Patents by Inventor Ramachandra Divkaruni

Ramachandra Divkaruni 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).

  • DRAM cell with buried collar and self-aligned buried strap
    Patent number: 6974991
    Abstract: In a DRAM cell having a trench, a cell capacitor and a cell transistor, a node conducting element connects the cell capacitor to the cell transistor and a collar is disposed about the node conducting element. The collar is disposed in the substrate at least partially, up to entirely outside of the trench. Because the collar is disposed in the substrate outside of the trench, it does not restrict the size of the trench opening. This enables sub-100 nm trenches, using techniques which are compatible with contemporary DRAM process steps. A strap is embedded into a top surface of the collar.
    Type: Grant
    Filed: October 29, 2003
    Date of Patent: December 13, 2005
    Assignee: International Business Machines Corp.
    Inventors: Kangguo Cheng, Ramachandra Divkaruni, Gary Bela Bronner, Carl John Radens, Oleg G. Gluschenkov
  • DRAM cell with buried collar and self-aligned buried strap
    Publication number: 20050093044
    Abstract: In a DRAM cell having a trench, a cell capacitor and a cell transistor, a node conducting element connects the cell capacitor to the cell transistor and a collar is disposed about the node conducting element. The collar is disposed in the substrate at least partially, up to entirely outside of the trench. Because the collar is disposed in the substrate outside of the trench, it does not restrict the size of the trench opening. This enables sub-100 nm trenches, using techniques which are compatible with contemporary DRAM process steps. A strap is embedded into a top surface of the collar.
    Type: Application
    Filed: October 29, 2003
    Publication date: May 5, 2005
    Inventors: Kangguo Cheng, Ramachandra Divkaruni, Gary Bronner, Carl Radens, Oleg Gluschenkov