US2819880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drills
Assignee: Individual
•
Filing: 1955-10-03
•
Granted: 1958-01-14
•
Expires: 1975-10-03
Abstract
No abstract record available.
Inventors
- 👤 John E Gilchrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/046; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17042; Y10T403/00; Y10T403/55
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US436558A
Cited
US1943879A
Cited
US2180120A
Cited
US2354656A
Cited
US2512033A
Cited
US2609638A
Cited
US2602672A
Cited
US2569275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |