Patent US4425411A successfully refreshed from Google Patents.
US4425411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold with thermally insulating, protective coating
Assignee: LAUENER ENGINEERING AG
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Filing: 1982-05-10
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Granted: 1984-01-10
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Expires: 2002-05-10
Abstract
Abstract The mold features on its work face a thermally insulating protective layer of sub-micron metal oxide particles. The coating can be applied by spraying an aqueous sol of a metal oxide onto the mold work face which has been heated to at least 60° C. The use of sub-micron sized metal oxide particles enables the formation of a protective coating of very low density and consequently very low thermal conductivity. The coating can furthermore be deposited very economically, and likewise removed again.
Inventors
- 👤 Marcus Textor
- 👤 Tibor Kugler
- 👤 Jean-Pierre Gabathuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:56
CPC Classifications
B; B22; B22C; B22C23/00; B22C23/02; B22C3/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
41 words
A mold for casting metal wherein said mold has a work face and a thermally insulating protective coating on said work face, wherein said protective coating consists essentially of sub-micron ceramin metal oxide particles having a particle size of 5-50 nm.
Claim 2
Dependent Claim
41 words
A mold for casting metal wherein said mold has a work face and a thermally insulating protective coating on said work face, wherein said protective coating consists essentially of sub-micron ceramin metal oxide particles having a particle size of 5-50 nm.
Claim 3
Dependent Claim
25 words
Mold according to claim 1 wherein the protective coating of metal oxide particles has a mass of 0.002-2 mg/cm 2 of the mold work face.
Claim 4
Dependent Claim
18 words
Mold according to claim 2 wherein said protective coating has a density of about 0.2 g/cm 3 .
Claim 5
Dependent Claim
17 words
Mold according to claim 3 wherein said protective coating has a thickness from 0.0001 to 0.1 mm.
Claim 6
Dependent Claim
30 words
Mold according to claim 1 wherein said particles are selected from the group consisting of SiO 2 , Al 2 O 3 , MgO, TiO 2 and ZrO 2 .
Claim 7
Dependent Claim
18 words
Mold according to claim 5 wherein the protective coating is made up essentially of sub-micron SiO 2 particles.
Claim 8
Dependent Claim
16 words
Mold according to claim 1 wherein a plurality of layers of said protective coating are provided.
Claim 9
Dependent Claim
20 words
Mold according to claim 1 wherein the protective coating is made up essentially of sub-micron Al 2 O 3 particles.
Claim 10
Dependent Claim
55 words
Process for coating the work face of a mold with a thermally insulating protective coating which comprises: providing a mold having a work face, wetting the said work face with an aqueous sol containing essentially sub-micron ceramin metal oxide particles having a particle size of 5-50 nm, and subsequently substantially evaporating away the water phase.
Claim 11
Dependent Claim
55 words
Process for coating the work face of a mold with a thermally insulating protective coating which comprises: providing a mold having a work face, wetting the said work face with an aqueous sol containing essentially sub-micron ceramin metal oxide particles having a particle size of 5-50 nm, and subsequently substantially evaporating away the water phase.
Claim 12
Dependent Claim
26 words
Process according to claim 9 wherein the mold work face is heated to a temperature of at least 60° C. and sprayed with the aqueous sol.
Claim 13
Dependent Claim
28 words
Process according to claim 9 wherein the work face of the mold is heated to a temperature of at least 60° C. and immersed in the aqueous sol.
Claim 14
Dependent Claim
30 words
Process according to claim 9 wherein said particles are selected from the group consisting of SiO 2 , Al 2 O 3 , MgO, TiO 2 and ZrO 2 .
Claim 15
Dependent Claim
18 words
Process according to claim 12 wherein the protective coating is made up essentially of sub-micron SiO 2 particles.
Claim 16
Dependent Claim
25 words
Process according to claim 9 wherein the protective coating of metal oxide particles has a mass of 0.002-2 mg/cm 2 of the mold work face.
Claim 17
Dependent Claim
25 words
Process according to claim 14 including the step of coating said mold with a protective coating having a density of about 0.2 g/cm 3 .
Claim 18
Dependent Claim
24 words
Process according to claim 15 including the step of coating said mold with a protective coating having a thickness from 0.0001 to 0.1 mm.
Claim 19
Dependent Claim
21 words
Process according to claim 9 including the step of coating said mold with a plurality of layers of said protective coating.
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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |