US2440424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of carbon black
Assignee: Columbian Carbon Co
•
Filing: 1944-05-04
•
Granted: 1948-04-27
•
Expires: 1964-05-04
Abstract
No abstract record available.
Inventors
- 👤 William B Wiegand
- 👤 Harold A Braendle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:21
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)
GB191024256A
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US1364273A
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US1804249A
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US1925130A
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US2163630A
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US2153951A
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US2375795A
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US2375797A
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US2378055A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-27 | 1951-10-27 | 1952-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-27 | 1955-10-27 | 1956-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-27 | 1959-10-27 | 1960-04-27 | $7700.00 | Window Closed / Lapsed |