US2203570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaning or filtering device
Assignee: Individual
•
Filing: 1938-07-11
•
Granted: 1940-06-04
•
Expires: 1958-07-11
Abstract
No abstract record available.
Inventors
- 👤 Hollebone Joseph Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:23
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/08; B; B01; B01D; B01D46/00; B01D46/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-06-04 | 1943-12-04 | 1944-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-04 | 1947-12-04 | 1948-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-04 | 1951-12-04 | 1952-06-04 | $7700.00 | Window Closed / Lapsed |