US3279006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing composite castings
Assignee: MARTIN METALS CO
•
Filing: 1963-12-30
•
Granted: 1966-10-18
•
Expires: 1983-12-30
Abstract
No abstract record available.
Inventors
- 👤 Charles W Schwartz
- 👤 Harold L Wheaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:14
CPC Classifications
B; B22; B22D; B22D18/00; B22D18/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A METHOD OF FORMING COMPOSITE METALLIC OBJECTS COMPRISING HEATING A REFRACTORY MOLD HAVING A CAVITY THEREIN AND HAVING A SOLID METALLIC ELEMENT POSITIONED THEREIN WHICH FILLS ONLY A PORTION OF SAID CAVITY, TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 1000*F. AND THE TEMPERATURE OF INCIPIENT MELTING OF THE METALLIC ELEMENT BUT BELOW THE SLUMP TEMPERATURE OF THE MOLD WHILE THE MOLD IS SUBJECTED TO A VACUUM OF LESS THAN 100 MICRONS, ESTABLISHING A TEMPERATURE LEVEL FOR THE TREATED MOLD AT WHICH THERE IS A TEMPERATURE DIFFERENTIAL IN THE RANGE BETWEEN ABOUT 200*F. AND 2000*F. BETWEEN THE TEMPERATURE OF THE TREATED MOLD AND THE TEMPERATURE OF METAL TO BE POURED, SAID TEMPERATURE DIFFERENTIAL BEING OF A MAGNITUDE EFFECTIVE TO PREVENT EXCESSIVE DIFFUSION OF AN ELEMENT BEYOND A BONDING LAYER, POURING THE MOLTEN METAL INTO THE TREATED MOLD TO CONTACT AND TO BOND TO SAID METALLIC ELEMENT WHILE THE METAL AND THE MOLD ARE MAINTAINED UNDER VACUUM AND MAINTAINING VACUUM ON SAID MOLD UNTIL THE CAST METAL IS SOLIDIFIED.
Claim 2
Independent Claim
168 words
A METHOD OF FORMING COMPOSITE METALLIC OBJECTS COMPRISING HEATING A REFRACTORY MOLD HAVING A CAVITY THEREIN AND HAVING A SOLID METALLIC ELEMENT POSITIONED THEREIN WHICH FILLS ONLY A PORTION OF SAID CAVITY, TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 1000*F. AND THE TEMPERATURE OF INCIPIENT MELTING OF THE METALLIC ELEMENT BUT BELOW THE SLUMP TEMPERATURE OF THE MOLD WHILE THE MOLD IS SUBJECTED TO A VACUUM OF LESS THAN 100 MICRONS, ESTABLISHING A TEMPERATURE LEVEL FOR THE TREATED MOLD AT WHICH THERE IS A TEMPERATURE DIFFERENTIAL IN THE RANGE BETWEEN ABOUT 200*F. AND 2000*F. BETWEEN THE TEMPERATURE OF THE TREATED MOLD AND THE TEMPERATURE OF METAL TO BE POURED, SAID TEMPERATURE DIFFERENTIAL BEING OF A MAGNITUDE EFFECTIVE TO PREVENT EXCESSIVE DIFFUSION OF AN ELEMENT BEYOND A BONDING LAYER, POURING THE MOLTEN METAL INTO THE TREATED MOLD TO CONTACT AND TO BOND TO SAID METALLIC ELEMENT WHILE THE METAL AND THE MOLD ARE MAINTAINED UNDER VACUUM AND MAINTAINING VACUUM ON SAID MOLD UNTIL THE CAST METAL IS SOLIDIFIED.
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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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |