US3028922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Face drill
Assignee: Marmon Herrington Co
•
Filing: 1959-03-20
•
Granted: 1962-04-10
•
Expires: 1979-03-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles P Hudnall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:14
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US658008A
Cited
US882878A
Cited
FR472362A
Cited
US2338351A
Cited
US2788194A
Cited
US2807441A
Cited
US2835472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |