US3180141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of investigating earth formations utilizing resistivity and porosity indications
Assignee: Schlumberger Well Surveying Corp
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Filing: 1960-09-09
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Granted: 1965-04-27
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Expires: 1980-09-09
Abstract
No abstract record available.
Inventors
- 👤 Robert P Alger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:03
CPC Classifications
G; G01; G01V; G01V11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A METHOD OF INVESTIGATING A SUBSURFACE EARTH FORMATION TRAVERSED BY A BOREHOLE COMPRISING: OBTAINING AN INDICATION OF THE ELECTRICAL RESISTIVITY OF THE FORMATION; OBTAINING AN INDICATION OF THE POROSITY OF THE FORMATION; AND COMBINING THESE INDICATIONS TO PROVIDE AN INDICATION OF THE MATHEMATICAL PRODUCT OF THE RESISTIVITY TIMES A PREDETERMINED POWER OF THE POROSITY THEREBY TO PROVIDE AN
Claim 2
Independent Claim
58 words
A METHOD OF INVESTIGATING A SUBSURFACE EARTH FORMATION TRAVERSED BY A BOREHOLE COMPRISING: OBTAINING AN INDICATION OF THE ELECTRICAL RESISTIVITY OF THE FORMATION; OBTAINING AN INDICATION OF THE POROSITY OF THE FORMATION; AND COMBINING THESE INDICATIONS TO PROVIDE AN INDICATION OF THE MATHEMATICAL PRODUCT OF THE RESISTIVITY TIMES A PREDETERMINED POWER OF THE POROSITY THEREBY TO PROVIDE AN
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) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |