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:
Jun. 04, 1991
Filed:
Apr. 28, 1989
Donald N Campbell, Lake Jackson, TX (US);
Glenn E Spangler, Lutherville, MD (US);
Robert C Davis, Jr, Westminster, MD (US);
Eugene F Fafaul, Phoenix, MD (US);
John P Carrico, Jr, Baltimore, MD (US);
Environmental Technologies Group, Inc., Baltimore, MD (US);
Abstract
An ion mobility spectrometer is described for detecting sample gas in a carrier gas incorporating a block of ceramic material having a passageway wherein the passageway contains an ionization source, a resistive material on the walls of the passageway prior to and after a shutter grid to form a reaction region and drift region respectively, an aperture grid and a collector. A radioactive or non-radioactive ionization source may be inserted into one end of the passageway while the aperture grid and collector may be inserted into the other end and rigidly positioned with respect to the block of ceramic material. The invention simplifies the exchange of the ionization sources where it may be either radioactive or non-radioactive, and improves the assembling and sealing of the ion mobility spectrometer cell.