US2679381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal rock piercing apparatus with automatic control
Assignee: Union Carbide Corp
•
Filing: 1950-12-28
•
Granted: 1954-05-25
•
Expires: 1970-12-28
Abstract
No abstract record available.
Inventors
- 👤 Stanley H Royer
- 👤 Alfred J Miller
- 👤 Rudolph F Hinschlager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:41
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE22964E
Cited
US2030007A
Cited
US2372963A
Cited
US2418220A
Cited
US2411737A
Cited
US2534958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |