Patent US3570223A successfully refreshed from Google Patents.
US3570223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: Tenneco Inc
•
Filing: 1969-01-31
•
Granted: 1971-03-16
•
Expires: 1989-01-31
Abstract
Abstract A THROW-AWAY TYPE AIR FILTER ASSEMBLY FOR AN INTERNAL COMBUSTION ENGINE INDUCTION SYSTEM. THE AIR CLEANER ASSEMBLY INCLUDES A LONG LIFE FILTER ELEMENT AND A FILTER HOUSING IN WHICH THE ELEMENT IS PERMANENTLY RETAINED SO THAT THE HOUSING AND ELEMENT ARE REPLACED AS A UNIT.
Inventors
- 👤 Louis J Svoren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:32
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |