US2736967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction caliper
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1952-02-09
•
Granted: 1956-03-06
•
Expires: 1972-02-09
Abstract
No abstract record available.
Inventors
- 👤 Doll Henri-Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:16
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/08; E21B47/085; Y; Y10; Y10S; Y10S33/00; Y10S33/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2281960A
Cited
US2299406A
Cited
US2459499A
Cited
US2503851A
Cited
US2534632A
Cited
US2649786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |