US2855641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric air purifier
Assignee: Individual
•
Filing: 1955-09-12
•
Granted: 1958-10-14
•
Expires: 1975-09-12
Abstract
No abstract record available.
Inventors
- 👤 Stein Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:43
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/10; A; A61; A61L; A61L9/00; A61L9/16; A61L9/18; A61L9/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2628083A
Cited
US2638644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |