US2817595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of chalk resistant anatase pigment
Assignee: NL Industries Inc
•
Filing: 1954-02-04
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Granted: 1957-12-24
•
Expires: 1974-02-04
Abstract
No abstract record available.
Inventors
- 👤 Anthony T Kalinowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C09C3/00; C09C3/04; C09C3/043; C09C3/06; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR PRODUCING A CHLAK RESISTANT TIO2 PIGMENT MATERIAL OF THE ANATASE CYSTALLINE STRUCTURE HAVING IMPROVED BRIGHTNESS AND COLOR WHICH COMPRISES CALCINING A TIO2 HYDRATE AT A TEMPERATURE FROM 900*C. TO 1100*C. IN THE PRESENCE OF POTASSIUM, PHOSPHORUS AND BARIUM WHEREIN THE BARUIN AN PHOSPHOROUS VALUES, ADDED AS BARUIM CARBONATE AND PHOSPHORIC ACID RESPECTIVELY, ARE PRESENT AS OXIDES IN RELATIVELY SMALL AMOUNTS RANGING FROM ABOUT 0.2 TO ABOUT 0.5% CALCULFATED AS OXIDES ON A TIO2 WEIGHT BASIS WHILE THE COMPOUND OF POTASSOUM, ADDED AS ABOUT 0.6 TO ABOUT 1% ON A TIO2 WEIGHT BASIS.
Claim 2
Dependent Claim
95 words
A PROCESS FOR PRODUCING A CHLAK RESISTANT TIO2 PIGMENT MATERIAL OF THE ANATASE CYSTALLINE STRUCTURE HAVING IMPROVED BRIGHTNESS AND COLOR WHICH COMPRISES CALCINING A TIO2 HYDRATE AT A TEMPERATURE FROM 900*C. TO 1100*C. IN THE PRESENCE OF POTASSIUM, PHOSPHORUS AND BARIUM WHEREIN THE BARUIN AN PHOSPHOROUS VALUES, ADDED AS BARUIM CARBONATE AND PHOSPHORIC ACID RESPECTIVELY, ARE PRESENT AS OXIDES IN RELATIVELY SMALL AMOUNTS RANGING FROM ABOUT 0.2 TO ABOUT 0.5% CALCULFATED AS OXIDES ON A TIO2 WEIGHT BASIS WHILE THE COMPOUND OF POTASSOUM, ADDED AS ABOUT 0.6 TO ABOUT 1% ON A TIO2 WEIGHT BASIS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |