Patent US2759232A successfully refreshed from Google Patents.
US2759232A
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Process of removing wax, plastic, and like pattern materials from thin shell molds
Assignee: Arwood Precision Castings Corp
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Filing: 1953-01-02
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Granted: 1956-08-21
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Demeter Geza
- 👤 James C Johnson
- 👤 Jr Francis X Maher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:14
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C9/043; B22C7/00; B22C7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE PROCESS FOR REMOVING PATTERNS MADE OF WAX, PLASTIC AND THE LIKE FROM SHELL INVESTMENT MOLDS HAVING THIN UNSUPPORTED WALLS FORMED BY DIP-COATING ONE OR MORE TIMES BUT NOT ENOUGH TIMES TO FORM A WALL SUFFICIENTLY STRONG TO WITHSTAND EXPANSION PRESSURES OF THE PATTERN NORMALLY CREATED BY SLOW HEATING COMPRISING IMMERSING THE MOLD CONTAINING THE PATTERN IN A LIQUID HEATED BETWEEN AND INCLUDING THE BOILING POINT OF SAID LIQUID AND AT LEAST THE MELTING POINT OF THE PATTERN MATERIAL, MAINTAINING THE MOLD IN SAID LIQUID FOR A PERIOD SUFFICIENT ONLY TO MELT ENOUGH PATTERN MATERIAL DIRECTLY ADJACENT THE INTERIOR MOLD SURFACE TO PROVIDE FOR EXPANSION OF THE UNMELTED REMAINDER OF THE MOLD MATERIAL WITHOUT CRACKING THE MOLD, REMOVING THE MOLD FROM THE LIQUID, HEATING THE MOLD SUFFICIENTLY TO MELT ALL THE PATTERN MATERIAL, AND REMOVING THE PATTERN MATERIAL.
Claim 2
Dependent Claim
138 words
THE PROCESS FOR REMOVING PATTERNS MADE OF WAX, PLASTIC AND THE LIKE FROM SHELL INVESTMENT MOLDS HAVING THIN UNSUPPORTED WALLS FORMED BY DIP-COATING ONE OR MORE TIMES BUT NOT ENOUGH TIMES TO FORM A WALL SUFFICIENTLY STRONG TO WITHSTAND EXPANSION PRESSURES OF THE PATTERN NORMALLY CREATED BY SLOW HEATING COMPRISING IMMERSING THE MOLD CONTAINING THE PATTERN IN A LIQUID HEATED BETWEEN AND INCLUDING THE BOILING POINT OF SAID LIQUID AND AT LEAST THE MELTING POINT OF THE PATTERN MATERIAL, MAINTAINING THE MOLD IN SAID LIQUID FOR A PERIOD SUFFICIENT ONLY TO MELT ENOUGH PATTERN MATERIAL DIRECTLY ADJACENT THE INTERIOR MOLD SURFACE TO PROVIDE FOR EXPANSION OF THE UNMELTED REMAINDER OF THE MOLD MATERIAL WITHOUT CRACKING THE MOLD, REMOVING THE MOLD FROM THE LIQUID, HEATING THE MOLD SUFFICIENTLY TO MELT ALL THE PATTERN MATERIAL, AND REMOVING THE PATTERN MATERIAL.
References Cited (Backward Citations)
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US2401760A
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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) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |