US2197571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bore hole exploring apparatus
Assignee: Sperry Sun Well Surveying Co
•
Filing: 1938-10-03
•
Granted: 1940-04-16
•
Expires: 1958-10-03
Abstract
No abstract record available.
Inventors
- 👤 John W Millington
- 👤 William T Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/04; G; G01; G01V; G01V11/00; G01V11/002
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-04-16 | 1943-10-16 | 1944-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-16 | 1947-10-16 | 1948-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-16 | 1951-10-16 | 1952-04-16 | $7700.00 | Window Closed / Lapsed |