Patent US3200455A successfully refreshed from Google Patents.
US3200455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of shell mold casting
Assignee: Howmet Turbine Components Corp
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Filing: 1962-04-04
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Granted: 1965-08-17
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Expires: 1982-04-04
Abstract
No abstract record available.
Inventors
- 👤 Operhall Theodore
- 👤 Yaker Charles
- 👤 Daniel B Rapoport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:34
CPC Classifications
B; B22; B22C; B22C23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN THE PROCESS OF METAL CASTING WITH SHELL MOLDS HAVING CERAMIC WALLS OF RELATIVELY THIN CROSS-SECTION FOR HEAT TRANSFER THERETHROUGH AT A RELATIVELY HIGH RATE, THE STEPS OF PREHEATING THE SHELL MOLD, PREHEATING AN INSULATION FLASK HAVING AN OPEN TOP IN COMMUNICTION WITH A CENTRAL OPENING HAVING CROSSWIDE DMENSIONS GREATER THAN THE CROSSWISE DIMENSIONS OF THE SHELL MOLD AND A DEPTH SLIGHTLY LESS THAN THE OVERALL DEPTH OF THE SHELL MOLD, INSERTING THE PREHEATED SHELL MOLD INTO THE PREHEATED INSULATION FLASK, TRANSFERRING THE PREHEATED FLASK WITH THE PREHEATED SHELL MOLD THEREIN TO THE POSITION FOR METAL POURING, POURING THE MOLTEN METAL INTO THE PREHEATED SHELL MOLD WHILE IN THE PREHEATED INSULATION FLASK, SEPARATING THE SHELL MOLD AND THE INSULATION FLASK AFTER THE METAL HAS BEEN POURED, AND COOLING THE METAL CAST IN THE SHELL MOLD WHILE THE MOLD IS OUSIDE OF THE INSULATION FLASK
Claim 2
Dependent Claim
144 words
IN THE PROCESS OF METAL CASTING WITH SHELL MOLDS HAVING CERAMIC WALLS OF RELATIVELY THIN CROSS-SECTION FOR HEAT TRANSFER THERETHROUGH AT A RELATIVELY HIGH RATE, THE STEPS OF PREHEATING THE SHELL MOLD, PREHEATING AN INSULATION FLASK HAVING AN OPEN TOP IN COMMUNICTION WITH A CENTRAL OPENING HAVING CROSSWIDE DMENSIONS GREATER THAN THE CROSSWISE DIMENSIONS OF THE SHELL MOLD AND A DEPTH SLIGHTLY LESS THAN THE OVERALL DEPTH OF THE SHELL MOLD, INSERTING THE PREHEATED SHELL MOLD INTO THE PREHEATED INSULATION FLASK, TRANSFERRING THE PREHEATED FLASK WITH THE PREHEATED SHELL MOLD THEREIN TO THE POSITION FOR METAL POURING, POURING THE MOLTEN METAL INTO THE PREHEATED SHELL MOLD WHILE IN THE PREHEATED INSULATION FLASK, SEPARATING THE SHELL MOLD AND THE INSULATION FLASK AFTER THE METAL HAS BEEN POURED, AND COOLING THE METAL CAST IN THE SHELL MOLD WHILE THE MOLD IS OUSIDE OF THE INSULATION FLASK
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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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |