US3864109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Inter-Nation Research Corp
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Filing: 1974-06-26
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Granted: 1975-02-04
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Expires: 1994-06-26
Abstract
Abstract An air filter for use with internal combustion engines is constructed which comprises a housing having an air inlet and a filtered air outlet, a plurality of filter elements placed one atop the other inside the housing and means for conveying filtered air to the engine.
Inventors
- 👤 Erik J Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:23
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0002; B01D46/0012; B01D46/0004; B01D46/56; B01D46/58; B01D46/60; F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; F02M35/16; F02M35/164; B01D2279/00; B01D2279/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
An air filter for use with internal combustion engines which comprises a substantially cylindrical housing, the top portion of which terminates in an air-inlet portion, a filtered air outlet disposed through the bottom of said housing, a plurality of filter elements having a central opening and a perforated cover placed one atop the other inside the housing, said filter elements being substantially equidistantly spaced from the interior cylindrical walls of the housing and means for deflecting air around the filter elements and means for covering the central opening in the uppermost filter element.
Claim 2
Dependent Claim
93 words
An air filter for use with internal combustion engines which comprises a substantially cylindrical housing, the top portion of which terminates in an air-inlet portion, a filtered air outlet disposed through the bottom of said housing, a plurality of filter elements having a central opening and a perforated cover placed one atop the other inside the housing, said filter elements being substantially equidistantly spaced from the interior cylindrical walls of the housing and means for deflecting air around the filter elements and means for covering the central opening in the uppermost filter element.
Claim 3
Dependent Claim
16 words
An air filter according to claim 1 wherein the filter elements are substantially cylindrical filter cartridges.
Claim 4
Dependent Claim
16 words
An air filter according to claim 2 wherein adjacent filter cartridges are secured to one another.
Claim 5
Dependent Claim
17 words
An air filter according to claim 3 which comprises a ''''rain-hat'''' secured to the air inlet portion.
References Cited (Backward Citations)
US2338346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |