US4743279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: Individual
•
Filing: 1987-08-28
•
Granted: 1988-05-10
•
Expires: 2007-08-28
Abstract
Abstract A filter for mounting on the fresh-air entrance on motor vehicles. The filter is in the form of a cartridge which is designed for mounting on the fresh-air entrance on the vehicle to cover the entrance entirely. The filter comprises a coarse filter for separation of particles entrained in the air and a chemical action filter for chemically cleansing the air entering into the vehicle.
Inventors
- 👤 Ingemar B. G. Kvist
- 👤 Goran A. I. Johansson
- 👤 Kaj U. I. Honig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:50
CPC Classifications
B; B60; B60H; B60H3/00; B60H3/06; B60H3/0608; B60H3/0641
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
An improved filter designed to be mounted on existing motor vehicles on the normally open fresh air entrance thereof, said filter being constructed as a cartridge for external mounting on said fresh air entrance so as to cover the openings thereof, said cartridge comprising an outer housing defining an outlet for convering the openings of the vehicle fresh air entrance, an inlet opening and a filter chamber between said inlet opening and said outlet and said cartridge permanently containing a coarse filter designed to trap particles in the air entering into said motor vehicle, and a chemical action filter arranged to cleanse said air from pollution gases.
Claim 2
Dependent Claim
107 words
An improved filter designed to be mounted on existing motor vehicles on the normally open fresh air entrance thereof, said filter being constructed as a cartridge for external mounting on said fresh air entrance so as to cover the openings thereof, said cartridge comprising an outer housing defining an outlet for convering the openings of the vehicle fresh air entrance, an inlet opening and a filter chamber between said inlet opening and said outlet and said cartridge permanently containing a coarse filter designed to trap particles in the air entering into said motor vehicle, and a chemical action filter arranged to cleanse said air from pollution gases.
Claim 3
Dependent Claim
32 words
An improved filter as claimed in claim 1, comprising a grill positioned across the inlet opening of said cartridge outer housing to separate larger particles, such as leaves, from the entering air.
Claim 4
Dependent Claim
26 words
An improved filter as claimed in claim 1, wherein said coarse filter is a pollen filter designed to trap smaller articles entrained in the incoming air.
Claim 5
Dependent Claim
16 words
An improved filter as claimed in claim 3, wherein said pollen filter is made from fluff.
Claim 6
Dependent Claim
17 words
An improved filter as claimed in claim 1, wherein said chemical action filter consists of active carbon.
References Cited (Backward Citations)
GB1053285A
Cited
US2551923A
Cited
US2660166A
Cited
US3457917A
Cited
US3738621A
Cited
DE2140452A1
Cited
DE2304078A1
Cited
US3941034A
Cited
US4162289A
Cited
US4227446A
Cited
US4252547A
Cited
US4242951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |