Patent US2440720A successfully refreshed from Google Patents.
Patent US3863701A successfully refreshed from Google Patents.
US3863701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing heat-insulated castings
Assignee: Toyota Motor Corp
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Filing: 1972-05-17
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Granted: 1975-02-04
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Expires: 1992-05-17
Abstract
Abstract The present disclosure relates to a process for manufacturing cast pipes of the type which excel in heat-insulating characteristics and which are highly durable under high temperatures. An internal core of metallic material with high resistance to heat and corrosion is externally coated with a highly heat-insulating layer to thereby produce a double structure, and the double structure is then surrounded in molten metal to produce the casting.
Inventors
- 👤 Itaru Niimi
- 👤 Yasuhisa Kaneko
- 👤 Akiyoshi Morita
- 👤 Katumi Yagi
- 👤 Hiromitu Kashiwagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:58
CPC Classifications
B; B22; B22D; B22D19/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A PROCESS FOR MAUUFACTURING HEAT-INSULATED CASTINGS COMPRISING THE STEPS OF PROVIDING A HOLLOW METAL CORE HAVING RESISTANCE TO HEAT AND CORROSION, APPLYING A BONDING AGENT TO THE OUTSIDE OF THE CORE AND THEREAFTER COATING S FOAMED ALUMINA ONTO THE BONDING AGENT ON THE OUTSIDE OF THE METAL CORE, DRYING THE THUS OBTAINED DOUBLE STRUCTURE AT ROOM TEMERATURE, AND THEN AT A TEMPERATURE OF APPROXIMATELY 250*C. FOR AT LEAST ABOUT 10 HOURS FOLLOWED BY DRYING AT ABOUT 500*C. FOR SEVERAL HOURS, POSITIONING THE DOUBLE STRUCTURE IN A MOLD, AND POURING MOLTEN METAL INTO THE MOLD TO SURROUND THE DOUBLE STRUCTURE IN A METAL CASTING.
Claim 2
Dependent Claim
103 words
A PROCESS FOR MAUUFACTURING HEAT-INSULATED CASTINGS COMPRISING THE STEPS OF PROVIDING A HOLLOW METAL CORE HAVING RESISTANCE TO HEAT AND CORROSION, APPLYING A BONDING AGENT TO THE OUTSIDE OF THE CORE AND THEREAFTER COATING S FOAMED ALUMINA ONTO THE BONDING AGENT ON THE OUTSIDE OF THE METAL CORE, DRYING THE THUS OBTAINED DOUBLE STRUCTURE AT ROOM TEMERATURE, AND THEN AT A TEMPERATURE OF APPROXIMATELY 250*C. FOR AT LEAST ABOUT 10 HOURS FOLLOWED BY DRYING AT ABOUT 500*C. FOR SEVERAL HOURS, POSITIONING THE DOUBLE STRUCTURE IN A MOLD, AND POURING MOLTEN METAL INTO THE MOLD TO SURROUND THE DOUBLE STRUCTURE IN A METAL CASTING.
Claim 3
Dependent Claim
43 words
A process for manufacturing heat-insulated castings as in claim 1 wherein the double structure is positioned in a sand mold and the molten metal is poured vertically into the mold to thereby fill the cavity between the double structure and the sand mold.
Claim 4
Dependent Claim
119 words
A process for manufacturing heat-insulated castings comprising the steps of providing a hollow metal core having resistance to heat and corrosion, applying a bonding agent to the outside of the core and thereafter applying several times repeatedly a slurry consisting of sodium silicate and zircon flour as the bonding agent on the outside of the metal core on which a foamed polystyrene is spread, drying the thus obtained double structure at room temperature, and then at a temperature of approximately 250*C. for at least about 10 hours followed by drying at about 500*C. for several hours, positioning the double structure in a mold, and pouring molten metal into the mold to surround the double structure in a metal casting.
Claim 5
Dependent Claim
119 words
A process for manufacturing heat-insulated castings comprising the steps of providing a hollow metal core having resistance to heat and corrosion, applying a bonding agent to the outside of the core and thereafter applying several times repeatedly a slurry consisting of sodium silicate and zircon flour as the bonding agent on the outside of the metal core on which a foamed polystyrene is spread, drying the thus obtained double structure at room temperature, and then at a temperature of approximately 250*C. for at least about 10 hours followed by drying at about 500*C. for several hours, positioning the double structure in a mold, and pouring molten metal into the mold to surround the double structure in a metal casting.
Claim 6
Dependent Claim
43 words
A process for manufacturing heat-insulated castings as in claim 3 wherein the double structure is positioned in a sand mold and the molten metal is poured vertically into the mold to thereby fill the cavity between the double structure and the sand mold.
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |