US4224567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring resistance change only in a cell analyzer and method for calibrating it
Assignee: United States Department of Energy
•
Filing: 1978-11-03
•
Granted: 1980-09-23
•
Expires: 1998-11-03
Abstract
Abstract The disclosure relates to resistance only monitoring and calibration in an electrical cell analyzer. Sample and sheath fluid flows of different salinities are utilized, the sample flow being diameter modulated to produce a selected pattern which is compared to the resistance measured across the flows.
Inventors
- 👤 Robert A. Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:40
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N15/00; G01N15/10; G01N15/1031; G01N15/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A method of calibrating a cell size measuring apparatus utilizing an electrode surrounded orifice comprising: passing a sheath fluid having a first salinity through the orifice; passing a sample stream fluid having a second salinity within the sheath fluid through the orifice; modulating the diameter of the sample stream in a predetermined pattern; and measuring resistive changes across the orifice occuring in accordance with the modulated diameter sample stream.
Claim 2
Independent Claim
69 words
A method of calibrating a cell size measuring apparatus utilizing an electrode surrounded orifice comprising: passing a sheath fluid having a first salinity through the orifice; passing a sample stream fluid having a second salinity within the sheath fluid through the orifice; modulating the diameter of the sample stream in a predetermined pattern; and measuring resistive changes across the orifice occuring in accordance with the modulated diameter sample stream.
Claim 3
Dependent Claim
27 words
The invention of claim 1 wherein the sheath fluid comprises a fluid of a lower salinity and the sample fluid comprises a fluid of a higher salinity.
Claim 4
Dependent Claim
10 words
The invention of claim 2 wherein the fluids comprise water.
Claim 5
Dependent Claim
26 words
The invention of claim 1 wherein the sheath fluid comprises a fluid of a higher salinity and the sample stream a fluid of a lower salinity.
Claim 6
Dependent Claim
10 words
The invention of claim 4 wherein the fluids comprise water.
Claim 7
Dependent Claim
15 words
The invention of claim 1 wherein the sample stream fluid is modulated by pressure variation.
Claim 8
Dependent Claim
23 words
The invention of claim 1 further comprising shorting out noise from the sample and sheath fluids prior to their passing through the orifice.
Claim 9
Independent Claim
89 words
An apparatus for calibrating resistance change only in an electrical cell size measuring system comprising: means for producing a sample fluid flow and modulating it diameter as a function of time; means for enclosing said fluid flow in a sheath fluid flow; means for passing said fluid flows through an orifice; and means for monitoring resistance change only across said sheath fluid and sample fluid flows as they pass through said orifice in order to provide a measurement of resistance change across said orifice as a function of time.
Claim 10
Independent Claim
89 words
An apparatus for calibrating resistance change only in an electrical cell size measuring system comprising: means for producing a sample fluid flow and modulating it diameter as a function of time; means for enclosing said fluid flow in a sheath fluid flow; means for passing said fluid flows through an orifice; and means for monitoring resistance change only across said sheath fluid and sample fluid flows as they pass through said orifice in order to provide a measurement of resistance change across said orifice as a function of time.
Claim 11
Dependent Claim
25 words
The invention of claim 8 further comprising means for shorting out noise from said sample and sheath fluids prior to their passing through said orifice.
References Cited (Backward Citations)
US2871445A
Cited
US3648158A
Cited
US3793587A
Cited
US3764901A
Cited
US3791517A
Cited
US3824402A
Cited
US3924180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |