US2194980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burner apparatus for manufacturing carbon and lamp black
Assignee: Individual
•
Filing: 1938-04-23
•
Granted: 1940-03-26
•
Expires: 1958-04-23
Abstract
No abstract record available.
Inventors
- 👤 William A Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:47
CPC Classifications
F; F23; F23C; F23C99/00; C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/52; F23C2700/00; F23C2700/02; F23C2700/023
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) | 1943-03-26 | 1943-09-25 | 1944-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-03-26 | 1947-09-25 | 1948-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-03-26 | 1951-09-25 | 1952-03-26 | $7700.00 | Window Closed / Lapsed |