Patent US2621380A successfully refreshed from Google Patents.
US2621380A
Expired / Lapsed
US
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Piston casting machine
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1949-11-16
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Granted: 1952-12-16
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Expires: 1969-11-16
Abstract
No abstract record available.
Inventors
- 👤 Townhill Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:34
CPC Classifications
B; B22; B22D; B22D15/00; B22D15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US590148A
Cited
US1551193A
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US1912606A
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US1952199A
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US2287524A
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US2286994A
Cited
US2527537A
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 |