US2747402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure well logging
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1951-09-27
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Granted: 1956-05-29
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Expires: 1971-09-27
Abstract
No abstract record available.
Inventors
- 👤 Doll Henri-Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:24
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
APPARTUS FOR WELL LOGGING COMPRISING A PAD MOVABLE IN A BOREHOLE, A LATERALLY PROJECTING SURFACE PORTION ON SAID PAD DELIMITED BY CUTTING EDGES, A PORT IN SAID SURFACE PORTION, A MANOMETER COUPLED BETWEEN SAID PORT AND THE INTERIOR OF THE BOREHOLE, AND MEANS FOR FORCING SAID PAD AGAINST THE WALL OF THE BOREHOLE TO BRING AT LEAST SAID SURFFACE PORTION THEREOF INTO RELATIVELY FLUID-THIGHT ENGAGEMENT WITH THE WALL OF THE BOREHOLE, WHEREBY THE
Claim 2
Dependent Claim
73 words
APPARTUS FOR WELL LOGGING COMPRISING A PAD MOVABLE IN A BOREHOLE, A LATERALLY PROJECTING SURFACE PORTION ON SAID PAD DELIMITED BY CUTTING EDGES, A PORT IN SAID SURFACE PORTION, A MANOMETER COUPLED BETWEEN SAID PORT AND THE INTERIOR OF THE BOREHOLE, AND MEANS FOR FORCING SAID PAD AGAINST THE WALL OF THE BOREHOLE TO BRING AT LEAST SAID SURFFACE PORTION THEREOF INTO RELATIVELY FLUID-THIGHT ENGAGEMENT WITH THE WALL OF THE BOREHOLE, WHEREBY THE
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US2400678A
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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) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |