US2492481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making carbon black
Assignee: Shawinigan Chemicals Ltd
•
Filing: 1948-10-11
•
Granted: 1949-12-27
•
Expires: 1968-10-11
Abstract
No abstract record available.
Inventors
- 👤 Kaufmann Charles
- 👤 Hall Ronald Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:59
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/54
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US986489A
Cited
US1106304A
Cited
US1278180A
Cited
US1451367A
Cited
US2121463A
Cited
US2126838A
Cited
US2232727A
Cited
US2453440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |