Patent US4194743A successfully refreshed from Google Patents.
Patent US3690340A successfully refreshed from Google Patents.
US3690340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid proportioning system
Assignee: Individual
•
Filing: 1970-03-05
•
Granted: 1972-09-12
•
Expires: 1990-03-05
Abstract
Abstract A dialysate proportioning system in which salt concentrate and water from two lines are combined in a mixing chamber, the pressure drops across a linear concentrate resistor in the concentrate line and a linear water resistor in the water line are maintained at equal values by pressurization of the concentrate in a reservoir, and the conductivity of the dialysate is maintained by an electrical conductivity control which varies a trim valve bypassing the water resistor.
Inventors
- 👤 Anatole J Sipin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:42
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1654; A61M1/1656; A61M1/1666; A61M1/1668; B; B01; B01F; B01F35/00; B01F35/20; B01F35/21; B01F35/2133; B01F35/80; B01F35/82; G; G05; G05D; G05D21/00; G05D21/02; B01F23/00; B01F23/40; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509; Y10T137/2514; Y10T137/2521; Y10T137/2526; Y10T137/2931; Y10T137/3112; Y10T137/3115; Y10T137/3127; Y10T137/8593; Y10T137/8597
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
257 words
A dialysate proportioning system including a pressurizable reservoir containing a salt concentrate; a water inlet tap; a linear water resiStor with an inlet and an outlet, characterized by a linear relation between flow rate and pressure drop caused by laminar flow of water therethrough; a linear concentrate resistor with an inlet and an outlet, characterized by a linear relation between flow rate and pressure drop caused by laminar flow of concentrate therethrough; a dialysate mixing chamber with an outlet and communicating directly with the outlets of the two resistors; a water conduit, connected between the water inlet tap and the inlet of the water resistor; a concentrate conduit, connected between the pressurizable reservoir and the concentrate resistor; means to apply pressure to the concentrate in the reservoir so that the pressure in the concentrate conduit at the inlet to the concentrate resistor is equal to the pressure in the water conduit at the inlet to the water resistor; an electric motor-driven trim valve, connected in a line bypassing the water resistor, said valve having a minimum resistance substantially greater than that of the water resistor to provide a fine adjustment of the water resistor with limited effectiveness; a dialysate conduit connected to the outlet of the mixing chamber; means including an electrical conductivity sensor in the dialysate conduit for driving the valve in response to variation in conductivity to effectively change the resistance of the water resistor and thereby varying the proportion of the water and concentrate flows to maintain the dialysate concentration at a selected value.
Claim 2
Dependent Claim
257 words
A dialysate proportioning system including a pressurizable reservoir containing a salt concentrate; a water inlet tap; a linear water resiStor with an inlet and an outlet, characterized by a linear relation between flow rate and pressure drop caused by laminar flow of water therethrough; a linear concentrate resistor with an inlet and an outlet, characterized by a linear relation between flow rate and pressure drop caused by laminar flow of concentrate therethrough; a dialysate mixing chamber with an outlet and communicating directly with the outlets of the two resistors; a water conduit, connected between the water inlet tap and the inlet of the water resistor; a concentrate conduit, connected between the pressurizable reservoir and the concentrate resistor; means to apply pressure to the concentrate in the reservoir so that the pressure in the concentrate conduit at the inlet to the concentrate resistor is equal to the pressure in the water conduit at the inlet to the water resistor; an electric motor-driven trim valve, connected in a line bypassing the water resistor, said valve having a minimum resistance substantially greater than that of the water resistor to provide a fine adjustment of the water resistor with limited effectiveness; a dialysate conduit connected to the outlet of the mixing chamber; means including an electrical conductivity sensor in the dialysate conduit for driving the valve in response to variation in conductivity to effectively change the resistance of the water resistor and thereby varying the proportion of the water and concentrate flows to maintain the dialysate concentration at a selected value.
Claim 3
Dependent Claim
51 words
A dialysate proportioning system of the character claimed in claim 1 in which the reservoir pressurizing means includes a flexible membrane dividing the reservoir into two chambers, a first chamber containing the concentrate, and a second chamber containing water, and a pressurizing conduit connecting the second chamber with the water conduit.
Claim 4
Dependent Claim
121 words
A dialysate proportioning system of the character claimed in claim 1 in which the reservoir pressurizing means includes a pneumatic line supplying compressed air; an air pressure controller with a compressed air supply port, first and second fluid pressure inlet ports, and an outlet port, said controller supplying a control air pressure at the outlet port related to the difference between the fluid pressures at the first and second inlet ports, a connection between the pneumatic line and the air supply port; a concentrate pressure line between the concentrate conduit and the first inlet port; a water pressure line between the water conduit and the second inlet port, and a control air pressure line between the outlet port and the reservoir.
Claim 5
Dependent Claim
34 words
A dialysate proportioning system of the character claimed in claim 1, including means to maintain the concentrate supplied to the concentrate resistor at the same temperature as the water supplied to the water resistor.
References Cited (Backward Citations)
US1333986A
Cited
US2058309A
Cited
US2323341A
Cited
US2849015A
Cited
US2799288A
Cited
US2865388A
Cited
GB899681A
Cited
US3025876A
Cited
US3021863A
Cited
US3166096A
Cited
US3292650A
Cited
US3414522A
Cited
US3556141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |