US3878034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory laminate based on negative sol or silicate and positive sol
Assignee: EIDP Inc
•
Filing: 1973-03-07
•
Granted: 1975-04-15
•
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 04:51
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)
US2380945A
Cited
US2892797A
Cited
US3007878A
Cited
US3165799A
Cited
US3270382A
Cited
US3292220A
Cited
US3396775A
Cited
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 |