US2639895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-propelled drilling machine
Assignee: CHARLES BITNER
•
Filing: 1951-03-23
•
Granted: 1953-05-26
•
Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 Richard L Gallo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:09
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/025
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US7972A
Cited
US1098014A
Cited
US2048072A
Cited
US2044878A
Cited
US2268573A
Cited
US2271821A
Cited
US2365749A
Cited
US2396365A
Cited
US2377279A
Cited
US2389558A
Cited
US2512497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |