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. 14, 2003
Filed:
Aug. 19, 1997
Thomas T. Hubscher, Gaithersburg, MD (US);
Erik P. Lillehoj, West Friendship, MD (US);
Other;
Abstract
An immunoassay of a liquid biological specimen for a specific analyte is conducted by forming a test sample by contacting the specimen with: (1) a binding substance of a ligand, antiligand or receptor capable of binding the analyte and (2) a detector substance of a colloidal gold or silver labeled ligand or antiligand to form a test sample. The test sample is applied by flowing onto a defined zone of an insoluble porous support film having a pore size impassable to a complex formed between the analyte, if present, with the binding substance and the detector substance, but passable to the binding substance and detector substance while remaining uncomplexed in the absence of the desired analyte. If the analyte is present in the test specimen, the detector substance binds with the analyte and the binding substance to form a visually inspectable complex on the surface of the porous support film. After application of the test sample to the porous support, the surface of the porous support is visually inspected for color to determine the presence and quantity or the absence of the analyte being assayed.