Patent US3226252A successfully refreshed from Google Patents.
US3226252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color-reactable inorganic adsorbent pigment and sensitized sheet material coated therewith
Assignee: BASF Catalysts LLC
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Filing: 1962-01-17
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Granted: 1965-12-28
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Expires: 1982-01-17
Abstract
No abstract record available.
Inventors
- 👤 Glen A Hemstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:13
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/1555; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/259
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
PAPER HAVING A SENSITIZED COLOR-REACTABLE SURFACE COATING COMPRISING PIGMENT PARTICLES, THE MAJOR JPORTION OF WHICH ARE WHITE PARTICLES OF AN AMORPHOUS ALUMINUM SILICATE OF THE APPROXIMATE FORMULA AL2O3$2SIO2, SAID SILICATE HAVING A B.E.T. SURFACE AREA WITHIN THE RANGE OF ABOUT 50 TO ABOUT 100 SQ. M./GM. AND HAVING BEEN OBTAINED BY HYDROTHERMALLY REHYDRATING METAKAOLIN AT SUPERATMOSPHERIC PRESSURE TO OBTAIN AN AMORPHOUS ALUMINUM SILICATE OF THE APPROXIMATE FORMULA AL2O3$2SIO2(1.4-1.7) H2O AND HAVING A B.E.T. SURFACE AREA OF AT LEAST ABOUT 120 SQ. M./GM., AND CALCINING SAID REHYDRATED METAKAOLIN AT A TEMPERATURE WITHIN THE RANGE OF 900*C. TO 1100*C. FOR A TIME SUFFICIENT TO REMOVE SUBSTANTIALLY ALL OF THE WATER OF HYDRATION THEREFROM.
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |