Patents by Inventor S. Riaz U L Hasan

S. Riaz U L Hasan 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).

  • Method for selectively hardening a carbon steel screw
    Patent number: 6364972
    Abstract: A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one embodiment, an upper portion of the screw head is selectively hardened to prevent or reduce damage when torque is applied using a driving tool. In another embodiment, the screw tip is selectively hardened for more effective penetration into a substrate. Preferably, the selectively heated portions are selectively quenched to reduce or avoid distortion.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: April 2, 2002
    Assignee: Illinois Tool Works Inc.
    Inventors: Mark D. Bauer, William A. Spring, Michael Starozhitsky, S. Riaz U L Hasan
  • Screws having selected heat treatment and hardening
    Patent number: 6109851
    Abstract: A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one embodiment, an upper portion of the screw head is selectively hardened to prevent or reduce damage when torque is applied using a driving tool. In another embodiment, the screw tip is selectively hardened for more effective penetration into a substrate. Preferably, the selectively heated portions are selectively quenched to reduce or avoid distortion.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: August 29, 2000
    Assignee: Illinois Tool Works Inc.
    Inventors: Mark D. Bauer, William A. Spring, Michael Starozhitsky, S. Riaz U L Hasan