US2557488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for and method of determining permeability of earth formations penetrated by well bores
Assignee: Phillips Petroleum Co
•
Filing: 1947-03-28
•
Granted: 1951-06-19
•
Expires: 1967-03-28
Abstract
No abstract record available.
Inventors
- 👤 White Charley Leamond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:52
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/04; E21B47/047
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
APPARATUS FOR DETERMINING AN INTERFACE BETWEEN TWO IMMISCIBLE LIQUIDS OF DIFFERENT DENSITIES COMPRISING IN COMBINATION A FLOAT OF A DENSITY INTERMEDIATE THE DENSITY OF THE TWO LIQUIDS AND ADAPTED TO ASSUME A POSITION GENERALLY CORRESPONDING TO THE INTERFACE, A REEL, A MEASURING LINE WOUND ON SAID REEL AND SECURED TO SAID FLOAT, AND A SCALE FOR WEIGHTING THE UNREELED PORTION OF SAID FLOAT AND ATTACHED MEASURING LINE.
References Cited (Backward Citations)
US1272605A
Cited
US1344663A
Cited
US1695701A
Cited
US1982970A
Cited
US2139810A
Cited
US2413435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |