US2771141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet wall cleaner
Assignee: Gem Oil Tool Co Inc
•
Filing: 1953-09-03
•
Granted: 1956-11-20
•
Expires: 1973-09-03
Abstract
No abstract record available.
Inventors
- 👤 Lewis Farral Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:49
CPC Classifications
E; E21; E21B; E21B37/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1279333A
Cited
US1721107A
Cited
US1839709A
Cited
US2161283A
Cited
US2235318A
Cited
US2380022A
Cited
US2568087A
Cited
US2659438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |