Patent US3572404A successfully refreshed from Google Patents.
US3572404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for metering liquids to tank comprising level sensing controls
Assignee: Wyeth Holdings LLC
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Filing: 1969-04-08
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Granted: 1971-03-23
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Expires: 1989-04-08
Abstract
Abstract LEVEL SENSING PROBES, LOWERED TO RESPECTIVE DIFFERENT LEVELS IN A TANK, CONTROL FLOW OF LIQUID TO THE TANK IN MEASURED VOLUMES DETERMINED BY LIQUID LEVEL IN THE TANK. FIRTH LIQUID FILLS TO LOWER PROBE LEVEL WHEREUPON AUTOMATICALLY FIRST LIQUID FEED IS STOPPED AND SECOND LIQUID FEED IS STARTED AND CONTINUED UNTIL LIQUID REACHES UPPER PROBE LEVEL WHEREUPON AUTOMATICALLY ALL FEED IS STOPPED AND PROBES ARE RAISED AWAY FROM LIQUIDS. RELAY CIRCUITS FOR AUTOMATIC CONTROL AND HOISTING APPARATUS ARE DETAILED.
Inventors
- 👤 William Woodrow Allison
- 👤 James A Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:02
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/001; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/241
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |