Patent US1857512A successfully refreshed from Google Patents.
US1857512A
Expired / Lapsed
US
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Air cleaning and moistening device
Assignee: Individual
•
Filing: 1930-11-18
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Granted: 1932-05-10
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Expires: 1950-11-18
Abstract
No abstract record available.
Inventors
- 👤 Ralph D Matteson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:19
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/04
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) | 1935-05-10 | 1935-11-09 | 1936-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-10 | 1939-11-09 | 1940-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-10 | 1943-11-09 | 1944-05-10 | $7700.00 | Window Closed / Lapsed |