Patent US3816981A successfully refreshed from Google Patents.
US3816981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary air filter
Assignee: Sperry Rand Belgium NV
•
Filing: 1972-05-19
•
Granted: 1974-06-18
•
Expires: 1992-05-19
Abstract
Abstract A rotary air filter for a radiator or the like. The filter screen is rotatably installed with the characteristic that between the free circumferential edge of the filter screen and the immovable part along which the latter rotates, an open circumferential gap is provided and that the fan which displaces the air that is to be filtered, is installed in such respect to the aforesaid open gap so that the latter is situated at the pressure side of the aforesaid fan.
Inventors
- 👤 J Carnewal
- 👤 T Decruyenare
- 👤 G Mesure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:35
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/12; B; B01; B01D; B01D45/00; B01D45/12; B01D45/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
In combination with a radiator mounted within a casing having a generally circular collar portion which defines a generally circular opening to the front side of the radiator; the combination therewith of a fan rotatably mounted forwardly of the collar and drive means for rotating the fan to force filtered air through said opening and said radiator, and a rotary air filter assembly having a filtering structure circular in cross-section including drive means disposed forwardly of said fan and having a rotatable circumferential member attached thereto disposed circumferentially about said fan, the circumferential member being impervious and spaced away from the collar portion to provide a generally circumferential gap thereabout, the fan blades extending beyond said collar to create at least a small overpressure at the location of the gap during rotation of the fan thereby preventing atmospheric air from penetrating said gap during the operation of said fan.
Claim 2
Dependent Claim
149 words
In combination with a radiator mounted within a casing having a generally circular collar portion which defines a generally circular opening to the front side of the radiator; the combination therewith of a fan rotatably mounted forwardly of the collar and drive means for rotating the fan to force filtered air through said opening and said radiator, and a rotary air filter assembly having a filtering structure circular in cross-section including drive means disposed forwardly of said fan and having a rotatable circumferential member attached thereto disposed circumferentially about said fan, the circumferential member being impervious and spaced away from the collar portion to provide a generally circumferential gap thereabout, the fan blades extending beyond said collar to create at least a small overpressure at the location of the gap during rotation of the fan thereby preventing atmospheric air from penetrating said gap during the operation of said fan.
Claim 3
Dependent Claim
46 words
The combination set forth in claim 1 further characterized by the provision of a forwardly extending shaft having a center line generally concentric with the generally circular opening in the casing, the fan and the rotary air filter assembly being journalled for rotation about said shaft.
Claim 4
Dependent Claim
46 words
The combination set forth in claim 1 in which the rotary air filter assembly is supported on a shaft perpendicular to and concentric with the generally circular opening in the casing, the rotary air filter assembly being driven by a second fan journalled about said shaft.
Claim 5
Dependent Claim
67 words
The combination set forth in claim 1 in which said filtering structure has a generally cylindrical portion and a forward generally circular portion, the combination further being characterized by the provision of an impervious segment disposed within the cylindrical portion, the impervious segment having a radially directed strip or extension that is directed towards the circular portion of the filter structure but which does not touch it.
Claim 6
Dependent Claim
47 words
The combination set forth in claim 1 in which the circumferential member and the filtering structure of the rotary air filter assembly are joined together and are mounted with respect to the fan to rotate about an axis concentric with the axis of rotation for the fan.
Claim 7
Dependent Claim
55 words
The combination set forth in claim 5 in which the circumferential member is formed by a ring of which both sides are bent, this ring having a conical extension with a bent free wall adapted to meet with the rearward edge of said filtering structure to center the later with respect to said circumferential member.
References Cited (Backward Citations)
US1860697A
Cited
US2441631A
Cited
US3002585A
Cited
US3292347A
Cited
US3392512A
Cited
US3475883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |