Patent US4491575A successfully refreshed from Google Patents.
US2417606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for the production of carbon black
Assignee: Individual
•
Filing: 1943-06-03
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Granted: 1947-03-18
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Expires: 1963-06-03
Abstract
No abstract record available.
Inventors
- 👤 Percival H Mitchell
- 👤 Malcolm Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:34
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190526578A
Cited
US1490469A
Cited
US2121463A
Cited
US1773002A
Cited
US1892862A
Cited
US2144971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-17 | 1950-09-16 | 1951-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-17 | 1954-09-16 | 1955-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-17 | 1958-09-16 | 1959-03-18 | $7700.00 | Window Closed / Lapsed |