US2575438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion drill bit body
Assignee: Kennametal Inc
•
Filing: 1949-09-28
•
Granted: 1951-11-20
•
Expires: 1969-09-28
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Alexander
- 👤 John H Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:33
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17761; Y10T279/17837
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US455963A
Cited
GB190310750A
Cited
US993972A
Cited
US1359318A
Cited
US1468774A
Cited
US1718462A
Cited
US2101376A
Cited
US2205238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |