US3206810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic investment shell casting
Assignee: Consolidated Foundries and Manufacturing Corp
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Filing: 1963-07-22
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Granted: 1965-09-21
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Expires: 1983-07-22
Abstract
No abstract record available.
Inventors
- 👤 Hockin John
- 👤 Richard J Charlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:38
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A PROCESS FOR PREPARING AN INVESTMENT CASTING SHELL COMPRISING THE STEPS OF APPLYING TO A PRE-FORMED PATTERN A THIN COATING OF A SLURRY CONSISTING ESSENTIALLY OF MAJOR PROPORTIONS OF PLASTER OF PARIS AND A FNELY-DIVIDED REFRACTORY MATERIAL IN A NON-AQUEOUS LIQUID BINDER CONTAINING HYDROLYZED ETHYL SILICATE, SAID HYDROLYZED ETHYL SILICATE CONTAINING AN AMOUNT OF SILICA WITHIN THE RANGE OF APPROXIMATELY 4 TO 15 PERCENT BY WEIGHT OF TOTAL NONAQUEOUS BINDER, AT LEAST PARTIALLY DRYING SAID COATING AND REPEATING SAID APPLYING AND DRYING STEPS UNTIL A MULTILAYERED SHELL IF FORMED ABOUT SAID PATTERN, AND THEREAFTER CONTACTING SAID SHELL WITH WATER TO HYDRATE THE PLASTER OF PARIS CONTENT OF THE MULTIPLE COATINGS THEREOF.
Claim 2
Dependent Claim
111 words
A PROCESS FOR PREPARING AN INVESTMENT CASTING SHELL COMPRISING THE STEPS OF APPLYING TO A PRE-FORMED PATTERN A THIN COATING OF A SLURRY CONSISTING ESSENTIALLY OF MAJOR PROPORTIONS OF PLASTER OF PARIS AND A FNELY-DIVIDED REFRACTORY MATERIAL IN A NON-AQUEOUS LIQUID BINDER CONTAINING HYDROLYZED ETHYL SILICATE, SAID HYDROLYZED ETHYL SILICATE CONTAINING AN AMOUNT OF SILICA WITHIN THE RANGE OF APPROXIMATELY 4 TO 15 PERCENT BY WEIGHT OF TOTAL NONAQUEOUS BINDER, AT LEAST PARTIALLY DRYING SAID COATING AND REPEATING SAID APPLYING AND DRYING STEPS UNTIL A MULTILAYERED SHELL IF FORMED ABOUT SAID PATTERN, AND THEREAFTER CONTACTING SAID SHELL WITH WATER TO HYDRATE THE PLASTER OF PARIS CONTENT OF THE MULTIPLE COATINGS THEREOF.
Claim 3
Dependent Claim
115 words
A MULTIPLE-LAYERED INVESTMENT CASTING SHELL HAVING INNER AND OUTER LAYERS CONSISTING ESSENTIALLY OF A MIXTURE OF SILICA AND A FINELY-DIVIDED REFRACTORY MATERIAL, AND A PLURALITY OF INTERMEDIATE LAYERS COMPOSED PREDOMINATELY OF HYDRATED PLASTER OF PARIS ADMIXED WITH A FINELY-DIVIDED REFRACTORY MATERIAL AND A MONOR PROPORTION OF A SILICA BINDER, SAID PLASTER OF PARIS, REFRACTORY MATERIAL, AND SILICA BINDER OF EACH LAYER COMPRISING THE RESIDUE OF A DIPCOAT CONTAINING AN AMOUNT OF SILICA WITHIN THE RANGE OF APPROXIMATLY 5 TO 15 PERCENT OF THE WEIGHT OF THE VOLATILE LIQUID PORTION OF SAID DIPCOAT, WHEREBY, UPON FIRING, AN INVESTMENT CASTING SHELL F FORMED HAVING RELATIVELY HARD CERAMIC INNER AND OUTER LAYERS AND A RELATIVELY WEAK PLASTER-CONTAINING CORE.
Claim 4
Dependent Claim
115 words
A MULTIPLE-LAYERED INVESTMENT CASTING SHELL HAVING INNER AND OUTER LAYERS CONSISTING ESSENTIALLY OF A MIXTURE OF SILICA AND A FINELY-DIVIDED REFRACTORY MATERIAL, AND A PLURALITY OF INTERMEDIATE LAYERS COMPOSED PREDOMINATELY OF HYDRATED PLASTER OF PARIS ADMIXED WITH A FINELY-DIVIDED REFRACTORY MATERIAL AND A MONOR PROPORTION OF A SILICA BINDER, SAID PLASTER OF PARIS, REFRACTORY MATERIAL, AND SILICA BINDER OF EACH LAYER COMPRISING THE RESIDUE OF A DIPCOAT CONTAINING AN AMOUNT OF SILICA WITHIN THE RANGE OF APPROXIMATLY 5 TO 15 PERCENT OF THE WEIGHT OF THE VOLATILE LIQUID PORTION OF SAID DIPCOAT, WHEREBY, UPON FIRING, AN INVESTMENT CASTING SHELL F FORMED HAVING RELATIVELY HARD CERAMIC INNER AND OUTER LAYERS AND A RELATIVELY WEAK PLASTER-CONTAINING CORE.
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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |