Patents by Inventor Stephen Helesfai

Stephen Helesfai 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).

  • Tumbler wheel structure for radiological detector resistant combination lock
    Patent number: 4803859
    Abstract: A combination lock of the type adapted for changing of the combination by a change key, a lock case housing, a stack of a plurality of tumbler wheels loosely journaled on a tumbler post for rotation about its axis and each including an annular outer rim portion and an inner annular hub portion having teeth releasably intercoupling the hub portion and rim portion at any of a plurality of relative angular positions. The rim portions of the tumbler wheels have specially shaped peripheral gates to receive confronting portions of a fence on the fence lever when the tumbler wheels are properly aligned. The tumbler post is supported within the tumbler wheel hub portions for nonrotatable axial movement to shift the hub portions axially relative to the outer rim portions between coupled and decoupled relation.
    Type: Grant
    Filed: February 5, 1988
    Date of Patent: February 14, 1989
    Inventors: Harry C. Miller, Stephen Helesfai
  • Radiological detection resistant combination lock
    Patent number: 4796446
    Abstract: A combination lock of the type adapted for changing of the combination by a change key, a lock case housing, a stack of a plurality of tumbler wheels loosely journaled on a tumbler post for rotation about its axis and each including an annular outer rim portion and an inner annular hub portion having teeth releasably intercoupling the hub portion and rim portion at any of a plurality of relative angular positions. The rim portions of the tumbler wheels have specially shaped peripheral gates to receive confronting portions of a fence on the fence lever when the tumbler wheels are properly aligned. The tumbler post is supported within the tumbler wheel hub portions for nonrotatable axial movement to shift the hub portions axially relative to the outer rim portions between coupled and decoupled relation.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: January 10, 1989
    Inventors: Harry C. Miller, Stephen Helesfai
  • Radiological detection resistant key changeable combination lock
    Patent number: 4776190
    Abstract: A combination lock of the type adapted for changing of the combination by a change key, a lock case housing, a stack of a plurality of tumbler wheels loosely journaled on a tumbler post for rotation about its axis and each including an annular outer rim portion and an inner annular hub portion having teeth releasably intercoupling the hub portion and rim portion at any of a plurality of relative angular positions. The rim portions of the tumbler wheels have specially shaped peripheral gates to receive confronting portions of a fence on the fence lever when the tumbler wheels are properly aligned. The tumbler post is supported within the tumbler wheel hub portions for nonrotatable axial movement to shift the hub portions axially relative to the outer rim portions between coupled and decoupled relation.
    Type: Grant
    Filed: January 22, 1987
    Date of Patent: October 11, 1988
    Assignee: Sargent & Greenleaf, Inc.
    Inventors: Harry C. Miller, Stephen Helesfai, John R. Bishop, Gregory Lainhart