Patent US2426589A successfully refreshed from Google Patents.
US3877609A
Expired / Lapsed
US
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Measured dosing dispenser utilizing flow line deformer and method of dispensing
Assignee: Baxter International Inc
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Filing: 1973-10-23
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Granted: 1975-04-15
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Expires: 1993-10-23
Abstract
Abstract A dispensing apparatus provides a fluid flow path of the recirculating type. A pump provides circulation of fluid within the flow path from a reservoir through a dispenser whose nozzle output may be disposed for dispensing. An actuator is coupled to the dispenser and operates to dispense from the nozzle an accurate measured volume of fluid at times when the pump is inoperative and the fluid within the flow line is otherwise static. Fluid is dispensed upon distortion of the flow line as a result of displacement of surrounding fluid in a closed system.
Inventors
- 👤 Herbert M Cullis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:02
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F04B43/10; F04B43/107; F04B23/00; F04B23/04; F04B23/08; F04B23/10; F04B43/12; F04B43/1253
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
131 words
A system for dispensing precisely measured volumes of liquids, comprising: a reservoir for holding liquids; a liquid conduit, having a dispensing port, said conduit coupled to the reservoir for receiving liquids therefrom; means coupled to the conduit for filling it with liquid and for occluding the conduit to hold a substantially static liquid column therein which column extends to the dispensing port; and dispensing means including a housing enveloping a distortable portion of said conduit providing a closed space therearound, noncompressible fluid medium filling said space, and means for displacing a selected volume of said medium within said closed space thereby to distort said enveloped distortable portion of said conduit, whereby a precisely measured volume of fluid equal to said selected volume may be dispensed from said conduit via said port.
Claim 2
Independent Claim
131 words
A system for dispensing precisely measured volumes of liquids, comprising: a reservoir for holding liquids; a liquid conduit, having a dispensing port, said conduit coupled to the reservoir for receiving liquids therefrom; means coupled to the conduit for filling it with liquid and for occluding the conduit to hold a substantially static liquid column therein which column extends to the dispensing port; and dispensing means including a housing enveloping a distortable portion of said conduit providing a closed space therearound, noncompressible fluid medium filling said space, and means for displacing a selected volume of said medium within said closed space thereby to distort said enveloped distortable portion of said conduit, whereby a precisely measured volume of fluid equal to said selected volume may be dispensed from said conduit via said port.
Claim 3
Dependent Claim
20 words
The invention of claim 1 wherein said means for occulating the conduit includes means for closing a flexible portion thereof.
Claim 4
Dependent Claim
15 words
The invention of claim 1 wherein said means for filling the conduit includes a pump.
Claim 5
Dependent Claim
26 words
The invention of claim 1 wherein said port is of small size so as to prevent loss of fluid therefrom when the static column is formed.
Claim 6
Dependent Claim
27 words
The invention of claim 1 wherein the conduit is formed of a unitary flexible line and said means for filling and occulating the conduit is peristaltic pump.
Claim 7
Dependent Claim
13 words
The system of claim 1 wherein said housing is of rigid wall construction.
Claim 8
Dependent Claim
26 words
The system of claim 1 wherein said displacing means comprises a rod movable between limits within said closed space, and means for moving linearly said rod.
Claim 9
Dependent Claim
54 words
The system of claim 1 wherein said displacing means comprises a syringe having a chamber mounted on said housing to provide fluid communication between said closed space and said chamber, a noncompressible fluid medium within said chamber, a piston within said chamber, and means for moving said piston to pass fluid from said chamber.
Claim 10
Independent Claim
148 words
The method of dispensing a precisely measured volume of liquid using a conduit having a dispensing port and also including a deformable portion which portion is surrounded by a housing to provide a closed space thereabout with a noncompressible fluid medium filling that closed space, and means for selectively displacing said medium to distort that portion, the conduit being coupled to a reservoir of liquid, comprising the steps of: a. filing said conduit with liquid from said reservior; b. occulding said conduit to isolate the reservoir from both the port and deformable portion and to hold therein a column of fluid which extends to the port; and c. operating said means for selectively displacing said medium to distort the surrounding conduit portion and thereby displace a selected volume of said medium and cause a volume of fluid equal to said selected volume to be dispensed from said port.
Claim 11
Independent Claim
148 words
The method of dispensing a precisely measured volume of liquid using a conduit having a dispensing port and also including a deformable portion which portion is surrounded by a housing to provide a closed space thereabout with a noncompressible fluid medium filling that closed space, and means for selectively displacing said medium to distort that portion, the conduit being coupled to a reservoir of liquid, comprising the steps of: a. filing said conduit with liquid from said reservior; b. occulding said conduit to isolate the reservoir from both the port and deformable portion and to hold therein a column of fluid which extends to the port; and c. operating said means for selectively displacing said medium to distort the surrounding conduit portion and thereby displace a selected volume of said medium and cause a volume of fluid equal to said selected volume to be dispensed from said port.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |