US3324720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for determining rate of flow by measurement of electrical property of stream
Assignee: Friends of Psychiatric Research Inc
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Filing: 1963-07-29
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Granted: 1967-06-13
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 George F Sutherland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:46
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/64; A; A61; A61B; A61B5/00; A61B5/42; A61B5/4261; A61B5/4277
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A FLOWMETER COMPRISING A FLUID PASSAGE HAVING A PAIR OF SPACED ELECTRODES DEFINING THEREBETWEEN A MEASUREMENT SPACE, MEANS FOR CONTINUOUSLY MOVING FLUID FROM A FIRST SOURCE ALONG SAID PASSAGE AND THROUGH SAID MEASUREMENT SPACE AT A PREDETERMINED RATE, MEANS FOR INJECTING A SUBSTANCE FROM A SECOND SOURCE INTO SAID MEASUREMENT SPACE IN PROPORTION TO A RATE TO BE MEASURED WHICH VARIES INDEPENDENTLY OF SAID FIRST RATE AND FOR CONTINUOUSLY DIFFUSING SAID SUBSTANCE INTO THE FLUID IN SAID MEASUREMENT SPACE, SAID SUBSTANCE HAVING AN ELECTRICAL PROPERTY SUBSTANTIALLY DIFFERENT FROM SAID FLUID, AND MEANS COUPLED TO SAID ELECTRODES FOR CONTINUOUSLY DERIVING AN OUTPUT
Claim 2
Dependent Claim
101 words
A FLOWMETER COMPRISING A FLUID PASSAGE HAVING A PAIR OF SPACED ELECTRODES DEFINING THEREBETWEEN A MEASUREMENT SPACE, MEANS FOR CONTINUOUSLY MOVING FLUID FROM A FIRST SOURCE ALONG SAID PASSAGE AND THROUGH SAID MEASUREMENT SPACE AT A PREDETERMINED RATE, MEANS FOR INJECTING A SUBSTANCE FROM A SECOND SOURCE INTO SAID MEASUREMENT SPACE IN PROPORTION TO A RATE TO BE MEASURED WHICH VARIES INDEPENDENTLY OF SAID FIRST RATE AND FOR CONTINUOUSLY DIFFUSING SAID SUBSTANCE INTO THE FLUID IN SAID MEASUREMENT SPACE, SAID SUBSTANCE HAVING AN ELECTRICAL PROPERTY SUBSTANTIALLY DIFFERENT FROM SAID FLUID, AND MEANS COUPLED TO SAID ELECTRODES FOR CONTINUOUSLY DERIVING AN OUTPUT
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) | 1970-06-12 | 1970-12-12 | 1971-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-12 | 1974-12-12 | 1975-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-12 | 1978-12-12 | 1979-06-13 | $7700.00 | Window Closed / Lapsed |