US2487689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace dust and smoke collector
Assignee: Individual
•
Filing: 1946-04-29
•
Granted: 1949-11-08
•
Expires: 1966-04-29
Abstract
No abstract record available.
Inventors
- 👤 Charles R H Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:11
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/191; F24B1/1915; F23; F23J; F23J1/00; F23J1/02; Y; Y10; Y10S; Y10S454/00; Y10S454/903
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) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |