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US2792604A
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US
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Method of making shell molds
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1952-06-02
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Granted: 1957-05-21
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Expires: 1972-06-02
Abstract
No abstract record available.
Inventors
- 👤 Kenneth M Bartlett
- 👤 John C Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:49
CPC Classifications
B; B22; B22C; B22C23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB585665A
Cited
US2392968A
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DE832937C
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US2505507A
Cited
US2568364A
Cited
US2544598A
Cited
DE832934C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |