US3257692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphite shell molds and method of making
Assignee: Howmet Turbine Components Corp
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Filing: 1964-10-28
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Granted: 1966-06-28
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Expires: 1984-10-28
Abstract
No abstract record available.
Inventors
- 👤 Operhall Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:39
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
150 words
A METAL CASTING PROCESS FOR PRODUCING GROUP IV-B METAL OBJECTS WHICH COMPRISES COATING AN EXPENDABLE PATTERN WITH A SERIES OF ALTERNATING DIP COATS AND STUCCO COATS TO BUILD UP A SHELL MOLD OF DESIRED WALL THICKNESS ABOUT THE PATTERN IN WHICH THE SOLIDS OF THE FIRST ONE TO THREE DIP COATS APPLIED TO THE PATTERN CONSIST OF AT LEAST 99% BY WEIGHT OF GRAPHITE AND IN WHICH THE FIRST ONE TO THREE STUCCCO COATS CONSIST OF GRAPHITE WHEREBY THE INNER PORTIONS OF THE SHELL MOLD DISPOSED ABOUT THE MOLD PATTERN CONSIST ESSENTIALLY OF GRAPHITE REMOVING THE PATTERN FROM THE MOLD UNDER NON-OXIDING CONDITIONS WHEREBY THE GRAPHITE IS MAINTAINED TO DEFINE THE INNER PORTION OF THE MOLD, POURING THE GROUP IV METALS IN THE MOLD UNDER NON-OXIDING CONDITIONS AND MAINTAINING THE NON-OXIDIZING CONDITIONS UNTIL THE METAL HAS BEEN SET IN THE MOLD AND THEN REMOVING THE METAL OBJECT FROM THE MOLD.
References Cited (Backward Citations)
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Cited
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Cited
US2682692A
Cited
GB752742A
Cited
US2829060A
Cited
US2886869A
Cited
US3114948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |