US2854218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ice shaving drill bit
Assignee: Individual
•
Filing: 1957-03-11
•
Granted: 1958-09-30
•
Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 James R Hedrick
- 👤 Alfred A Leukuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:34
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/008; E21B11/00; E21B11/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1172065A
Cited
US2121202A
Cited
GB449974A
Cited
US2393282A
Cited
US2504978A
Cited
US2508230A
Cited
US2578014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |