US3324933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal casting
Assignee: Babcock and Wilcox Co
•
Filing: 1964-06-02
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Granted: 1967-06-13
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Expires: 1984-06-02
Abstract
No abstract record available.
Inventors
- 👤 Daniel C Shewmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:05
CPC Classifications
B; B22; B22D; B22D13/00; B22D13/02; B22D11/00; B22D11/10; B22D11/11; B22D11/111; B22D27/00; B22D27/04; B22D27/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
88 words
THE METHOD OF CENTRIFUGALLY CASTING METALLIC TUBULAR ARTICLES IN A ROTARY MOLD WHICH COMPRISES (A) INTRODUCING MOLTEN METAL CONTAINING GASEOUS IMPURITIES INTO SAID MOLD WHILE THE MOLD IS ROTATING TO FORM BY CENTRIFUGAL ACTION A TUBULAR SOLIDIFYING MASS OF MOLTEN METAL TENDING TO SOLIDIFY INITIALLY AT ITS OUTER AND INNER SURFACES AND TO THEREBY ENTRAP GASEOUS IMPURITIES IN SAID MASS, AND (B) MAINTAINING AN INNER LAYER OF SAID METAL MASS IN MOLTEN CONDITION FOR A LENGTH OF TIME SUFFICIENT TO PERMIT SUBSTANTIALLY ALL OF THE GASEOUS IMPURITIES IN
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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) | 1970-06-12 | 1970-12-12 | 1971-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-12 | 1974-12-12 | 1975-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-12 | 1978-12-12 | 1979-06-13 | $7700.00 | Window Closed / Lapsed |