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:
Oct. 27, 1992
Filed:
Oct. 29, 1991
Applicant:
Inventor:
James C Van House, Vashon Island, WA (US);
Assignee:
The University of Michigan, Ann Arbor, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
250309 ; 250306 ; 250307 ; 250308 ;
Abstract
A positron microscope utilizes a time-of-flight adjustment and a beam gate to distinguish images produced by respective types of positronium events. If the time-of-flight of secondary electrons is approximately between 30 and 40 ns, then the electron image will represent prompt annihilations and parapositronium distributions in the target. For time-of-flight between 50 and 100 ns longer than the processing time of the electronic gating circuitry, the electron image will be a map of long-lived orthopositronium events.