US2951940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of ascertaining the presence of petroleum deposits in earth formations
Assignee: Jersey Production Research Co
•
Filing: 1957-03-01
•
Granted: 1960-09-06
•
Expires: 1977-03-01
Abstract
No abstract record available.
Inventors
- 👤 John W Graham
- 👤 Joseph S Osoba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:19
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD FOR DETERMINING THE PRESENCE OF PETROLEUM IN AN EARTH FORMATION PENETRATED BY A BOREHOLE COMPRISING THE FOLLOWING STEPS: WHILE DRILLING SAID BOREHOLE, USING DRILLING FLUID FROM WHICH FLUORESCENT MATERIALS HAVE BEEN EXCLUDED, OBTAINING A SAMPLE OF SAID EARTH FORMATION AND DIVIDING IT INTO TWO PIECES, CONTACTING THE SURFACE OF ONE OF SAID SAMPLES WITH A NON-FLUORESCENT SOLUTION CONTAINING A CATIONIC SURFACE ACTIVE AGENT WHICH CAUSES PREFERENTIAL WETTING OF SAID SURFACE BY PETROLEUM PRESENT THEREIN, EXPOSING SAID SAMPLES TO ULTRA-VIOLET LIGHT, AND COMPARING THE RELATIVE FLUORESCENCE OF THE SURFACES OF SAID SAMPLES.
Claim 2
Independent Claim
93 words
A METHOD FOR DETERMINING THE PRESENCE OF PETROLEUM IN AN EARTH FORMATION PENETRATED BY A BOREHOLE COMPRISING THE FOLLOWING STEPS: WHILE DRILLING SAID BOREHOLE, USING DRILLING FLUID FROM WHICH FLUORESCENT MATERIALS HAVE BEEN EXCLUDED, OBTAINING A SAMPLE OF SAID EARTH FORMATION AND DIVIDING IT INTO TWO PIECES, CONTACTING THE SURFACE OF ONE OF SAID SAMPLES WITH A NON-FLUORESCENT SOLUTION CONTAINING A CATIONIC SURFACE ACTIVE AGENT WHICH CAUSES PREFERENTIAL WETTING OF SAID SURFACE BY PETROLEUM PRESENT THEREIN, EXPOSING SAID SAMPLES TO ULTRA-VIOLET LIGHT, AND COMPARING THE RELATIVE FLUORESCENCE OF THE SURFACES OF SAID SAMPLES.
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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) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |