US3579310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acicular rutile tio2
Assignee: EIDP Inc
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Filing: 1967-06-28
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Granted: 1971-05-18
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Expires: 1987-06-28
Abstract
Abstract PIGMENTARY SINGLE ACICULAR RUTILE TIO2 CRYSTALS, AT LEAST 50% BY WEIGHT OF THE PARTICULES OF WHICH HAVE AN AVERAGE CROSS-SECTIONAL DIMENSION OF 0.01 TO 0.5 MICRON AND A LENGTH-TO-CROSS SECTIONAL RATIO OF 3:1 TO 50;1, OBTAINED BY CALCINING A 725-1000*C. A BLENDED TITANIA-SALT-PROMOTER MIXTURE MADE UP OF PREFORMED TIO2, A SALT COMPRISING SODIUM CHLORIDE, AND AN OXY-COMPOUND OF PHOSPHORUS (PHOSPHATE), AND LEACHING OF THE CALCINED PRODUCT TO RECOVER THE ACICULAR RUTILE PIGMENT.
Inventors
- 👤 George L Lewis
- 👤 Carl H Muendel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:45
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C01; C01P; C01P2004/00; C01P2004/10; C01P2004/54; C01P2004/60; C01P2004/62; C01P2004/64; Y; Y10; Y10S; Y10S117/00; Y10S117/906
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |