Patent US2551983A successfully refreshed from Google Patents.
US2551983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level indicator of interface between acid and hydrocarbon layers
Assignee: Phillips Petroleum Co
•
Filing: 1945-07-24
•
Granted: 1951-05-08
•
Expires: 1965-07-24
Abstract
No abstract record available.
Inventors
- 👤 Cary R Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:05
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/245; G05; G05D; G05D9/00; G05D9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A LEVEL INDICATOR FOR A CONTAINER FOR TWO FLUIDS IN CONTACT OF DIFFERENT SPECIFIC GRAVITIES AND DIFFERENT ELECTRICAL RESISTIVITIES, COMPRISING IN COMBINATION TWO SPACED ELECTRODES NORMALLY IMMERSED IN SAID FLUIDS RESPECTIVELY MOTOR MEANS TO RAISE AND LOWER THE ELECTRODES, A BRIDGE CIRCUIT CONTAINING SAID ELECTRODES AS ONE RESISTANCE MEANS SUPPLYING CURRENT TO OPPOSITE ENDS OF THE BRIDGE, VACUUM TUBE RELAY MEANS ACTUATED BY UNBALANCE OF SAID BRIDGE ACTUATING SAID MOTOR MEANS TO MOVE SAID ELECTRODES TO RESTORE THE BALANCE TO SAID BRIDGE, AND MEANS BIASING SAID VACUUM TUBE RELAY MEANS TO MAKE THE RELAY LAG IN OPERATION AND AVOID HUNTING.
Claim 2
Dependent Claim
100 words
A LEVEL INDICATOR FOR A CONTAINER FOR TWO FLUIDS IN CONTACT OF DIFFERENT SPECIFIC GRAVITIES AND DIFFERENT ELECTRICAL RESISTIVITIES, COMPRISING IN COMBINATION TWO SPACED ELECTRODES NORMALLY IMMERSED IN SAID FLUIDS RESPECTIVELY MOTOR MEANS TO RAISE AND LOWER THE ELECTRODES, A BRIDGE CIRCUIT CONTAINING SAID ELECTRODES AS ONE RESISTANCE MEANS SUPPLYING CURRENT TO OPPOSITE ENDS OF THE BRIDGE, VACUUM TUBE RELAY MEANS ACTUATED BY UNBALANCE OF SAID BRIDGE ACTUATING SAID MOTOR MEANS TO MOVE SAID ELECTRODES TO RESTORE THE BALANCE TO SAID BRIDGE, AND MEANS BIASING SAID VACUUM TUBE RELAY MEANS TO MAKE THE RELAY LAG IN OPERATION AND AVOID HUNTING.
References Cited (Backward Citations)
DE308939C
Cited
US2032016A
Cited
GB435441A
Cited
US2116636A
Cited
US2104525A
Cited
US2354945A
Cited
US2366694A
Cited
US2376878A
Cited
US2376459A
Cited
US2382516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |