US1914667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: HOLLAND FURNACE CO
•
Filing: 1931-06-29
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Granted: 1933-06-20
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Expires: 1951-06-29
Abstract
No abstract record available.
Inventors
- 👤 John P Kolla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:06
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; F24F11/32; F24F11/39; F24F8/00; F24F8/10; F24F8/108
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) | 1936-06-19 | 1936-12-19 | 1937-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-19 | 1940-12-19 | 1941-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-19 | 1944-12-19 | 1945-06-20 | $7700.00 | Window Closed / Lapsed |