US3661608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for use in refractories
Assignee: Calgon Corp
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Filing: 1969-08-18
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Granted: 1972-05-09
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Expires: 1989-08-18
Abstract
Abstract Compositions comprising B2O3, P2O5, H2O and, typically, alkali metal oxides are disclosed. These compositions are useful as binders for refractory compositions.
Inventors
- 👤 Paul H Ralston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:09
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315
Claims Analysis
Total Claims: 0
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |