US3798045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica encapsulated lead chromate pigment of the primrose yellow shade
Assignee: HEUBACH Inc A DE CORP
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Filing: 1972-09-27
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Granted: 1974-03-19
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Expires: 1992-09-27
Abstract
Abstract A primrose yellow shade pigment of outstanding light stability is prepared. The pigment comprises orthorhombic phase particles of a chemically prereduced lead chromate-lead sulfate solid solution, which particles are encapsulated with a dense amorphous silica coating.
Inventors
- 👤 J Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:58
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/14; C09C1/20; C01; C01P; C01P2002/00; C01P2002/50; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/32; C01P2006/37; C01P2006/60
Claims Analysis
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |