Flow-indicating device
Abstract
Abstract AN APPARATUS FOR SENSING FLUID FLOW OR THE LACK OF SAME IN A CONDUIT IS DISCLOSED HEREIN. THE APPARATUS COMPRISES A FLUID FLOW CONDUIT MADE OF A HEAT CONDUCTING MATERIAL SUCH AS BRASS, AN ELECTRICAL HEATER MOUNTED IN THERMAL CONTACT ON THE OUTSIDE OF THE CONDUIT, AND AN ELECTRICAL SWITCH RESPONSIVE TO CHANGES IN TEMPERATURE MOUNTED ON THE CONDUIT, WHEREBY AN INCREASE IN THE TEMPERATURE OF THE CONDUIT CAUSES THE ELECTRICAL SWITCH TO TRIP. THE SWITCH IS CONNECTED TO AN INDICATING AND RECORDING DEVICE SUCH AS A CHART WHICH SHOWS THE AMOUNT OF TIME THAT IT IS SWITCHED TO THE HIGH TEMPERATURE LEVEL AND VICE VERSA. IN OPERATION FLOWING THROUGH THE CONDUIT CARRIES AWAY THE HEAT ESTABLISHING A CONDUIT TEMPERATURE WHICH IS INDICATIVE OF A FLOW THROUGH THE CONDUIT. IF NO FLOW OCCURS IN THE CONDUITS, THE CONDUIT RAPIDLY HEATS UP TO A HIGHER TEMPERATURE LEVEL AND CAUSES THE TEMPERATURE SENSING SWITCH TO TRIP, REMOTELY INDICATING TO THE RECORDING DEVICE THAT THE SWITCH IS IN THE NO-FLOW POSITION.
Inventors
- 👤 Wesley M Densmore
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |