Patent US2453440A successfully refreshed from Google Patents.
US2453440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon black
Assignee: Shawinigan Chemicals Ltd
•
Filing: 1944-04-12
•
Granted: 1948-11-09
•
Expires: 1964-04-12
Abstract
No abstract record available.
Inventors
- 👤 Kaufmann Charles
- 👤 Ronald H Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:09
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)
US1613323A
Cited
US986489A
Cited
US901232A
Cited
GB191024256A
Cited
US1192597A
Cited
US1288400A
Cited
US1444601A
Cited
US2121463A
Cited
US1782540A
Cited
US1614854A
Cited
US1838316A
Cited
US1881325A
Cited
US1999541A
Cited
US1920352A
Cited
US2134950A
Cited
US2255059A
Cited
US2163630A
Cited
US2126838A
Cited
US2232727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |