Patent US2491747A successfully refreshed from Google Patents.
US2491747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating means for well-drilling rotaries
Assignee: Oil Well Supply Co
•
Filing: 1948-11-24
•
Granted: 1949-12-20
•
Expires: 1968-11-24
Abstract
No abstract record available.
Inventors
- 👤 August R Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:39
CPC Classifications
F; F16; F16N; F16N7/00; F16N7/14; F16N7/16; F16N7/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2017260A
Cited
US2053929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |