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BELLOWS PLUNGERS HAVING ONE OR MORE HELICALLY EXTENDING FEATURES, PUMPS INCLUDING SUCH BELLOWS PLUNGERS, AND RELATED METHODS

  • US 20100178184A1
  • Filed: 01/08/2010
  • Published: 07/15/2010
  • Est. Priority Date: 01/09/2009
  • Status: Active Grant
First Claim
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1. A bellows plunger, comprising a tubular body having a first closed end and an opposite, second open end, the tubular body comprising a side wall having a shape defining at least one ridge extending continuously and helically about a longitudinal axis of the tubular body from a location proximate the first closed end to a location proximate the second open end.

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