US2617860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air ionizing device for air conditioning purposes
Assignee: Hydro Nitro S A
•
Filing: 1949-11-15
•
Granted: 1952-11-11
•
Expires: 1969-11-15
Abstract
No abstract record available.
Inventors
- 👤 Kudelski Stefan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:21
CPC Classifications
H; H01; H01T; H01T23/00; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/33; Y; Y10; Y10S; Y10S422/00; Y10S422/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1796214A
Cited
US2060842A
Cited
GB392873A
Cited
US2094351A
Cited
US2104463A
Cited
US2313917A
Cited
US2276832A
Cited
US2374781A
Cited
US2484202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |