Resources Contact Us Home
Light transmittance type analytical system and variable transmittance optical component and test device for use therein

Image Number 7 for United States Patent #5431880.

A light transmittance type analytical system for the rapid quantitation of minute amounts of an analyte in a fluid sample and an optical component and test device useful therein are; disclosed. The analytical system employs an assay in which the presence of the analyte in the assayed sample is productive of an insoluble substantially opaque, light absorptive colored end product. In the preferred use of the analytical system, the end product is formed in contact with a light and fluid permeable optical component in the form of a matrix of compacted substantially water insoluble granules of reflective material which has a light scattering coefficient of at least about 80 and is substantially nonabsorptive of light. Contact of particles of the end product with granules of the matrix causes a rapid and dramatic reduction in the light transmittance capability of the matrix which is monitored by the instrument to provide amplified quantitation of the analyte, which quantitation results from the two-fold effect of direct absorption of light by the end product, and reduction of the light scattering coefficient of the matrix granules caused by contact thereof by the end product. The instrument performs all of the steps of the assay when the test device is in operative position therein, and is well adapted for preprogrammed automated operation under computer control.

  Recently Added Patents
Combination immunotherapy for the treatment of cancer
Selecting modulation and coding scheme in the presence of interference
Stacked type semiconductor memory device and chip selection circuit
Actuators and moveable elements with position sensing
Quinazoline compounds and their use in perfume compositions
Circuits for prevention of reverse leakage in charge pumps
Method and apparatus for providing charging status information to subscriber of communication service
  Randomly Featured Patents
Optical sensor and optical unit
Aromatic amino ethers as pain relieving agents
Eastern Arabic number display
Refrigerant tubes for heat exchangers
Pole and piling protector
Bookbinding apparatus and bookbinding system
Microporous carbon and method for making the same
Motor control apparatus
Cable marker device
Modular motor vehicle chassis