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US3756459A
Expired / Lapsed
US
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Method and apparatus for metering fluid utilizing pressure differentials
Assignee: Damon Corp
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Filing: 1971-01-12
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Granted: 1973-09-04
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Expires: 1991-01-12
Abstract
Abstract A method and apparatus for metering a second fluid contained in a pressure collapsible container having an outlet conduit. Means are provided for pressurizing a first fluid at substantially equal pressure on the outside surface of the container and in the conduit to prevent flow of second fluid in the conduit. Flow of second fluid is effected by reducing the pressure of the first fluid in the conduit.
Inventors
- 👤 J Bannister
- 👤 A Ferrari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:49
CPC Classifications
G; G01; G01N; G01N35/00; G01N35/08
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
132 words
Apparatus for metering fluids comprising a plurality of containers for housing a plurality of different fluids to be metered, means for pressurizing said fluids to be metered within said containers, a plurality of conduits leading from said containers for delivery of said fluids to be metered from said containers, means for introducing a pressurizing fluid into said conduits so as to contact the fluids to be metered and exert a pressure within each said conduit against the fluids to be metered to oppose the flow of said fluids to be metered through said conduits and means for varying the difference between the pressure within each said container and the pressure exerted by said pressurizing fluid within each conduit leading therefrom to controllably meter each said fluid to be metered through said conduits.
Claim 2
Dependent Claim
132 words
Apparatus for metering fluids comprising a plurality of containers for housing a plurality of different fluids to be metered, means for pressurizing said fluids to be metered within said containers, a plurality of conduits leading from said containers for delivery of said fluids to be metered from said containers, means for introducing a pressurizing fluid into said conduits so as to contact the fluids to be metered and exert a pressure within each said conduit against the fluids to be metered to oppose the flow of said fluids to be metered through said conduits and means for varying the difference between the pressure within each said container and the pressure exerted by said pressurizing fluid within each conduit leading therefrom to controllably meter each said fluid to be metered through said conduits.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 wherein the containers comprise collapsible containers housed in rigid containers, said collapsible containers and said conduits being in communication.
Claim 4
Dependent Claim
164 words
Apparatus for dispEnsing a fluid, said apparatus comprising a. a container for housing the fluid to be dispensed, b. an outlet conduit in communication with said container and extending therefrom for delivering dispensed fluid, c. a pressurizing conduit for a pressurizing fluid joining said outlet conduit at a junction, and d. means for applying a pressurizing fluid under a substantially predetermined pressure to said container to cause said fluid to be dispensed to flow through said outlet conduit, means for introducing a pressurizing fluid under a substantially predetermined pressure into said pressurizing conduit to enable a pressurizing fluid to contact a fluid to be dispensed and exert a back pressure within said outlet conduit against a fluid to be dispensed while a fluid to be dispensed travels in said outlet conduit and means for selectively varying the pressure exerted by said pressurizing fluid in said pressurizing conduit joining said outlet conduit through said junction to enable controlled dispensing of said fluid to be dispensed.
Claim 5
Dependent Claim
164 words
Apparatus for dispEnsing a fluid, said apparatus comprising a. a container for housing the fluid to be dispensed, b. an outlet conduit in communication with said container and extending therefrom for delivering dispensed fluid, c. a pressurizing conduit for a pressurizing fluid joining said outlet conduit at a junction, and d. means for applying a pressurizing fluid under a substantially predetermined pressure to said container to cause said fluid to be dispensed to flow through said outlet conduit, means for introducing a pressurizing fluid under a substantially predetermined pressure into said pressurizing conduit to enable a pressurizing fluid to contact a fluid to be dispensed and exert a back pressure within said outlet conduit against a fluid to be dispensed while a fluid to be dispensed travels in said outlet conduit and means for selectively varying the pressure exerted by said pressurizing fluid in said pressurizing conduit joining said outlet conduit through said junction to enable controlled dispensing of said fluid to be dispensed.
Claim 6
Dependent Claim
15 words
The apparatus as set forth in claim 3 wherein said junction is a tee junction.
Claim 7
Dependent Claim
120 words
Apparatus for metering fluids comprising a container for housing a fluid to be metered, means for pressurizing said fluid to be metered within said container, a conduit leading from said container for the delivery of said fluid to be metered, means for introducing a pressurizing fluid into said conduit so as to contact the fluid to be metered and exert a back pressure within said conduit against said fluid to be metered to oppose the flow of said fluid to be metered through said conduit, and means for controllably varying the difference between the pressure within the container and the pressure exerted by the pressurizing fluid within said conduit to controllably meter said fluid to be metered through said conduit.
Claim 8
Dependent Claim
120 words
Apparatus for metering fluids comprising a container for housing a fluid to be metered, means for pressurizing said fluid to be metered within said container, a conduit leading from said container for the delivery of said fluid to be metered, means for introducing a pressurizing fluid into said conduit so as to contact the fluid to be metered and exert a back pressure within said conduit against said fluid to be metered to oppose the flow of said fluid to be metered through said conduit, and means for controllably varying the difference between the pressure within the container and the pressure exerted by the pressurizing fluid within said conduit to controllably meter said fluid to be metered through said conduit.
Claim 9
Dependent Claim
32 words
The apparatus as set forth in claim 5 further comprising automatic sensing means for monitoring fluid flow in said conduit and actuating said means for controllably varying the difference between said pressures.
Claim 10
Dependent Claim
43 words
The apparatus of claim 6 wherein said automatic sensing means comprises means for sensing an interface between said fluid to be metered and said pressurizing fluid within the conduit either to increase or decrease the pressure of said pressurizing fluid in said conduit.
Claim 11
Dependent Claim
174 words
Apparatus for dispensing a liquid, said apparatus comprising: a. a substantially rigid container, b. a collapsible container within said rigid container for housing the liquid to be dispensed, c. an outlet conduit in communication with said collapsible container and extending therefrom for delivering dispensed liquid, d. means for applying a pressurizing fluid to a space between said substantially rigid container and said collapsible container at a substantially predetermined pressure to cause said liquid to be dispensed to flow through said outlet conduit, e. a pressurizing fluid conduit joining said outlet conduit at a junction, f. means for introducing a pressurizing fluid under a substantially predetermined pressure into said pressurizing conduit to enable a pressurizing fluid to contact a fluid to be dispensed and exert a back pressure within said outlet conduit against a fluid to be dispensed while a fluid to be dispensed travels in said outlet conduit, and g. means, including a valve, for selectively venting a pressurizing fluid at a source pressure at least equal to said predetermined pressure, through said junction.
Claim 12
Dependent Claim
174 words
Apparatus for dispensing a liquid, said apparatus comprising: a. a substantially rigid container, b. a collapsible container within said rigid container for housing the liquid to be dispensed, c. an outlet conduit in communication with said collapsible container and extending therefrom for delivering dispensed liquid, d. means for applying a pressurizing fluid to a space between said substantially rigid container and said collapsible container at a substantially predetermined pressure to cause said liquid to be dispensed to flow through said outlet conduit, e. a pressurizing fluid conduit joining said outlet conduit at a junction, f. means for introducing a pressurizing fluid under a substantially predetermined pressure into said pressurizing conduit to enable a pressurizing fluid to contact a fluid to be dispensed and exert a back pressure within said outlet conduit against a fluid to be dispensed while a fluid to be dispensed travels in said outlet conduit, and g. means, including a valve, for selectively venting a pressurizing fluid at a source pressure at least equal to said predetermined pressure, through said junction.
Claim 13
Dependent Claim
31 words
Apparatus as set forth in claim 8 including means for providing an adjustabe flow restriction in said outlet conduit downstream of said junction for adjustment of back pressure during said venting.
Claim 14
Dependent Claim
15 words
The apparatus as set forth in claim 8 wherein said junction is a tee junction.
Claim 15
Independent Claim
229 words
A method for metering fluids from a container having a conduit leading from the container for the delivery of fluids to be metered comprising the steps of: a. introducing a fluid to be meterEd into said container, b. providing means for pressurizing said fluid to be metered while in said container, c. providing means for introducing a pressurizing fluid into said conduit for exerting a back pressure within said conduit with a pressurizing fluid which is substantially immiscible with the fluid to be metered and which contacts the fluid to be metered as it travels in said conduit, the back pressure of said pressurizing fluid enabling a controllable opposition to the flow of said fluid to be metered through said conduit, d. thereafter, causing the pressure within the container to be greater than the pressure exerted by said pressurizing fluid against said fluid to be metered within said conduit to produce a flow of said fluid to be metered through said conduit, and e. causing said pressurizing fluid to contact the fluid to be metered within said conduit and exert a sufficient pressure against said fluid to be metered flowing through said conduit to stop the flow of fluid to be metered after the desired amount of fluid to be metered has flowed past the point in said conduit at which said pressurizing fluid is introduced into said conduit.
Claim 16
Independent Claim
229 words
A method for metering fluids from a container having a conduit leading from the container for the delivery of fluids to be metered comprising the steps of: a. introducing a fluid to be meterEd into said container, b. providing means for pressurizing said fluid to be metered while in said container, c. providing means for introducing a pressurizing fluid into said conduit for exerting a back pressure within said conduit with a pressurizing fluid which is substantially immiscible with the fluid to be metered and which contacts the fluid to be metered as it travels in said conduit, the back pressure of said pressurizing fluid enabling a controllable opposition to the flow of said fluid to be metered through said conduit, d. thereafter, causing the pressure within the container to be greater than the pressure exerted by said pressurizing fluid against said fluid to be metered within said conduit to produce a flow of said fluid to be metered through said conduit, and e. causing said pressurizing fluid to contact the fluid to be metered within said conduit and exert a sufficient pressure against said fluid to be metered flowing through said conduit to stop the flow of fluid to be metered after the desired amount of fluid to be metered has flowed past the point in said conduit at which said pressurizing fluid is introduced into said conduit.
Claim 17
Dependent Claim
25 words
The method of claim 11 wherein said pressurizing fluid is introduced simultaneously into a plurality of conduits, each conduit being associated with a separate container.
Claim 18
Dependent Claim
14 words
The method of claim 11 wherein a plurality of conduits communicate with said contiainer.
Claim 19
Dependent Claim
29 words
The method of claim 11 wherein said pressurizing fluid is introduced into said conduit intermittently and automatically to meter said fluid to be metered as a plurality of aliquots.
Claim 20
Dependent Claim
100 words
The method of claim 14 wherein an interface of an aliquot between said fluid to be metered and said pressurizing fluid is sensed by a sensing element which, in conjunction with a signal generator, generates a signal to increase the pressure of said pressurizing fluid to prevent flow of said fluid to be metered from said container and a second interface of said aliquot is sensed by a sensing element which, in conjunction with a signal generator, generates a signal to decrease the pressure of said pressurizing fluid to allow flow of said fluid to be metered from said container.
Claim 21
Dependent Claim
24 words
The method of claim 14 wherein said aliquots are directed to a mixing zone to be admixed each with one sample to be analyzed.
Claim 22
Dependent Claim
25 words
The method of claim 14 wherein said aliquots are directed to a mixing zone to be admixed each with a blood sample to be analyzed.
Claim 23
Dependent Claim
24 words
The method of claim 14 wherein the fluid to be metered is introduced into a collapsible container which is housed in a rigid container.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |