US2641488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for increasing bending fatigue strength of rotary steel drill pipes
Assignee: United States Steel Corp
•
Filing: 1947-11-12
•
Granted: 1953-06-09
•
Expires: 1967-11-12
Abstract
No abstract record available.
Inventors
- 👤 Dunn Jerry Jay
- 👤 William O Clinedinst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
B; B21; B21H; B21H3/00; C; C21; C21D; C21D7/00; C21D7/02; C21D7/04; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; Y; Y10; Y10S; Y10S285/00; Y10S285/916
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US631158A
Cited
US2073093A
Cited
US2188629A
Cited
US2173003A
Cited
US2243608A
Cited
US2261056A
Cited
US2284260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |