US2633233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawing machine
Assignee: National Steel Corp
•
Filing: 1947-09-09
•
Granted: 1953-03-31
•
Expires: 1967-09-09
Abstract
No abstract record available.
Inventors
- 👤 Lee R Berkebil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:29
CPC Classifications
B; B21; B21C; B21C19/00; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5187
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US191100A
Cited
US524508A
Cited
US886717A
Cited
US524504A
Cited
US637466A
Cited
US1298999A
Cited
US1940354A
Cited
US2199602A
Cited
US2155437A
Cited
US2154392A
Cited
US2404234A
Cited
US2363406A
Cited
US2360746A
Cited
US2434006A
Cited
US2492544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |