US3143880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscosity compensated flowmeter
Assignee: PPG Architectural Coatings Canada Inc
•
Filing: 1960-06-20
•
Granted: 1964-08-11
•
Expires: 1980-06-20
Abstract
No abstract record available.
Inventors
- 👤 Goldstein David John
- 👤 Grimley Samuel Slater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:27
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
AN APPARATUS FOR MEASURING THE FLOW RATE OF A FLUID WHOSE VISCOSITY AND TEMPERATURE CHANGE RAPIDLY, WHICH COMPRISES TWO SUBSTANTIALLY IDENTICAL CAPILLARY TUBES, A FLUID FLOW DIVIDING MEANS TO THE DOWNSTREAM ARMS OF WHICH SAID CAPILLARY TUBES ARE CONNECTED, A CONSTANT VOLUME PUMP CONNECTED TO THE FIRST OF SAID CAPILLARY TUBES AND PRESSURE DIFFERENCE MEASURING MEANS CONNECTED ACROSS EACH OF SAID CAPILLARY TUBES, SAID APPARATUS BEING SO CONSTRUCTED AND ARRANGED THAT THE FLUID PASSES THROUGH BOTH OF SAID CAPILLARY TUBES IN STREAMLINE FLOW AND IN SUBSTANTIALLY IDENTICAL PHYSICAL CONDITION, AND THAT THE FLUID FLOW TO BE MEASURED PASSES ONLY THROUGH THE SECOND OF SAID CAPILLARY TUBES AND THE FLOW RATE THEREOF EQUALS THE RATIO OF THE PRESSURE DROP ACROSS THE SECOND CAPILLARY TUBE TO THAT ACROSS THE FIRST CAPILLARY TUBE MULTIPLIED BY THE FLOW RATE THROUGH THE CONSTANT VOLUME PUMP.
Claim 2
Independent Claim
140 words
AN APPARATUS FOR MEASURING THE FLOW RATE OF A FLUID WHOSE VISCOSITY AND TEMPERATURE CHANGE RAPIDLY, WHICH COMPRISES TWO SUBSTANTIALLY IDENTICAL CAPILLARY TUBES, A FLUID FLOW DIVIDING MEANS TO THE DOWNSTREAM ARMS OF WHICH SAID CAPILLARY TUBES ARE CONNECTED, A CONSTANT VOLUME PUMP CONNECTED TO THE FIRST OF SAID CAPILLARY TUBES AND PRESSURE DIFFERENCE MEASURING MEANS CONNECTED ACROSS EACH OF SAID CAPILLARY TUBES, SAID APPARATUS BEING SO CONSTRUCTED AND ARRANGED THAT THE FLUID PASSES THROUGH BOTH OF SAID CAPILLARY TUBES IN STREAMLINE FLOW AND IN SUBSTANTIALLY IDENTICAL PHYSICAL CONDITION, AND THAT THE FLUID FLOW TO BE MEASURED PASSES ONLY THROUGH THE SECOND OF SAID CAPILLARY TUBES AND THE FLOW RATE THEREOF EQUALS THE RATIO OF THE PRESSURE DROP ACROSS THE SECOND CAPILLARY TUBE TO THAT ACROSS THE FIRST CAPILLARY TUBE MULTIPLIED BY THE FLOW RATE THROUGH THE CONSTANT VOLUME PUMP.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |