Volumetric dispensing pipette
First Claim
Patent Images
1. A volumetric dispensing pipette for dispensing precise, predetermined quantities of liquid, comprising:
- (a) an elongated hollow tube having a centrally disposed, axially extending fluid passageway of predetermined size having upper and lower ends, the lower end being open to atmosphere;
(b) structural means connected to said tube proximate the upper end of said fluid passageway thereof for carrying at least one fluid reservoir;
(c) said at least one fluid reservoir being a generally bulb shaped, substantially closed fluid reservoir carried by said structural means having an axial centerline transversely spaced from the axial centerline of said fluid passageway of said tube;
(d) a first fluid conduit interconnecting said at least one fluid reservoir with the upper end of said fluid passageway of said tube;
(e) a yieldably deformable substantially closed hollow bulb connected to said structural means at a location proximate said at least one fluid reservoir;
(f) a second fluid conduit interconnecting said hollow bulb and said at least one fluid reservoir, said first fluid conduit, said at least one fluid reservoir and said second fluid conduit defining a circuitous fluid flow path between said upper end of said fluid passageway of said tube and said deformable hollow bulb.
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Abstract
A one-piece, blow molded pipette for dispensing precise volumetric quantities of fluid. The pipette includes a strategically positioned overflow reservoir and is uniquely configured so as to precisely control the flow paths of air and fluid within the pipette so as to positively preclude the accidental dispensing of a volumetric quantity of fluid greater than the volume of the tubular portion of the device.
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Citations
10 Claims
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1. A volumetric dispensing pipette for dispensing precise, predetermined quantities of liquid, comprising:
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(a) an elongated hollow tube having a centrally disposed, axially extending fluid passageway of predetermined size having upper and lower ends, the lower end being open to atmosphere; (b) structural means connected to said tube proximate the upper end of said fluid passageway thereof for carrying at least one fluid reservoir; (c) said at least one fluid reservoir being a generally bulb shaped, substantially closed fluid reservoir carried by said structural means having an axial centerline transversely spaced from the axial centerline of said fluid passageway of said tube; (d) a first fluid conduit interconnecting said at least one fluid reservoir with the upper end of said fluid passageway of said tube; (e) a yieldably deformable substantially closed hollow bulb connected to said structural means at a location proximate said at least one fluid reservoir; (f) a second fluid conduit interconnecting said hollow bulb and said at least one fluid reservoir, said first fluid conduit, said at least one fluid reservoir and said second fluid conduit defining a circuitous fluid flow path between said upper end of said fluid passageway of said tube and said deformable hollow bulb. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A volumetric dispensing pipette for dispensing precise, predetermined quantities of liquid, comprising:
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(a) an elongated hollow tube having an axial centerline and a centrally disposed, axially extending fluid passageway of predetermined size having upper and lower ends, the lower end being open to atmosphere; (b) a generally planar longitudinally extending web integrally formed with said tube proximate the upper end of said fluid passageway thereof; (c) a generally bulb shaped, substantially closed first fluid overflow reservoir integrally formed with said web, said fluid reservoir having an axial centerline transversely spaced from the axial centerline of said fluid passageway of said tube; (d) a generally bulb shaped substantially closed second fluid overflow reservoir integrally formed with said web, said second fluid overflow reservoir having an axial centerline transversely spaced both from the axial centerline of said fluid passageway of said tube and from the axial centerline of said first fluid overflow reservoir; (e) a fluid overflow reservoir connecting conduit connecting said first and second fluid overflow reservoirs and extending generally perpendicular to the axial centerline of said tube; (f) a yieldably of deformable substantially closed hollow bulb integrally formed with said web proximate said first and second fluid overflow reservoirs; (g) a first fluid conduit interconnecting said upper end of said fluid passageway of said tube with said fluid overflow rsservoir connecting conduit; and (h) a second fluid conduit interconnecting said hollow bulb and said first and second fluid overflow reservoirs. - View Dependent Claims (8, 9, 10)
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Specification