Pipette and method of making same
OwnerElmer F. St. Amandinventor
Life of this patent
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Abstract
A pipette having an integral stem and bulb and produced from a blank of plastic, stretchable molded material, said molded blank having a section of smaller cross sectional area than the remainder of the blank and the method consisting of cold stretching the section to reduce its dimensions in order to provide a reduced tip or other portion for the pipette, the stretching of said section resulting in a reduction of approximately 55% in the original dimensions of the section.
Claims20
A pipette for the dispensing of liquids comprising:
- a hollow bulb and hollow stem connected thereto and constructed of a stretchable plastic material;
- said stem comprising a stretched section having an inside diameter in the approximate range of 0.013 to 0.131 inch and a wall thickness in the approximate range of 0.0045 to 0.015 inch, the thickness also being small enough to provide an inside passage in said stretched section.
A method for producing a pipette for dispensing liquids comprising the steps of:
- molding a hollow pipette blank from a stretchable plastic material;
- providing in said blank a section of initial uniform dimensions along its length and of smaller cross sectional area than the remainder of the blank;
- and
- stretching said section of said blank until said section progressively reduces to final smaller uniform dimensions along its stretched length.
A method of producing a pipette for dispensing liquids comprising the steps of:
- molding a hollow pipette blank from a stretchable plastic material;
- gripping said blank at two points, the location at one of said gripping points having a smaller cross-sectional area than the remainder to the blank extending to the other gripping point;
- stretching said blank progressively from said one point toward said other point to produce from corresponding material dimensions of the stretched portion proportional to its original dimensions;
- and
- severing said stretched portion to produce a tip end for said pipette.
Dependencies are inferred from the claim text.