US2459907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of conducting chemical reactions
Assignee: National Carbon Co Inc
•
Filing: 1942-09-04
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Granted: 1949-01-25
•
Expires: 1962-09-04
Abstract
No abstract record available.
Inventors
- 👤 Nathaniel M Winslow
- 👤 George W Heise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36; B; B01; B01J; B01J27/00; B01J27/20; B01J27/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1157293A
Cited
US1530392A
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US1481957A
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US1842197A
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DE526001C
Cited
US1845280A
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US1961164A
Cited
US1960951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-25 | 1952-07-26 | 1953-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-25 | 1956-07-26 | 1957-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-25 | 1960-07-26 | 1961-01-25 | $7700.00 | Window Closed / Lapsed |