Coating processes – Interior of hollow article coating
Patent
1973-08-08
1976-05-18
Gwinnell, Harry J.
Coating processes
Interior of hollow article coating
734254P, 427256, 427287, 427430, B05D 722, B01L 302
Patent
active
039580458
ABSTRACT:
An automatic filling capillary pipet having a tubular body defining an elongated bore having a fluid entry end. The interior surface of the tubular body having a first zone with hydrophobic means for resisting wetting by aqueous liquids. The tubular body interior surface having a second zone which is hydrophilic with respect to aqueous fluids. Introduction of an aqueous fluid into the elongated bore will effect retention therein of a predetermined volume of aqueous fluid proportional to the cross section of the bore and the length of the second zone. In one embodiment the hydrophobic first zone originates at a position spaced from the fluid entry end and the hydrophilic second zone is disposed between the first zone and the fluid entry end. In another embodiment a hydrophobic third zone is disposed intermediate the hydrophilic second zone and the fluid entry end.
A method of making the above-identified type of pipet by providing a tubular pipet body composed of a hydrophilic glass material and establishing a hydrophobic first zone within the tubular pipet body, as by immersion, and providing a hydrophilic second zone between the fluid entry end of the tube and the first zone. A hydrophobic third zone may be established between the fluid entry end and the second zone.
REFERENCES:
patent: 2111576 (1938-03-01), Stewart
patent: 2498485 (1950-02-01), Clawson
patent: 2501737 (1950-03-01), Porter et al.
patent: 2694018 (1954-11-01), Gehnrich
patent: 2944298 (1960-07-01), Bernhardt et al.
patent: 2974528 (1961-03-01), Sanz
patent: 3138299 (1964-06-01), Staunton
patent: 3285296 (1966-11-01), Ishimaru et al.
patent: 3406573 (1968-10-01), Burke
patent: 3500689 (1970-03-01), Band
patent: 3641823 (1972-02-01), Harris et al.
patent: 3783696 (1974-01-01), Coleman
Frenkel Stuart D.
Gwinnell Harry J.
Silverman Arnold B.
LandOfFree
Method of making an automatic volume control pipet does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making an automatic volume control pipet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making an automatic volume control pipet will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2237007