Patents by Inventor Mohanraj Soundarapandian

Mohanraj Soundarapandian 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: 7381629
    Abstract: A substrate having target transfer regions thereon is provided. A sacrificial wafer is coated with a polymer layer with low adhesion to metals. A conductive layer is coated on the polymer layer and covered with a photoresist layer which is patterned to provide openings to the conductive layer. Thin film and passive or active device structures are formed on the conductive layer within the openings. The substrate is bonded to the sacrificial wafer wherein the thin film and passive or active device structures and the photoresist layer provide the bonding and wherein the thin film and passive or active device structures contact the substrate at the target transfer regions. The photoresist is stripped in a high frequency agitation bath wherein the photoresist separates from the sacrificial wafer and wherein the thin film and passive or active device structures separate from the polymer layer to complete transfer bonding.
    Type: Grant
    Filed: February 12, 2007
    Date of Patent: June 3, 2008
    Assignee: Agency for Science, Technology and Research
    Inventors: Chirayarikathuveedu Premachandran Sankarapillai, Ranganathan Nagarajan, Mohanraj Soundarapandian
  • Publication number: 20070141804
    Abstract: A substrate having target transfer regions thereon is provided. A sacrificial wafer is coated with a polymer layer with low adhesion to metals. A conductive layer is coated on the polymer layer and covered with a photoresist layer which is patterned to provide openings to the conductive layer. Thin film and passive or active device structures are formed on the conductive layer within the openings. The substrate is bonded to the sacrificial wafer wherein the thin film and passive or active device structures and the photoresist layer provide the bonding and wherein the thin film and passive or active device structures contact the substrate at the target transfer regions. The photoresist is stripped in a high frequency agitation bath wherein the photoresist separates from the sacrificial wafer and wherein the thin film and passive or active device structures separate from the polymer layer to complete transfer bonding.
    Type: Application
    Filed: February 12, 2007
    Publication date: June 21, 2007
    Inventors: Chirayarikathuveedu Sankarapillai, Ranganathan Nagarajan, Mohanraj Soundarapandian
  • Patent number: 7183176
    Abstract: A wafer is provided having through-holes therein to form a through-hole via wafer. A substrate of a sacrificial wafer is provided. The substrate is coated with a polymer having low adhesion to metals. A conductive layer is deposited on the polymer. A photoresist layer is coated on the conductive layer. The through-hole via wafer is bonded to the sacrificial wafer wherein the photoresist layer provides the bonding. The photoresist exposed in the through-holes is developed away to expose the conductive layer. The through-holes are filled with a conductive material by electroplating the conductive layer. The photoresist is stripped in an ultrasonic bath wherein the photoresist separates from the through-hole wafer and wherein the filled through-holes separate from the polymer at an interface between the polymer and the conductive layer to complete separation of the through-hole via wafer from the sacrificial wafer.
    Type: Grant
    Filed: August 25, 2004
    Date of Patent: February 27, 2007
    Assignee: Agency for Science, Technology and Research
    Inventors: Chirayarikathuveedu Premachandran Sankarapillai, Ranganathan Nagarajan, Mohanraj Soundarapandian
  • Publication number: 20060046432
    Abstract: A wafer is provided having through-holes therein to form a through-hole via wafer. A substrate of a sacrificial wafer is provided. The substrate is coated with a polymer having low adhesion to metals. A conductive layer is deposited on the polymer. A photoresist layer is coated on the conductive layer. The through-hole via wafer is bonded to the sacrificial wafer wherein the photoresist layer provides the bonding. The photoresist exposed in the through-holes is developed away to expose the conductive layer. The through-holes are filled with a conductive material by electroplating the conductive layer. The photoresist is stripped in an ultrasonic bath wherein the photoresist separates from the through-hole wafer and wherein the filled through-holes separate from the polymer at an interface between the polymer and the conductive layer to complete separation of the through-hole via wafer from the sacrificial wafer.
    Type: Application
    Filed: August 25, 2004
    Publication date: March 2, 2006
    Inventors: Chirayarikathuveedu Sankarapillai, Ranganathan Nagarajan, Mohanraj Soundarapandian