US2263779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining machine
Assignee: Jeffrey Manufacturing Co
•
Filing: 1938-05-06
•
Granted: 1941-11-25
•
Expires: 1958-05-06
Abstract
No abstract record available.
Inventors
- 👤 Robert K Jeffrey
- 👤 Lewis E Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:11
CPC Classifications
E; E21; E21C; E21C31/00; E21C31/08; Y; Y10; Y10S; Y10S74/00; Y10S74/11; Y10T; Y10T74/00; Y10T74/19; Y10T74/19019
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-11-24 | 1945-05-26 | 1945-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-11-24 | 1949-05-26 | 1949-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-11-24 | 1953-05-26 | 1953-11-25 | $7700.00 | Window Closed / Lapsed |