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Variable volume pipette

  • US 4,593,837 A
  • Filed: 03/15/1985
  • Issued: 06/10/1986
  • Est. Priority Date: 03/15/1985
  • Status: Expired due to Term
First Claim
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1. In a pipette for dispensing variable volumes and comprising a plurality of piston chambers, a piston constructed to reciprocate within each of said chambers, means for reciprocating said pistons, a passageway extending from each chamber to a next adjacent chamber, a vent passageway extending from each of said chambers to the exterior of the pipette, and mounting means for mounting disposable tips on the pipette;

  • the improvement wherein said mounting means comprises differently-sized mounting surfaces for mounting differently-sized disposable tips,and wherein all but one of said vent passageways exits on the exterior surface of said pipette at a location disposed between the mounting surface corresponding to the piston chamber vented by said each vent passageway, and the next smaller mounting surface,whereby the larger disposable tips enclose the vent passageways of the smaller disposable tips.

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