US2201520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fume digester
Assignee: Individual
•
Filing: 1939-04-19
•
Granted: 1940-05-21
•
Expires: 1959-04-19
Abstract
No abstract record available.
Inventors
- 👤 William S Callahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:11
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0027; B01D46/0038; B01D46/66; B01D46/74; B01D46/76; B01D46/02; B01D46/04; B01D46/70; B01D46/71; B01D53/00; B01D53/34
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) | 1943-05-21 | 1943-11-20 | 1944-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-21 | 1947-11-20 | 1948-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-21 | 1951-11-20 | 1952-05-21 | $7700.00 | Window Closed / Lapsed |