Patent US3279252A successfully refreshed from Google Patents.
US3279252A
Expired / Lapsed
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Level sensing apparatus
Assignee: Monsanto Co
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Filing: 1963-09-18
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Granted: 1966-10-18
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Expires: 1983-09-18
Abstract
No abstract record available.
Inventors
- 👤 Barlow Paul Desmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:23
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/246
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
LIQUID LEVEL SENSING APPARATUS, COMPRISING IN COMBINATION: (A) A CONDUCTIVE WALL DEFINING AN ELECTRICALLY CONDUCTIVE TUBULAR MEMBER HAVING A CLOSED LOWER END, (B) HEATING MEANS FOR PASSING AN ELECTRICAL CURRENT THROUGH SAID WALL WHEREBY SAID MEMBER IS HEATED BY CURRENT FLOWING THROUGH SAID WALL, AND (C) A PLURALITY OF VERTICALLY SPACED TEMPERATURE SENSING MEANS MOUNTED INSIDE SAID TUBULAR MEMBER IN DIRECT CONTACT WITH SAID WALL.
Claim 2
Dependent Claim
65 words
LIQUID LEVEL SENSING APPARATUS, COMPRISING IN COMBINATION: (A) A CONDUCTIVE WALL DEFINING AN ELECTRICALLY CONDUCTIVE TUBULAR MEMBER HAVING A CLOSED LOWER END, (B) HEATING MEANS FOR PASSING AN ELECTRICAL CURRENT THROUGH SAID WALL WHEREBY SAID MEMBER IS HEATED BY CURRENT FLOWING THROUGH SAID WALL, AND (C) A PLURALITY OF VERTICALLY SPACED TEMPERATURE SENSING MEANS MOUNTED INSIDE SAID TUBULAR MEMBER IN DIRECT CONTACT WITH SAID WALL.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |