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US 4,397,560 AGranted
Photometer with microtray well position indicator
AssigneeBio-Tek Instruments, Inc.
InventorRichard P. Andresen
Life of this patent
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AssigneeBio-Tek Instruments, Inc.
InventorRichard P. Andresen
Estimating the term…
A photometer for sensing the optical density of a plurality of liquids located in a microtray provided with a rectilinear array of wells is provided with a detent device for locating each well in alignment with the photodetector and a plurality of magnets associated with the microtray and a plurality of magnet sensors associated with the photodetector for providing signals indicative of the specific well in alignment with the photodetector. A carrier having two bar magnets disposed at right angles to each is provided for supporting the microtray with the two bar magnets disposed parallel to adjacent sides of the microtray. Two linear arrays of equally spaced magnet sensors extend outwardly from the location of the photodetector at right angles to each other and at right angles to the bar magnets, respectively.
In a photometer of the type having a flat support surface with a single substantially centrally located aperture therethrough, photodetector means for detectin and displaying optical density of different liquids disposed in a plurality of equally spaced apart wells arranged in rows and columns in a microtray adapted to be freely movable over said surface for positioning different wells in alignment with said aperture and said photodetector means and locating means for locating each well in properly aligned relation, the improvement comprising:
A position indicator for identifying the location of a first fixed point on a first member relative to a plurality of equally spaced second points in a pattern of rows and columns on a second member movable relative to said first member, comprising:
Dependencies are inferred from the claim text.