US3445259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coprecipitated cahpo4-2h2o and caso4-2h2/ pigment and method of preparation
Assignee: WR Grace and Co
•
Filing: 1968-05-03
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Granted: 1969-05-20
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Expires: 1988-05-03
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:46
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; B; B82; B82Y; B82Y30/00; C; C09; C09C; C09C1/00; C09C1/0081; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2263656A
Cited
US2266233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |