Patent US3561987A successfully refreshed from Google Patents.
US3561987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chrome base plastic refractory
Assignee: Combustion Engineering Inc
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Filing: 1968-06-13
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Granted: 1971-02-09
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Expires: 1988-06-13
Abstract
Abstract A CHROME BASE PLASTIC REFRACTORY MATERIAL EMPLOYING AN ACID PHOSPHATE BINDER, SUCH AS ALUMINUM PHOSPHATE OR PHOSPHORIC ACID, AND A COATING ON THE CHROME ORE PARTICLES TO PREVENT REACTION BETWEEN THE BASIC CONSTITUENTS OF THE ORE AND THE ACID BINDER DURING STORAGE. THE COATING SOLUTION CONTAINS SODIUM ZINC HEXAMETAPHOSPHATE, CUPRIC ACETATE AND SODIUM NITRITE.
Inventors
- 👤 Louis J Jacobs
- 👤 Robert E Fisher
- 👤 Carl J Cherry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:07
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/131; C04B35/00; C04B35/01; C04B35/12; C04B35/42; C04B35/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |