US3177709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic flowmeter
Assignee: Fischer and Porter Co
•
Filing: 1961-04-04
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Granted: 1965-04-13
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Expires: 1981-04-04
Abstract
No abstract record available.
Inventors
- 👤 Fischer Kermit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A FLOWMETER COMPRISING A METALLIC CONDUIT FOR FLOWING LIQUID, ELECTROMAGNETIC MEANS PROVIDING AN ALTERNATING MAGNETIC FIELD TRANSVERSE TO SAID CONDUIT AND THREADING SAID CONDUIT, MEANS SUPPLYING ALTERNATING CURRENT TO SAID ELECTROMAGNETIC MEANS, ELECTRODES INSULATED FROM SAID CONDUIT, EXPOSED TO LIQUID FLOWING THROUGH SAID CONDUIT, AND LOCATED ON A LINE EXTENDING TRANSVERSELY THROUGH SAID FIELD TO PICK UP SIGNALS GENERATED BY FLOW OF LIQUID THROUGH SAID FIELD, MEANS INSULATING THE INTERIOR OF THE CONDUIT FROM THE LIQUID AT ITS PORTION THREADED BY SAID MAGNETIC FIELD, AND MEANS CONNECTED TO SAID ELECTRODES FOR MEASURING SAID SIGNALS, SAID CONDUIT IN AT LEAST ITS PORTION THREADED BY SAID MAGNETIC FIELD HAVING A WALL THICKNESS OF AT LEAST ONE-QUARTER INCH AND BEING OF ALUMINUM WHEREBY SAID PORTION OF THE CONDUIT HAS LARGE EDDY CURRENTS PRODUCED THEREIN BY THE ALTERNATING MAGNETIC FIELD TO PRODUCE HEATING TO AVOID ACCUMULATION OF GREASE ON THE ELECTRODES.
Claim 2
Dependent Claim
147 words
A FLOWMETER COMPRISING A METALLIC CONDUIT FOR FLOWING LIQUID, ELECTROMAGNETIC MEANS PROVIDING AN ALTERNATING MAGNETIC FIELD TRANSVERSE TO SAID CONDUIT AND THREADING SAID CONDUIT, MEANS SUPPLYING ALTERNATING CURRENT TO SAID ELECTROMAGNETIC MEANS, ELECTRODES INSULATED FROM SAID CONDUIT, EXPOSED TO LIQUID FLOWING THROUGH SAID CONDUIT, AND LOCATED ON A LINE EXTENDING TRANSVERSELY THROUGH SAID FIELD TO PICK UP SIGNALS GENERATED BY FLOW OF LIQUID THROUGH SAID FIELD, MEANS INSULATING THE INTERIOR OF THE CONDUIT FROM THE LIQUID AT ITS PORTION THREADED BY SAID MAGNETIC FIELD, AND MEANS CONNECTED TO SAID ELECTRODES FOR MEASURING SAID SIGNALS, SAID CONDUIT IN AT LEAST ITS PORTION THREADED BY SAID MAGNETIC FIELD HAVING A WALL THICKNESS OF AT LEAST ONE-QUARTER INCH AND BEING OF ALUMINUM WHEREBY SAID PORTION OF THE CONDUIT HAS LARGE EDDY CURRENTS PRODUCED THEREIN BY THE ALTERNATING MAGNETIC FIELD TO PRODUCE HEATING TO AVOID ACCUMULATION OF GREASE ON THE ELECTRODES.
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |