Patent US2516340A successfully refreshed from Google Patents.
US2516340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier
Assignee: GEORGE E ROHRBACH
•
Filing: 1945-02-20
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Granted: 1950-07-25
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Expires: 1965-02-20
Abstract
No abstract record available.
Inventors
- 👤 Pasquale M Pirchio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:01
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US718591A
Cited
US1574713A
Cited
US1560790A
Cited
US1728140A
Cited
FR623254A
Cited
US1739372A
Cited
US1758881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |