US2933153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil burner air cleaner
Assignee: Individual
•
Filing: 1958-10-10
•
Granted: 1960-04-19
•
Expires: 1978-10-10
Abstract
No abstract record available.
Inventors
- 👤 Benjamin F Kauffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:57
CPC Classifications
F; F23; F23C; F23C99/00; B; B01; B01D; B01D46/00; B01D46/10; F23C2700/00; F23C2700/02; F23C2700/023; Y; Y10; Y10S; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |