The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 1992
Filed:
Aug. 31, 1989
Applicant:
Inventors:
Paul S Da Lin, Middletown, NJ (US);
Zhifeng Shao, Charlottesville, VA (US);
Assignees:
Bell Communications Research, Inc., Livingston, NJ (US);
Arch Development Corp., Chicago, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2503 / ; 2503 / ; 250398 ;
Abstract
A magnetic electron focusing lens including a first pole piece, from a back side of which low-energy electrons are injected, and a second pole piece located on a front side of the first pole piece. The first and second pole pieces are coupled to form a single magnetic circuit. The first pole piece is shaped to maximize the magnetic field at a its front side at a peak much closer to the first then to the second pole piece. The specimen is located between the first and second pole pieces near the peak of the magnetic field.