US3196506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a shell mold by lost wax process
Assignee: Howmet Turbine Components Corp
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Filing: 1960-11-08
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Granted: 1965-07-27
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Expires: 1980-11-08
Abstract
No abstract record available.
Inventors
- 👤 Operhall Theodore
- 👤 Charles W Schwartz
- 👤 Dickson Van Schoik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:59
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN THE METHOD OF PRODUCING A SHELL MOLD FOR METAL CASTING, THE STEPS OF COATING A PATTERN OF HEAT-DISPOSABLE MATERIAL WITH A SLURRY OF A FINELY DIVIDED CERAMIC SELECTED FROM THE GROUP CONSISTING OF ZIRCON, ALUMINA, TITANIA, THORIA, CHROMITE, SILIMANITE, MULLITE AND MAGNESIA, AND CHARACTERIZED BY SMALL INVERSIONS BY COMPARSION WITH SILICA DURING HEATING FROM AMBIENT TEMPERATURE TO A TEMPERATURE OF ABOUT 2000*F. WHEREBY MINIMUM EXPANSIONS TAKE PLACE, STOCCOING THE COATED PATTERN WITH PARTICULATE CERAMIC MATERIALS SELECTED FROM THE GROUP CONSISTING OF ALUMINA AND ZIRCON, AND CHARACTERIZED BY SMALL INVERSIONS BY COMPARSION WITH SILICA DURING HEATING FROM AMBIENT TEMPERATURE TO ABOUT 2000*F. WHEREBY MINIMUM EXPANSIONS OCCUR, REPEATED THE COATING OF THE PATTERN ALTERNATELY WITH THE SLURRY AND STUCCO TO BUILD UP A SHELL OF CERAMIC MATERIAL CHARACTERIZED BY LOW INVERSION DURING HEATING
Claim 2
Dependent Claim
132 words
IN THE METHOD OF PRODUCING A SHELL MOLD FOR METAL CASTING, THE STEPS OF COATING A PATTERN OF HEAT-DISPOSABLE MATERIAL WITH A SLURRY OF A FINELY DIVIDED CERAMIC SELECTED FROM THE GROUP CONSISTING OF ZIRCON, ALUMINA, TITANIA, THORIA, CHROMITE, SILIMANITE, MULLITE AND MAGNESIA, AND CHARACTERIZED BY SMALL INVERSIONS BY COMPARSION WITH SILICA DURING HEATING FROM AMBIENT TEMPERATURE TO A TEMPERATURE OF ABOUT 2000*F. WHEREBY MINIMUM EXPANSIONS TAKE PLACE, STOCCOING THE COATED PATTERN WITH PARTICULATE CERAMIC MATERIALS SELECTED FROM THE GROUP CONSISTING OF ALUMINA AND ZIRCON, AND CHARACTERIZED BY SMALL INVERSIONS BY COMPARSION WITH SILICA DURING HEATING FROM AMBIENT TEMPERATURE TO ABOUT 2000*F. WHEREBY MINIMUM EXPANSIONS OCCUR, REPEATED THE COATING OF THE PATTERN ALTERNATELY WITH THE SLURRY AND STUCCO TO BUILD UP A SHELL OF CERAMIC MATERIAL CHARACTERIZED BY LOW INVERSION DURING HEATING
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |