US3727666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of casting using a mold having a refractory coating thereon
Assignee: Howmet Turbine Components Corp
•
Filing: 1971-08-16
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Granted: 1973-04-17
•
Expires: 1991-08-16
Abstract
Abstract A metal ingot mold having a thin bonded coating on the mold surface of a finely divided refractory material.
Inventors
- 👤 J Sluis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:33
CPC Classifications
B; B22; B22C; B22C3/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
27 words
The method as claimed in claim 1 in which the refractory coating is preheated immediately prior to metal pouring to a temperature of at least 400* F.
Claim 2
Dependent Claim
27 words
The method as claimed in claim 1 in which the refractory coating is preheated immediately prior to metal pouring to a temperature of at least 1,000* F.
Claim 3
Dependent Claim
38 words
The method as claimed in claim 1 in which the metal mold is coated with a coating composItion containing the finely divided refractory material in an amount within the range of 80-95% by weight on the solids basis.
Claim 4
Dependent Claim
33 words
The method as claimed in claim 1 in which the finely divided refractory material is selected from the group consisting of silica, zircon, alumina, titania, fused quartz, thoria, mullite, chromite and mixtures thereof.
Claim 5
Dependent Claim
14 words
The method as claimed in claim 1 in which the binder is colloidal silica.
Claim 6
Dependent Claim
29 words
The method as claimed in claim 1 in which the coating composition contains a hydrophilic emulsifying agent present in an amount within the range of 0.2-2 percent by weight.
Claim 7
Dependent Claim
17 words
The method as claimed in claim 7 in which the hydrophilic emulsifying agent is a natural gum.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |