Patent US2020539A successfully refreshed from Google Patents.
US2020539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing ultramarine blue and a new article of manufacture
Assignee: Standard Ultramarine and Color Co
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Filing: 1931-05-07
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Granted: 1935-11-12
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Expires: 1951-05-07
Abstract
No abstract record available.
Inventors
- 👤 Dourif Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:11
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/32; C01; C01P; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/10; C01P2006/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-11-11 | 1939-05-13 | 1939-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-11 | 1943-05-13 | 1943-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-11 | 1947-05-13 | 1947-11-12 | $7700.00 | Window Closed / Lapsed |