US2942578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill
Assignee: Gardner Denver Inc
•
Filing: 1957-04-24
•
Granted: 1960-06-28
•
Expires: 1977-04-24
Abstract
No abstract record available.
Inventors
- 👤 Mervin C Huffman
- 👤 Hjalmer C Gustafson
- 👤 Gustav C Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:42
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1176041A
Cited
US1848340A
Cited
US2003121A
Cited
US2090032A
Cited
US2851251A
Cited
DE937161C
Cited
US2800884A
Cited
US2837317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |