US3158912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled grain size casting method
Assignee: General Electric Co
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Filing: 1962-08-09
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Granted: 1964-12-01
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Expires: 1982-08-09
Abstract
No abstract record available.
Inventors
- 👤 Wilbur H Schweikert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:40
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C23/00; B22C23/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN A METHOD OF CASTING AN ARTICLE IN AN INVESTMENT CASTING MOLD, THE STEPS OF: PRODUCING A LINING PORTION OF AN INVESTMENT CASTING MOLD HAVING A LINING SURFACE TO CONFINE MOLTEN METAL FROM A SLURRY CONSISTING ESSENTIALLY OF ABOUT 1-5% BY VOLUME OF A METAL COMPOUND REDUCIBLE TO A FREE METAL AT A TEMPERATURE NO HIGHER THAN THE POURING TEMPERATURE OF THE CASTING METAL, THE METAL ELEMENT OF THE REDUCIBLE METAL COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF IRON, COLBALT, NICKEL, AND MANGANESE, THE BALANCE OF THE SLURRY BEING MOLD MATERIAL; AND THEN, AT THE TIME OF POURING, REDUCING THE METAL COMPOUND ON THE LINING SURFACE OF THE MOLD TO FREE METAL IN A FINELY DIVIDED, DISCRETE STATE WHEREBY THE FREE METAL IS AVAILABLE AS METALLIC NUCLEI FOR THE FORMATION OF FINE METAL GRAINS ON CONTACT WITH THE MOLTEN METAL SUBSEQUENTLY CAST INTO THE MOLD.
Claim 2
Dependent Claim
146 words
IN A METHOD OF CASTING AN ARTICLE IN AN INVESTMENT CASTING MOLD, THE STEPS OF: PRODUCING A LINING PORTION OF AN INVESTMENT CASTING MOLD HAVING A LINING SURFACE TO CONFINE MOLTEN METAL FROM A SLURRY CONSISTING ESSENTIALLY OF ABOUT 1-5% BY VOLUME OF A METAL COMPOUND REDUCIBLE TO A FREE METAL AT A TEMPERATURE NO HIGHER THAN THE POURING TEMPERATURE OF THE CASTING METAL, THE METAL ELEMENT OF THE REDUCIBLE METAL COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF IRON, COLBALT, NICKEL, AND MANGANESE, THE BALANCE OF THE SLURRY BEING MOLD MATERIAL; AND THEN, AT THE TIME OF POURING, REDUCING THE METAL COMPOUND ON THE LINING SURFACE OF THE MOLD TO FREE METAL IN A FINELY DIVIDED, DISCRETE STATE WHEREBY THE FREE METAL IS AVAILABLE AS METALLIC NUCLEI FOR THE FORMATION OF FINE METAL GRAINS ON CONTACT WITH THE MOLTEN METAL SUBSEQUENTLY CAST INTO THE MOLD.
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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |