Patent US4592018A successfully refreshed from Google Patents.
Patent US3420291A successfully refreshed from Google Patents.
US3420291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing metal casting porosity
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1965-12-29
•
Granted: 1969-01-07
•
Expires: 1985-12-29
Abstract
No abstract record available.
Inventors
- 👤 George D Chandley
- 👤 Stuart Z Uram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:43
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/09; B22D27/13
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |