Patent FR1534967A successfully refreshed from Google Patents.
US3169288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coatings for patterns employed in cavityless casting process
Assignee: Dow Chemical Co
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Filing: 1961-12-15
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Granted: 1965-02-16
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Expires: 1981-12-15
Abstract
No abstract record available.
Inventors
- 👤 John L Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:03
CPC Classifications
B; B22; B22C; B22C3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN A PROCESS FOR CASTING OF METALS WHICH COMPRISES MAKING A PATTERN MOLD WITH DESTRUCTIBLE PATTERNS OF FOAMED, THERMOPLASTIC RESINOUS MATERIALS WITH SURFACES CORRESPONDING TO THE DESIRED CASTING EMBEDDED IN SAID MOLD, AND THE POURING OF MOLTEN METAL INTO SAID MOLD WHEREBY THE FOAM PATTERN IS DESTROYED AND A METAL CASTING IS OBTAINED, THE IMPROVEMENT WHICH COMPRISES DEPOSITING ON THE SURFACE OF THE PATTERN A COATING OF AN AQUEOUS SUSPENSION OF AN ADMISTURE OF AT LEAST ONE PULVERULENT INORGANIC REFRACTORY MATERIAL AND A BINDING AGENT THEREFOR AND CAUSING THE REMOVAL OF WATER FROM THE DEPOSITED WET COATING WHEREBY TO PROVIDE THE PATTERN WITH A SMOOTH, DRY, ADHERENT, CEMENTITIOUS COATING.
Claim 2
Dependent Claim
109 words
IN A PROCESS FOR CASTING OF METALS WHICH COMPRISES MAKING A PATTERN MOLD WITH DESTRUCTIBLE PATTERNS OF FOAMED, THERMOPLASTIC RESINOUS MATERIALS WITH SURFACES CORRESPONDING TO THE DESIRED CASTING EMBEDDED IN SAID MOLD, AND THE POURING OF MOLTEN METAL INTO SAID MOLD WHEREBY THE FOAM PATTERN IS DESTROYED AND A METAL CASTING IS OBTAINED, THE IMPROVEMENT WHICH COMPRISES DEPOSITING ON THE SURFACE OF THE PATTERN A COATING OF AN AQUEOUS SUSPENSION OF AN ADMISTURE OF AT LEAST ONE PULVERULENT INORGANIC REFRACTORY MATERIAL AND A BINDING AGENT THEREFOR AND CAUSING THE REMOVAL OF WATER FROM THE DEPOSITED WET COATING WHEREBY TO PROVIDE THE PATTERN WITH A SMOOTH, DRY, ADHERENT, CEMENTITIOUS COATING.
References Cited (Backward Citations)
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Cited
US2623809A
Cited
US2836867A
Cited
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Cited
US2830343A
Cited
US3070991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |