US2562331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: Individual
•
Filing: 1949-05-25
•
Granted: 1951-07-31
•
Expires: 1969-05-25
Abstract
No abstract record available.
Inventors
- 👤 Phelps William Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:11
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; F02M35/02475; F02M35/02483
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1954-07-30 | 1955-01-29 | 1955-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-30 | 1959-01-29 | 1959-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-30 | 1963-01-29 | 1963-07-31 | $7700.00 | Window Closed / Lapsed |