US2679669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hollow castings
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1949-09-21
•
Granted: 1954-06-01
•
Expires: 1969-09-21
Abstract
No abstract record available.
Inventors
- 👤 Robert A Kempe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:47
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341; Y10T29/4981
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE METHOD OF MANUFACTURING CASTINGS HAVING VOID PASSAGES THERETHROUGH IN PREDETERMINED CONFIGURATION WHICH COMPRISES FORMING A MOLYBDENUM CORE COATED WITH A CERAMIC MATERIAL INTO A NETWORK HAVING THE CONFIGURATION REQUIRED IN THE VOID PASSAGES, CASTING A HEAT-RESISTANT BODY METAL ABOUT THE COATED CORE, HEATING THE ASSEMBLY WITH THE MOLYBDENUM CORE EXPOSED IN AN OXIDIZING ATMOSPHERE TO A TEMPERATURE SUFFICIENT
Claim 2
Independent Claim
59 words
THE METHOD OF MANUFACTURING CASTINGS HAVING VOID PASSAGES THERETHROUGH IN PREDETERMINED CONFIGURATION WHICH COMPRISES FORMING A MOLYBDENUM CORE COATED WITH A CERAMIC MATERIAL INTO A NETWORK HAVING THE CONFIGURATION REQUIRED IN THE VOID PASSAGES, CASTING A HEAT-RESISTANT BODY METAL ABOUT THE COATED CORE, HEATING THE ASSEMBLY WITH THE MOLYBDENUM CORE EXPOSED IN AN OXIDIZING ATMOSPHERE TO A TEMPERATURE SUFFICIENT
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |