Patent US2526397A successfully refreshed from Google Patents.
US3673293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of plaster of paris mold having sprayed metal oxide linings and product
Assignee: Norton Abrasives Ltd
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Filing: 1970-02-17
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Granted: 1972-06-27
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Expires: 1990-02-17
Abstract
Abstract A metal or ceramic form of desired shape and conditioned to permit its later removal from a flame sprayed layer is flame sprayed to form a metal oxide layer of desired thickness having a porosity of 10 percent or more. A plaster of paris slurry is then poured around this layer and allowed to set up at which time the form is removed leaving a plaster of parismold with a flame sprayed metal oxide wear resistant working lining suitable for use in slip casting, etc.
Inventors
- 👤 Ernest Douglas Teague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:37
CPC Classifications
B; B28; B28B; B28B19/00; B28B7/00; B28B7/34; B28B7/346; C; C03; C03B; C03B19/00; C03B19/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
A method as in claim 1 wherein the metal oxide is an alumina material and is sprayed to have a porosity of about 10 percent.
Claim 2
Dependent Claim
18 words
A method as in claim 1 wherein the hardned plaster of Paris mold is shaped subsequent to setting.
Claim 3
Dependent Claim
25 words
A method as in claim 1 wherein the metal oxide layer is sprayed to be approximately in the range of 0.002 to 0.005 inches thick.
Claim 4
Dependent Claim
184 words
A composite slip cast mold structure having a smooth porous surface in the mold to receive the slip and a porous body to absorb the water from the slip comprising a flame sprayed porous refractory metal oxide layer that is initially formed to shape by being sprayed as molten droplets and frozen in situ on a metal or ceramic form conditioned to permit the form to be later separated from the flame sprayed material and having the shape of the slip casting to be produced and a mass of plaster of Paris material integrally bonded to said solidified layer; said metal oxide layer having a smooth exposed slip receiving surface and a rougher interface surface that is bonded to said plaster of Paris material; said smooth surface having approximately the same degree of finish as the surface of the mold onto which the molten metal oxide was sprayed; said rougher interface surface being the exposed surface of the layer resulting from flame spraying and freezing the metal oxide in situ on a mold; and said metal oxide layer being hard, wear resistant and porous.
Claim 5
Dependent Claim
14 words
A mold structure as in claim 5 wherein the slip receiving layer is alumina.
Claim 6
Dependent Claim
19 words
a mold structure as in claim 5 wherein the slip receiving layer is approximately 0.002 to 0.005 inches thick.
Claim 7
Dependent Claim
19 words
A mold structure as in claim 6 wherein the alumina layer is about 10 percent open and interconnected pores.
Claim 8
Dependent Claim
17 words
A mold structure as in claim 8 wherein the porous alumina layer is approximately 0.004 inches thick.
References Cited (Backward Citations)
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Cited
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US2990601A
Cited
FR1243882A
Cited
US3228650A
Cited
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Cited
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |