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. 08, 1999
Filed:
May. 13, 1997
Arthur E Colvin, Jr, Germantown, MD (US);
Other;
Abstract
A fluorescence sensing device for determining the presence or concentration of an analyte in a liquid or gaseous medium is constructed of an optical filter, which is positioned on a photodetector and which has a thin film of analyte-permeable, fluorescent indicator molecule-containing material on its top surface. An edge-emitting, light-emitting P-N junction is positioned on the top surface of the optical filter such that the P-N junction from which light is emitted is positioned within the film. Light emitted by the fluorescent indicator molecules impacts the photodetector thereby generating an electrical signal that is related to the concentration of the analyte in the liquid or gaseous medium. Fluorescence sensing devices according to this invention are characterized by very compact sizes, fast response times and high signal-to-noise ratios.