Patent US2807437A successfully refreshed from Google Patents.
US2807437A
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Method for making intricate hollow powder metal parts
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1952-05-01
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Granted: 1957-09-24
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Expires: 1972-05-01
Abstract
No abstract record available.
Inventors
- 👤 Milton S Roush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:08
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F5/00; B22F5/10; Y; Y10; Y10S; Y10S415/00; Y10S415/914; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49826; Y10T29/49893; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US994166A
Cited
FR878999A
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US2401483A
Cited
US2341860A
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US2514525A
Cited
GB629326A
Cited
GB611650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |