Dispensing – With filter – Associated with vent passage
Patent
1991-01-17
1993-06-15
Olszewski, Robert P.
Dispensing
With filter
Associated with vent passage
222212, 222420, 21032164, 21032184, 604295, B67D 558
Patent
active
052191010
ABSTRACT:
A device for dispensing liquids in drop form of substantially uniform size is provided which includes a container having a dropper tip including a passageway for ingress of air to and egress of liquid from the device, the passageway communicating between the container and an orifice in the dropper tip; means for temporarily reducing the volume of the container; and, disposed within the dropper tip, across the passageway, a microporous composite membrane with pores of a size to resist passage of contaminants. The membrane has a liquophilic component which permits delivery of drops of a liquid to a desired location outside the container and a liquophobic component which is adapted to resist the passage of such liquid but to permit the passage therethrough of air. Both the liquophilic and liquophobic components of the membrane (which intersects the passageway) communicate with the passageway. The surface area and pore size of the liquophilic component is so selected as to meter liquid being dispensed in drop form and avoid a stream of liquid from emerging from the dropper tip during normal use.
REFERENCES:
patent: 2263890 (1941-11-01), Salvesen
patent: 2806637 (1957-09-01), Wallingford
patent: 2987223 (1961-06-01), Armour
patent: 3149758 (1964-09-01), Bush et al.
patent: 3189223 (1965-06-01), Mackal
patent: 3241731 (1966-03-01), Bright et al.
patent: 3248017 (1966-04-01), Allen
patent: 3449081 (1969-06-01), Hughes
patent: 3631654 (1972-01-01), Riely
patent: 3645262 (1972-02-01), Harrigan
patent: 3760987 (1973-09-01), Meterhoefer
patent: 4002168 (1977-01-01), Petterson
patent: 4093124 (1978-06-01), Morane et al.
patent: 4203848 (1980-05-01), Grandine, II
patent: 4319996 (1982-03-01), Vincent et al.
patent: 4463880 (1984-08-01), Kramer et al.
patent: 4471890 (1984-09-01), Dougherty
patent: 4533068 (1985-08-01), Meierhoefer
patent: 4797259 (1989-01-01), Matkovich et al.
patent: 4915839 (1990-04-01), Marinaccio et al.
patent: 4917271 (1990-04-01), Kanner et al.
patent: 4938389 (1990-07-01), Rossi et al.
patent: 4968310 (1990-11-01), Menchel et al.
patent: 5040706 (1991-08-01), Davis et al.
Bormann Thomas
Henley Martin W.
Matkovich Vlado I.
Schlaudecker Thomas E.
Merck & Co. , Inc.
Milef Boris
Olszewski Robert P.
Pall Corporation
LandOfFree
Contamination-resistant dispensing and metering drop forming dev does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contamination-resistant dispensing and metering drop forming dev, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contamination-resistant dispensing and metering drop forming dev will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1037606