×

Metering syringe

  • US 5,318,544 A
  • Filed: 10/20/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 10/20/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A syringe for metering fluid, said syringe comprising:

  • a syringe tube for holding the fluid and having an orifice at one end for discharging the fluid and a generally circular opening at an opposite end, said generally circular opening including a stop edge forming a chord across said generally circular opening; and

    a plunger slidably located in said openings of said syringe tube, said plunger having a longitudinal axis and a plurality of stop surfaces approximately perpendicular to said longitudinal axis and angularly displaced about said longitudinal axis from adjacent stop surfaces, said plunger further having a plurality of flat relief surfaces approximately parallel to said longitudinal axis and extending between and intersecting adjacent stop surfaces, said plunger having a cross-sectional shape along said longitudinal axis substantially the same as said generally circular opening with said stop edge forming said chord across said generally circular opening.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×