Patent US318864A successfully refreshed from Google Patents.
Patent US3878034A successfully refreshed from Google Patents.
US3878034A
Expired / Lapsed
US
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Refractory laminate based on negative sol or silicate and positive sol
Assignee: EIDP Inc
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Filing: 1973-03-07
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Granted: 1975-04-15
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Expires: 1993-03-07
Abstract
Abstract Refractory laminates and refractory laminate articles are provided which comprise alternate layers of (1) a gel of negatively charged colloidal particles of an inorganic substance or an alkaline ionic silicate and (2) a gel of positively charged colloidal particles of an inorganic substance.
Inventors
- 👤 James N Bever
- 👤 Jr Earl P Moore
- 👤 Robert L Rusher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:00
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B22; B22C; B22C1/00; B22C1/16; B22C1/165; B22C9/00; B22C9/02; B22C9/04; C04B20/00; C04B20/10; C04B20/1055; C04B20/1066; C04B28/00; C04B28/24; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316; C04B35/66; C04B41/45; C04B41/52; C04B41/528; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/00939; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/34; C04B2235/3418; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
53 words
A REFRACTORY LAMINATE COMPRISING ALTERNATE LAYERS OF (1) A GEL OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF NEGATIVELY CHARGED COLLODIAL SILICA PARTICLES AND A QUATERNARY AMMONIUM, SODIUM, POTASSIUM OR LITHIUM SILICATE AND (2) A GEL OF POSITIVELY CHARGED COLLOIDAL PARTICLES SELECTED FROM THE GROUP CONSISTING OF SILICA AND ALUMINA PARTICLES.
Claim 2
Dependent Claim
53 words
A REFRACTORY LAMINATE COMPRISING ALTERNATE LAYERS OF (1) A GEL OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF NEGATIVELY CHARGED COLLODIAL SILICA PARTICLES AND A QUATERNARY AMMONIUM, SODIUM, POTASSIUM OR LITHIUM SILICATE AND (2) A GEL OF POSITIVELY CHARGED COLLOIDAL PARTICLES SELECTED FROM THE GROUP CONSISTING OF SILICA AND ALUMINA PARTICLES.
Claim 3
Dependent Claim
24 words
A refractory laminate of claim 1 wherein the positively charged colloidal particles are composed of a silica core coated with a polyvalent metal-oxygen compound.
Claim 4
Dependent Claim
17 words
A refractory laminate of claim 2 wherein the positively charged colloidal particles are alumina-coated colloidal silica particles.
Claim 5
Dependent Claim
14 words
A refractory laminate of claim 3 wherein the gel layers contain particulate refractory material.
Claim 6
Dependent Claim
19 words
A refractory laminate of claim 3 wherein the gel layers are separated by intermediate layers of particulate refractory material.
Claim 7
Dependent Claim
19 words
A refractory laminate of claim 4 wherein the gel layers are separated by intermediate layers of particulate refractory material.
Claim 8
Dependent Claim
13 words
The refractory laminate of claim 1 in the form of a shell mold.
Claim 9
Dependent Claim
13 words
The refractory laminate of claim 2 in the form of a shell mold.
Claim 10
Dependent Claim
13 words
The refractory laminate of claim 3 in the form of a shell mold.
Claim 11
Dependent Claim
13 words
The refractory laminate of claim 4 in the form of a shell mold.
Claim 12
Dependent Claim
13 words
The refractory laminate of claim 6 in the form of a shell mold.
Claim 13
Dependent Claim
25 words
A refractory shell mold of claim 11 wherein the refractory grain in the innermost two gel layers is finer than that in remaining gel layers.
References Cited (Backward Citations)
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |