US2662609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Productive Inventions Inc
•
Filing: 1949-09-19
•
Granted: 1953-12-15
•
Expires: 1969-09-19
Abstract
No abstract record available.
Inventors
- 👤 Fred A Krohm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:51
CPC Classifications
B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1800326A
Cited
US1918006A
Cited
US1951384A
Cited
US1960260A
Cited
US2171400A
Cited
US2260853A
Cited
US2458745A
Cited
US2474746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |