Method of observing liquid for impurities using a transparent container with contrasting colors

• US 5,444,539 A
• Filed: 04/28/1993
• Issued: 08/22/1995
• Est. Priority Date: 05/01/1990
• Status: Expired due to Fees

• Current Assignee: Johannes Fj Van Der Grift
• Original Assignee: Johannes Fj Van Der Grift
• Inventors: van der Grift, Johannes F. J.
• Primary Examiner(s): McGraw, Vincent P.
• Assistant Examiner(s): Keesee, LaCharles P.
• Application Number:
  US08/054,326
• Time in Patent Office: 846 Days
• Field of Search: 356/427, 356/335, 356/246, 356/240, 250/576, 250/227.11, 250/573, 215/365, 215/366, 215/12.2
• US Class Current: 356/427
• CPC Class Codes: B65D 23/14 of tags , labels, cards, coupons, decorations or the like B65D23/008 takes precedence
• CPC Class Codes: G01N 2033/0081 containers; packages; bottles
• CPC Class Codes: G01N 21/8803 Visual inspection measuring projectors G01B9/08
• CPC Class Codes: G01N 21/9027 in containers after filling

Abstract

The invention relates to a substantially transparent container for liquids on one side of which are opaque light and opaque dark areas of color observable through the container for evaluating contained liquid for particulate impurities. The container is particularly useful for pharmaceutical liquids.

Claims

1. A method of examining a pharmaceutical liquid in a transparent container having areas of contrasting colors for detecting multicolored impurities consisting of:

positioning said transparent container to align said areas of contrasting colors opposite a means of human visual detection, putting said liquid within said container into motion and illuminating said container by an illuminating means substantially perpendicular to said means of human visual detection to create scattering of light beams by said impurities while avoiding reflections of said light beams.