US2807845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shell mold and method of making same
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1953-04-07
•
Granted: 1957-10-01
•
Expires: 1973-04-07
Abstract
No abstract record available.
Inventors
- 👤 John C Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:18
CPC Classifications
B; B22; B22C; B22C23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
GB190013470A
Cited
US1358435A
Cited
GB484930A
Cited
US2081304A
Cited
DE832934C
Cited
US2654925A
Cited
GB683239A
Cited
US2726431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |