Patent ID: 9289767
Filing Date: 2016-03-22
CPC Classification: B01L

Claim Text:
1. A microtube and a cap, comprising: a distal end with a closed conical bottom which holds no more than 0.01 ul-0.50 ml in volume in the microtube; a proximal end having an opening to house a plug of the cap; the cap having the plug and a tip for opening and closing the tube; an inner second ring of the cap which has a concave shape on the upper side and is depressed lower than an inner first ring on the cap to allow an optical intensity to be read accurately and covers at least 20-80% of the cap surface, and has a thickness from 0.25 mm to 0.9 mm; and the concave shaped surface of the inner second ring is made of an optically clear material.