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:
May. 22, 1990
Filed:
Sep. 22, 1988
James W Walsh, Baltimore, MD (US);
Other;
Abstract
The present invention provides a dropper tip suitable for dispensing small-volume droplets of fluid with a minimum drop-to-drop volumetric variation. The dropper tip includes a minimum-surface dispensing tip and a similar minimum-surface interior configuration that minimizes the surface area available at the entry port of the dispenser tip for the aggregation or adhesion of bubbles. In the preferred embodiment, the minimum-surface configuration allows for uniform drop formation at the tip whether or not the dropper is in a vertically inverted or inclined position when dispensing. The interior configuration likewise minimizes the surface area available for air bubbles to congregate or adhere and thereby minimizes the probability of an air bubble reentering the dropper tip when dispensing the second or subsequent drop. A cap effects sealing on a surface other than the tip so that repeated capping and uncapping will not degrade the minimum-surface rim.