US2488070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weight indicator and drilling line anchor
Assignee: National Supply Co
•
Filing: 1945-01-15
•
Granted: 1949-11-15
•
Expires: 1965-01-15
Abstract
No abstract record available.
Inventors
- 👤 John D Spalding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:16
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE404558C
Cited
US1692057A
Cited
US2024147A
Cited
US2025928A
Cited
US1991826A
Cited
US2022203A
Cited
US1995996A
Cited
US2187345A
Cited
US2079021A
Cited
US2210759A
Cited
US2282685A
Cited
US2352934A
Cited
US2392702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-14 | 1953-05-16 | 1953-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-14 | 1957-05-16 | 1957-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-14 | 1961-05-16 | 1961-11-15 | $7700.00 | Window Closed / Lapsed |