Patent US2689990A successfully refreshed from Google Patents.
US2689990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugally cast product and method of making same
Assignee: United States Pipe and Foundry Co LLC
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Filing: 1951-03-03
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Granted: 1954-09-28
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Expires: 1971-03-03
Abstract
No abstract record available.
Inventors
- 👤 Martin L Samuels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:01
CPC Classifications
B; B22; B22D; B22D13/00; B22D13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
THE METHOD OF CASTING A WHITE CAST IRON TUBULAR BODY COMPRISING ROTATING A CYLINDRICAL METAL MOLD SUPPORTED SUBSTANTIALLY HORIZONTALLY FOR ROTATION ABOUT ITS LONGITUDINAL AXIS, AT A SPEED WHICH WILL IMPOSE A CENTRIFUGAL FORCE MEASURED AT THE INNER WALL SURFACE OF SAID MOLD OF AT LEAST 125 TIMES GRAVITY ON MOLTEN IRON INTRODUCED INTO SAID MOLD, INTRODUCING INTO SAID ROTATING MOLD A CHARGE OF MOLTEN CAST IRON AT SUCH A RATE THAT SUBSTANTIALLY SAID ENTIRE CHARGE IS INTRODUCED INTO SAID MOLD BEFORE ANY APPRECIABLE FREEZING OF SAID CHARGE TAKES PLACE, THE CHARGE OF MOLTEN CAST IRON BEING OF A QUANTITY SUFFICIENT TO YIELD A TUBULAR CASTING HAVING A WALL THICKNESS OF AT LEAST ONE-HALF INCH AS CAST AND OF A COMPOSITION WHICH WILL FREEZE IN SAID MOLD ENTIRELY AS WHITE IRON, AND MAINTAINING SAID ROTATIONAL SPEED OF THE MOLD THROUGHOUT SUBSTANTIALLY THE ENTIRE TIME THAT SAID MOLTEN IRON IS FREEZING THEREIN.
Claim 2
Independent Claim
151 words
THE METHOD OF CASTING A WHITE CAST IRON TUBULAR BODY COMPRISING ROTATING A CYLINDRICAL METAL MOLD SUPPORTED SUBSTANTIALLY HORIZONTALLY FOR ROTATION ABOUT ITS LONGITUDINAL AXIS, AT A SPEED WHICH WILL IMPOSE A CENTRIFUGAL FORCE MEASURED AT THE INNER WALL SURFACE OF SAID MOLD OF AT LEAST 125 TIMES GRAVITY ON MOLTEN IRON INTRODUCED INTO SAID MOLD, INTRODUCING INTO SAID ROTATING MOLD A CHARGE OF MOLTEN CAST IRON AT SUCH A RATE THAT SUBSTANTIALLY SAID ENTIRE CHARGE IS INTRODUCED INTO SAID MOLD BEFORE ANY APPRECIABLE FREEZING OF SAID CHARGE TAKES PLACE, THE CHARGE OF MOLTEN CAST IRON BEING OF A QUANTITY SUFFICIENT TO YIELD A TUBULAR CASTING HAVING A WALL THICKNESS OF AT LEAST ONE-HALF INCH AS CAST AND OF A COMPOSITION WHICH WILL FREEZE IN SAID MOLD ENTIRELY AS WHITE IRON, AND MAINTAINING SAID ROTATIONAL SPEED OF THE MOLD THROUGHOUT SUBSTANTIALLY THE ENTIRE TIME THAT SAID MOLTEN IRON IS FREEZING THEREIN.
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) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |