US2803434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary well drilling machine
Assignee: Individual
•
Filing: 1951-03-20
•
Granted: 1957-08-20
•
Expires: 1971-03-20
Abstract
No abstract record available.
Inventors
- 👤 Heinish George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:24
CPC Classifications
E; E21; E21B; E21B6/00; E21B3/00; E21B3/02; E21B3/022; E21B7/00; E21B7/02; E21B7/021
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1470838A
Cited
US1883070A
Cited
US2049971A
Cited
US2081200A
Cited
US2179316A
Cited
US2169678A
Cited
US2200075A
Cited
US2194066A
Cited
US2223600A
Cited
US2631013A
Cited
US2565224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |