Patents by Inventor Aly Dayem

Aly Dayem 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).

  • Charged particle energy filter
    Patent number: 4742224
    Abstract: An ion energy filter of the type useful in connection with secondary ion mass spectrometry is disclosed. The filter is composed of a stack of 20 thin metal plates, each plate being insulated from the others and having a centrally located hole with a unique radius. A metallic hemisphere is mounted on a base plate, and the 20 thin metal plates are attached to the base plate such that the plate with the smallest central hole is adjacent to the base plate and the radii of the holes in subsequent plates increase with increasing distance from the base plate. The relative potential of each plate is determined by a series string of 20 resistors with each plate being connected to a different junction in the series string. The radii of the centrally located holes are selected such that the voltage on each plate is inversely proportional to the radius of its centrally located hole.
    Type: Grant
    Filed: December 22, 1986
    Date of Patent: May 3, 1988
    Assignee: American Telephone and Telegraph Company AT&T Bell Laboratories
    Inventors: Steven Chu, Aly Dayem, Eric H. Westerwick