Patent US3699749A successfully refreshed from Google Patents.
US3699749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automobile carburator air intake filters
Assignee: Individual
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Filing: 1971-05-18
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Granted: 1972-10-24
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Expires: 1991-05-18
Abstract
Abstract An annular pleated filter element with a anti-pollution warning reed compression collar device secured to the filtering paper through an aperture within a pleat.
Inventors
- 👤 Raymond M Nowicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:29
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/08; F02M35/09; Y; Y10; Y10S; Y10S116/00; Y10S116/25; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
An air intake filter element having an annulus of pleated filter paper provided with an aperture extending through the wall thereof, a collar member provided with a tube of a size corresponding to the aperture extending through the aperture, said tube having spaced radially extending outer walls between which the filter paper is secured, the tube having an inner annular seat, a porous screen extending across the tube seated on the seat, an O-ring seated on the screen and overlying the seat, and a calibrated vacuum sensing articulating reed member press fitted into contact with the tube and seated on the Oring, whereby said collar member functions as a warning device indicating clogged filter paper.
Claim 2
Dependent Claim
115 words
An air intake filter element having an annulus of pleated filter paper provided with an aperture extending through the wall thereof, a collar member provided with a tube of a size corresponding to the aperture extending through the aperture, said tube having spaced radially extending outer walls between which the filter paper is secured, the tube having an inner annular seat, a porous screen extending across the tube seated on the seat, an O-ring seated on the screen and overlying the seat, and a calibrated vacuum sensing articulating reed member press fitted into contact with the tube and seated on the Oring, whereby said collar member functions as a warning device indicating clogged filter paper.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |