TEST STRIP PACKAGED-UNIT

• US 3,642,450 A
• Filed: 01/06/1970
• Issued: 02/15/1972
• Est. Priority Date: 01/16/1969
• Status: Expired due to Term

• Current Assignee: Sven Axel Eriksson
• Original Assignee: Sven Axel Eriksson
• Inventors: Eriksson, Sven Axel
• Primary Examiner(s): Wolk, Morris O.
• Assistant Examiner(s): Reese, R. M.
• Application Number:
  US05/000,879
• Time in Patent Office: 770 Days
• Field of Search: 23/253TP,253 206/56AA
• US Class Current: 422/409
• CPC Class Codes: B65D 75/40 Packages formed by enclosing successive articles, or increments of material, in webs, e.g. folded or tubular webs, or by subdividing tubes filled with liquid, semi-liquid, or plastic materials
• CPC Class Codes: B65D 75/5827 Tear-lines provided in a wall portion B65D75/5805, B65D75/5816 take precedence

Abstract

A packaged-unit comprising a sealed envelope of partible thermoplastic film material within which is enclosed an elongated absorbent test strip having an indicator portion subject to change in color by interaction with a sample to be tested. The envelope has an empty finger-gripping part extending beyond one end of the test strip and stopping means for it in the inner end of that part to restrain the strip from slipping into the empty end. The indicator part of the test strip is remote from the finger-grip part of the envelope. Intermediate the outer ends of the envelope and disposed in substantially oppositely aligned spaced-apart relationship with respect to each other are sealed welded parting lines each separately extending inwardly from its respective one of the elongated sides of the envelope. The parting lines enable the different parts of the envelope defined thereby to be pulled apart from one another along a line running through the parting lines when the end portions of the envelope are tightly gripped and pulled in opposite directions.

Claims

2. A test strip packaged-unit as claimed in claim 1, wherein the empty portion of said envelope includes stopping means in the inner end of said finger-gripping part of the envelope and outside of and adjacent the nearer end of said test strip, thereby to restrain said test strip from slipping into the empty end of the envelope.

3. A test strip packaged-unit as claimed in claim 1, wherein the hand-pullably partible thermoplastic resin film consists of polyethylene film of less than about 0.10 millimeter thickness requiring a tension to pull its envelope apart less than about 3 kiloponds applied at the rate of 50 to 500 millimeters per minute.

4. A test strip packaged-unit as claimed in claim 1, wherein there is a transparent wall of the envelope adjacent the indicator portion of said test strip.

5. A test strip packaged-unit as claimed in claim 4, wherein at least the inner surface of the other wall of said envelope so differs in color from the aforesaid transparent wall and the color change portion of the test strip as to enhance the color contrast of the reaction color change developed in said color change portion by the liquid tested.