US2526178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for improving the biological properties of air in rooms
Assignee: Hydro Nitro S A
•
Filing: 1947-11-06
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Granted: 1950-10-17
•
Expires: 1967-11-06
Abstract
No abstract record available.
Inventors
- 👤 Weber Louis Frederic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:09
CPC Classifications
B; B05; B05B; B05B17/00; B05B17/04; B05B5/00; B05B5/025; B05B5/03; B05B5/08; B05B5/10; F; F24; F24F; F24F8/00; F24F8/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1958406A
Cited
US1795875A
Cited
US1855869A
Cited
US2302289A
Cited
US2302185A
Cited
US2391048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |