US3615774A
Expired / Lapsed
US
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Phosphate-bonded monolithic refractory batch
Assignee: Dresser Industries Inc
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Filing: 1968-01-08
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Granted: 1971-10-26
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Expires: 1988-01-08
Abstract
Abstract A refractory monolithic refractory batch comprising refractory aggregates reactive with phosphoric acid and phosphoric acid absorbed in exfoliated vermiculite.
Inventors
- 👤 George H Criss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/628; C04B35/63; C04B35/6303; C04B35/6306; C04B35/66
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
34 words
The batch according to claim 1 in which the refractory aggregate is selected from the group consisting of calcined clays, calcined bauxite, calcined diaspores, kyanite, mullite, zircon, Bayer process alumina, chromite, forsterite, and zirconia.
Claim 2
Dependent Claim
34 words
The batch according to claim 1 in which a portion of the refractory aggregate is highly reactive with phosphoric acid and selected from the group consisting of finely divided gibbsite, hydrated alumina, and magnesia.
Claim 3
Dependent Claim
13 words
The batch according to claim 1 in which the batch contains a plasticizer.
Claim 4
Dependent Claim
28 words
The batch according to claim 4 in which the plasticizer is selected from the group crude clays and crude bauxite, and high alumina materials, beneficiated clays and bentonites.
Claim 5
Dependent Claim
22 words
The batch according to claim 1 in which the vermiculite is present from 1 to 5 percent, by weight, of the batch.
Claim 6
Dependent Claim
29 words
The batch according to claim 1 in which the phosphoric acid is present in sufficient amount and concentrated to provide between 2 and 10 percent P2O5 in the batch.
Claim 7
Dependent Claim
26 words
The batch according to claim 1 in which the vermiculite is sized 90 percent plus 100 mesh and no more than 10 percent plus 8 mesh.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |