US2611664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borehole apparatus centering guide
Assignee: Sperry Sun Well Surveying Co
•
Filing: 1946-02-16
•
Granted: 1952-09-23
•
Expires: 1966-02-16
Abstract
No abstract record available.
Inventors
- 👤 Gottdank L Kothny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:17
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028; E21B17/1042; Y; Y10; Y10T; Y10T82/00; Y10T82/27
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |