US3884709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous mullite refractory
Assignee: Saint Gobain Abrasives Inc
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Filing: 1973-12-17
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Granted: 1975-05-20
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Expires: 1993-12-17
Abstract
Abstract Porous refractory plates, tubes, or other shapes are produced by bonding fused coarse mullite particles with manganese oxide, by mixing the particles with a manganese salt, molding to shape, and firing at 1,425* to 1,475*C.
Inventors
- 👤 John Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:55
CPC Classifications
C; C04; C04B; C04B38/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
45 words
A METHOD OF MAKING POROUS MONOLITHIC SHAPES OF BONDED MULLITE GRITS COMPRISING FORMING AMIX MULLITE GRITS AND A MANGANESE COMPOUND HAVING A MELTING POINT BELOW 1,450*, AND WICH DECOMPOSES TO MANHANESE OXIDE BETWEEN ITE MELTING POINT AND 1,450*, FORMING SAID MIX TO SHAPE A S
Claim 2
Independent Claim
45 words
A METHOD OF MAKING POROUS MONOLITHIC SHAPES OF BONDED MULLITE GRITS COMPRISING FORMING AMIX MULLITE GRITS AND A MANGANESE COMPOUND HAVING A MELTING POINT BELOW 1,450*, AND WICH DECOMPOSES TO MANHANESE OXIDE BETWEEN ITE MELTING POINT AND 1,450*, FORMING SAID MIX TO SHAPE A S
Claim 3
Dependent Claim
14 words
A method as in claim 1 in which the manganese salt is manganese chloride.
Claim 4
Dependent Claim
24 words
A porous monolithic mullite body consisting of mullite grains bonded at their points of contact with a reaction product of manganese oxide and mullite.
Claim 5
Dependent Claim
24 words
A porous monolithic mullite body consisting of mullite grains bonded at their points of contact with a reaction product of manganese oxide and mullite.
Claim 6
Dependent Claim
20 words
A mullite body as in claim 3 containing from 0.2 to 0.05 gram atoms of manganese per mole of mullite.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |