US2912731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for casting group iv metals
Assignee: Individual
•
Filing: 1956-08-02
•
Granted: 1959-11-17
•
Expires: 1976-08-02
Abstract
No abstract record available.
Inventors
- 👤 Helen E Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:57
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A METHOD FOE CASTING A HIGHLY REFACTORY GROUP IV METAL COMPRISING PREHEATING A MOLD TO A TEMPERATURE OF BETWEEN 1070* F. AND THE MELTING POINT OF HE METAL TO BE CAST, SAID MOLD BEING MADE FROM A REFACTORY MATERIAL STABLE AT TEMPERATURE ABOVE THE MELTING POINT OF SAID METAL, FEEDING SAID METAL FROM A SOUURCE OUTSIDE SAID MOLD RAPIDLY IN MOLTEN FORM INTO SAID PREHEATED MOLD WHILE THE SURFACE OF SAID MOLD IS AT SAID PREHEATING TEMPERATURE, AND IMMEDIATELY COOLING THE MOLD TO FORM A SKIN ON THE CASTING WITHIN LESS THAN 1 MINUTE AFTER THE MOLTEN METAL CONTACT THE MOLD SURFACE, SAID PREHEATING, FEEDING AND COOLING STEPS BEING CARRIED OUT UNDER A VACUUM.
Claim 2
Independent Claim
114 words
A METHOD FOE CASTING A HIGHLY REFACTORY GROUP IV METAL COMPRISING PREHEATING A MOLD TO A TEMPERATURE OF BETWEEN 1070* F. AND THE MELTING POINT OF HE METAL TO BE CAST, SAID MOLD BEING MADE FROM A REFACTORY MATERIAL STABLE AT TEMPERATURE ABOVE THE MELTING POINT OF SAID METAL, FEEDING SAID METAL FROM A SOUURCE OUTSIDE SAID MOLD RAPIDLY IN MOLTEN FORM INTO SAID PREHEATED MOLD WHILE THE SURFACE OF SAID MOLD IS AT SAID PREHEATING TEMPERATURE, AND IMMEDIATELY COOLING THE MOLD TO FORM A SKIN ON THE CASTING WITHIN LESS THAN 1 MINUTE AFTER THE MOLTEN METAL CONTACT THE MOLD SURFACE, SAID PREHEATING, FEEDING AND COOLING STEPS BEING CARRIED OUT UNDER A VACUUM.
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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) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |