Patent US2586243A successfully refreshed from Google Patents.
US2586243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: Individual
•
Filing: 1950-02-21
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Granted: 1952-02-19
•
Expires: 1970-02-21
Abstract
No abstract record available.
Inventors
- 👤 George F Mcdougall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:01
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1430066A
Cited
US1820530A
Cited
US1523916A
Cited
US1464741A
Cited
US1534831A
Cited
US1756909A
Cited
US2046093A
Cited
US2106589A
Cited
US2417130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |