US2926747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filtering and purifying apparatus for air coolers
Assignee: Dow Silicones Corp
•
Filing: 1959-08-24
•
Granted: 1960-03-01
•
Expires: 1979-08-24
Abstract
No abstract record available.
Inventors
- 👤 Jay L Wright
- 👤 Lewis N Tenney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:23
CPC Classifications
F; F24; F24F; F24F8/00; F24F8/10; F24F8/117; F24F8/125; F24F8/15; F24F8/158
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2146071A
Cited
US2829732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |