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:
Feb. 19, 2008
Filed:
Nov. 12, 2002
Applicants:
Murray R. Darrach, Valencia, CA (US);
Ara Chutjian, La Crescenta, CA (US);
Inventors:
Murray R. Darrach, Valencia, CA (US);
Ara Chutjian, La Crescenta, CA (US);
Assignee:
California Institute of Technology, Pasadena, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 49/04 (2006.01); G06F 17/50 (2006.01); G01N 33/22 (2006.01); B01D 59/44 (2006.01);
U.S. Cl.
CPC ...
Abstract
A chemical sensing apparatus and method for the detection of sub parts-per-trillion concentrations of molecules in a sample by optimizing electron utilization in the formation of negative ions is provided. A variety of media may be sampled including air, seawater, dry sediment, or undersea sediment. An electrostatic mirror is used to reduce the kinetic energy of an electron beam to zero or near-zero kinetic energy.