region. The chip package includes contact pads in the active region for mating with chip contacts of a chip. A support structure is disposed on the inactive region of the first major surface. The support structure forms a dam that surrounds the active region. When a chip or chip stack is mounted in the active region, spacing exists between the dam and the chip or chip stack. The spacing creates convention paths for heat dissipation.
    Type: Application
    Filed: September 25, 2011
    Publication date: January 26, 2012
    Applicant: UNITED TEST AND ASSEMBLY CENTER LTD.
    Inventors: Ravi Kanth KOLAN, Hao LIU, Chin Hock TOH
  • Patent number: 8030761
    Abstract: A chip package includes a carrier having a first and a second major surface. The first major surface includes an active region surrounded by an inactive region. The chip package includes contact pads in the active region for mating with chip contacts of a chip. A support structure is disposed on the inactive region of the first major surface. The support structure forms a dam that surrounds the active region. When a chip or chip stack is mounted in the active region, spacing exists between the dam and the chip or chip stack. The spacing creates convention paths for heat dissipation.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: October 4, 2011
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Ravi Kanth Kolan, Hao Liu, Chin Hock Toh
  • Patent number: 7883938
    Abstract: A method of manufacturing a plurality of stacked die semiconductor packages, including: attaching a second silicon wafer to a first silicon wafer, wherein the second silicon wafer has a plurality of open vias; attaching a third silicon wafer to the second silicon wafer, wherein the third silicon wafer has a plurality of open vias, and the open vias of the second and third silicon wafers are aligned with one another; etching a bonding material that attaches the wafers from the aligned open vias; filling the aligned open vias with a conductor; forming conductive bumps at open ends of the aligned open vias; back grinding the first silicon wafer; separating the stacked semiconductor dies from each other; attaching the bump end of the stacked semiconductor dies onto a substrate; encapsulating the stacked semiconductor dies and substrate; and singulating the encapsulated assembly.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: February 8, 2011
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Ravi Kanth Kolan, Anthony Sun Yi Sheng, Liu Hao, Toh Chin Hock
  • Patent number: 7830006
    Abstract: A chip scale integrated circuit package includes an integrated circuit chip which has a first face and a second face. A plurality of pillar bumps are formed on the first face of the integrated circuit chip. An encapsulant material encapsulates the sides and the first face of the integrated circuit chip, and the pillar bumps. Upper ends of the pillar bumps remain free from encapsulant material and a substantially planar surface is formed by an upper surface of the encapsulant material and the upper ends of the pillar bumps. A plurality of solder balls are mounted on the substantially planar surface in locations corresponding to the upper ends of the pillar bumps.
    Type: Grant
    Filed: May 5, 2005
    Date of Patent: November 9, 2010
    Assignee: United Test and Assembly Center, Ltd.
    Inventors: Ravi Kanth Kolan, Hien Boon Tan, Anthony Yi Sheng Sun, Beng Kuan Lim, Krishnamoorthi Sivalingam
  • Patent number: 7824960
    Abstract: A method of manufacturing a plurality of stacked die semiconductor packages, including: placing a phase change material between a top surface of a substrate and a bottom surface of a first die; placing a phase change material between a top surface of the first die and a bottom surface of a second die; wherein the first and second dies have a plurality of conductive protrusions on the bottom surfaces of the dies; wherein the first die has a plurality of conductive vias extending from its conductive protrusions, through the first die, to the top surface of the first die; wherein the conductive vias of said first die are in alignment with the conductive protrusions of the second die; and heating the dies and the substrate to cause the second die to become electrically interconnected to the first die and the first die to become electrically connected to the substrate.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: November 2, 2010
    Assignee: United Test and Assembly Center Ltd.
    Inventors: Liu Hao, Ravi Kanth Kolan
  • Publication number: 20100109142
    Abstract: An interposer is presented. The interposer includes an interposer base having first and second surfaces. A redistribution layer is disposed on a first surface of the interposer base. The interposer has at least one interposer pad coupled to the redistribution layer. It also includes at least one interposer contact on the second surface. The interposer contact is electrically coupled to the interposer pad via the redistribution layer. The interposer also includes at least one interposer via through the interposer base for coupling the interposer contact to the redistribution layer. The interposer via includes reflowed conductive material of the interposer contact.
    Type: Application
    Filed: October 23, 2009
    Publication date: May 6, 2010
    Applicant: UNITED TEST AND ASSEMBLY CENTER LTD.
    Inventors: Chin Hock Toh, Yao Huang Huang, Ravi Kanth Kolan, Wei Liang Yuan, Susanto Tanary, Yi Sheng Anthony Sun