US2825535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool-guide
Assignee: Caterpillar Global Mining LLC
•
Filing: 1953-03-13
•
Granted: 1958-03-04
•
Expires: 1973-03-13
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Thornburg
- 👤 Irwin C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:09
CPC Classifications
E; E21; E21B; E21B1/00; E21B1/02; E21B1/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1048632A
Cited
US1049068A
Cited
US1162144A
Cited
US2049971A
Cited
US2108057A
Cited
US2169678A
Cited
US2386281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |