US2990247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum compounds
Assignee: Mallinckrodt Chemical Works
•
Filing: 1958-01-27
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Granted: 1961-06-27
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Expires: 1978-01-27
Abstract
No abstract record available.
Inventors
- 👤 Charles R Conard
- 👤 John F Lemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:33
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/36; C01B33/38; C01B33/40; C01B33/42; C01B33/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
THE METHOD OF MAKING A PRECIPITATED MAGNESIUM ALUMINUM SILICATE OF ABOUT THE FOLLOWING EMPIRICAL FORMULA: 2MGO.AL2O3.3SIO2.ZH2O
Claim 2
Independent Claim
16 words
THE METHOD OF MAKING A PRECIPITATED MAGNESIUM ALUMINUM SILICATE OF ABOUT THE FOLLOWING EMPIRICAL FORMULA: 2MGO.AL2O3.3SIO2.ZH2O
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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |