Patent US3465707A successfully refreshed from Google Patents.
US3465707A
Expired / Lapsed
US
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Clogging indicator for air cleaners
Assignee: Mahle Filter Systems Japan Corp
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Filing: 1968-04-23
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Granted: 1969-09-09
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Expires: 1988-04-23
Abstract
No abstract record available.
Inventors
- 👤 Yukio Kashiwaba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:45
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/08; F02M35/09; Y; Y10; Y10S; Y10S55/00; Y10S55/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-08 | 1973-03-10 | 1973-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-08 | 1977-03-10 | 1977-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-08 | 1981-03-10 | 1981-09-09 | $7700.00 | Window Closed / Lapsed |