US3827901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium-aluminum-silicate extender pigment
Assignee: NL Chemicals Inc
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Filing: 1972-07-24
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Granted: 1974-08-06
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Expires: 1992-07-24
Abstract
Abstract THIS INVENTION RELATES TO A NEW COMPOSITION OF MATTER WHICH IS USEFUL AS A PIGMENT COMPOSITION FOR THE PAPER INDUSTRY. THE COMPOSITION IS WATER INSOLUBLE AND COMPRISES AN INTIMATE MIXTURE OF TITANIUM DIOXIDE AND A CALCIUM-ALUMINUM-SILICATE COMPOSITION IN WHICH THE AMOUNT OF TITANIUM DIOXIDE EMPLOYED IS FROM 0.6 TO 4 PARTS FOR EACH PART OF THE CALCIUM-ALUMINUM-SILICATE COMPOSITION. THE CALCIUM-ALUMINUM-SILICATE COMPOSITION IS WATER INSOLUBLE AND CONTAINS THE CONSTITUENTS IN THE AMOUNTS INDICATED (ALL AMOUNTS ARE EXPRESSED BY WEIGHT): CONSTITUENTS: PARTS BY WEIGHT CAO 1 AL2O3 0.8-1.2 SIO2 12-16 H2O 2-4
Inventors
- 👤 T Griffin
- 👤 K Heywood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:52
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/68
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |