US3448052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic carbon blacks
Assignee: Ashland LLC
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Filing: 1965-04-15
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Granted: 1969-06-03
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Expires: 1985-04-15
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang K F Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:46
CPC Classifications
B; B82; B82Y; B82Y25/00; C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; H; H01; H01F; H01F1/00; H01F1/0036; H01F1/0045; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; C01; C01P; C01P2006/00; C01P2006/42
Claims Analysis
Total Claims: 0
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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) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |