US2812820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fill-up and cementing devices
Assignee: LARKIN PACKER Co
•
Filing: 1953-05-26
•
Granted: 1957-11-12
•
Expires: 1973-05-26
Abstract
No abstract record available.
Inventors
- 👤 Wayne F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:18
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B2200/00; E21B2200/05; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1669; Y10T137/7722; Y10T137/7781; Y10T137/7834
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1072334A
Cited
US1818508A
Cited
US2211846A
Cited
US2592325A
Cited
US2630178A
Cited
US2642140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |