Patent US2621448A successfully refreshed from Google Patents.
US2621448A
Expired / Lapsed
US
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Automatic feed for die machining apparatus
Assignee: United States Steel Corp
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Filing: 1951-07-03
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Granted: 1952-12-16
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Expires: 1971-07-03
Abstract
No abstract record available.
Inventors
- 👤 Marshall H Macmeans
- 👤 Clarence J Oberdoerster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:26
CPC Classifications
B; B24; B24B; B24B5/00; B24B5/36; B24B5/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US556054A
Cited
US1570156A
Cited
US1946429A
Cited
US2191930A
Cited
US2391983A
Cited
US2462327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |