Fluent material handling – with receiver or receiver coacting mea – Filling or refilling of dispensers – By operation of means causing or controlling dispensing
Reexamination Certificate
1999-09-29
2001-08-14
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
Filling or refilling of dispensers
By operation of means causing or controlling dispensing
C141S094000, C222S047000, C222S309000
Reexamination Certificate
active
06273152
ABSTRACT:
FIELD OF THE INVENTION
While this variable dosage cap has been satisfactory for its intended purpose, it has been characterized by certain disadvantages, particularly in the cost to manufacture the multi-component system, and the necessity of controlling the vacuum created in the bulb for drawings desired dosage into the pipette connected to the bulb.
After considerable research and experimentation, the exact dose dispenser of the present invention has been devised, which is relatively inexpensive to manufacture, is easily adjustable for dispensing an exact desired dosage and includes a child resistant closure.
BACKGROUND OF THE INVENTION
A variable dosage cap-mounted dropper is disclosed in Foyil U.S. Pat. No. 5,154,702, wherein an overcap housing contains a plunger for compressing a conventional closure-mounted bulb a predetermined distance corresponding to various dosages.
In Gargione U.S. Pat. No. 5,316,161, the child resistant closure is connected to the proximate end of the barrel.
SUMMARY OF THE INVENTION
The exact dose dispenser of the present invention comprises, essentially, a syringe barrel having a plurality of axially extending, circumferentially spaced bosses of different lengths integral with the inner surface of the syringe barrel side wall. A plunger is rotatably and slidably mounted in the barrel and is provided with an outwardly extending lug adapted to selectively engage the end of a respective boss when drawing a desired dosage into the syringe barrel. The syringe barrel is provided with a child resistant closure having an inner cap and an outer cap.
The proximate end of the barrel is integral with the inner cap which has dosage indicia carried on the top wall thereof viewable through an aperture in the proximate-end portion of the plunger. The dosage indicia on the top wall of the inner cap is aligned with a respective boss on the inner surface of the syringe barrel, whereby when drawing an exact dose into the syringe barrel, the plunger is pushed inwardly to the retracted position within the syringe barrel. The plunger is then rotated to a selected dosage as indicated by the indicia on the top wall of the inner cap and viewable through the aperture in the proximate-end portion of the plunger. The plunger is then pulled outwardly of the syringe barrel, thereby drawing a volume of medicament into the syringe barrel until the lug on the plunger abuts the end of the respective boss on the inner surface of the syringe barrel. An exact desired dosage is now contained in the syringe barrel which is dispensed therein by pushing the syringe plunger inwardly of the syringe barrel.
REFERENCES:
patent: 5746349 (1998-05-01), Putterman et al.
patent: 5836359 (1998-11-01), Seidler
patent: 6045003 (2000-04-01), Seidler
Buehler John D.
Mathias Eric S.
Comar Inc.
Douglas Steven O.
Renz, Jr. , PC Eugene E.
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