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Immunological testing devices and methods

  • US 4,111,754 A
  • Filed: 11/29/1976
  • Issued: 09/05/1978
  • Est. Priority Date: 11/29/1976
  • Status: Expired due to Term
First Claim
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1. An immunological testing device comprising:

  • a plastic structure having upper and lower open ends, having a through-passage of predetermined small cross-sectional area sufficiently small to retain liquid by capillary action within space thereof at at-least substantially an intermediate portion of a length thereof, and the plastic structure being elongated along a longitudinal axis of the through-passage, the ratio of the wall surface area of said through-passage being larger than the cross-sectional area of said intermediate portion, and in which said plastic structure has formed therein an enlarged funnel structure in continuous flow-relationship with the upper end of the intermediate portion of the through-passage of said predetermined small cross-sectional area.

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