US1913340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activating carbon
Assignee: DARCO Corp
•
Filing: 1931-02-03
•
Granted: 1933-06-06
•
Expires: 1951-02-03
Abstract
No abstract record available.
Inventors
- 👤 Marshall T Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:29
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/336; Y; Y10; Y10S; Y10S48/00; Y10S48/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-06-05 | 1936-12-05 | 1937-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-05 | 1940-12-05 | 1941-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-05 | 1944-12-05 | 1945-06-06 | $7700.00 | Window Closed / Lapsed |