US3862845A
Expired / Lapsed
US
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Alumina refractories having a permanent expansion upon heating
Assignee: CHAS TAYLOR'S SONS Co
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Filing: 1974-02-25
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Granted: 1975-01-28
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Expires: 1994-02-25
Abstract
Abstract A new alumina-chromic oxide refractory composition having a permanent expansion upon heating has been prepared. It has the following composition: % Alumina72-98 Chromic Oxide1-25 Magnesium Oxide0.1-0.5 P2O5 0.5-4.
Inventors
- 👤 Edward L Manigault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:43
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/101; C04B35/105; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6306; C04B35/6313
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
Method for preparation of refractory composition having a permanent expansion upon heating which comprises admixing from 72 percent to 98 percent alumina, from 1 percent to 25 percent chromic oxide and 4 percent to 7 percent of a magnesium phosphate solution containing from 3 percent to 7 percent MgO and from 35 percent to 55 percent phosphoric acid, forming said mixture into bricks and firing said bricks to produce said refractory composition.
Claim 2
Dependent Claim
14 words
Method according to claim 2 in which the alumina employed is 99+ percent alumina.
Claim 3
Dependent Claim
57 words
Method of forming a ceramic composition in an unformed state which comprises admixing from 72 percent to 98 percent alumina, from 1 percent to 25 percent chromic oxide and from 4 percent to 7 percent of a magnesium phosphate solution containing from 3 percent to 7 percent MgO and from 35 percent to 55 percent phosphoric acid.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |