US3774508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making filter means
Assignee: Filtrona Richmond Inc
•
Filing: 1972-09-20
•
Granted: 1973-11-27
•
Expires: 1992-09-20
Abstract
Abstract A method and apparatus for making filter means of a type which is constructed to provide elongated, high surface area, cavities defined on opposite sides of a relatively thin wall formed of filtering material with only the ends of the filter means contacting an overwrapped outertube thereby presenting maximum available surface area of the material from which the products are formed to the smoke for filtration is disclosed. A tow of a suitable filtering material is passed through an air nozzle containing a mandrel centered therein, the tow thereby achieving a uniformly random, but tubular, configuration and then through a steam curing station followed by an air curing station. The formed rod is then again steam cured and passes to a crimping device which imparts a particular configuration thereto. The crimped rod is then again air cured, wrapped, and cut. In another embodiment, an additional material may be added by means either of a printing applicator device or a pulsating nozzle device.
Inventors
- 👤 R Berger
- 👤 E Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:40
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0275; A24D3/0283
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
275 words
A stuffer jet assembly comprising a. an outer member having an entrance end and an exit end and including a generally conical inner surface portion intermediate said ends and a generally cylindrical inner surface portion juxtaposed to said exit end; b. an inner member having an entrance end and an exit end and including a generally conical external surface portion juxtaposed to said exit end and a generally conical internal surface extending from said entrance end to said exit end; c. means securing said inner member within said outer member with said conical external surface portion of said inner member spaced from said conical internal surface portion of said outer member to define an annular chamber therebetween, said chamber including an annular opening defined between said inner and outer members at the exit ends of said conical outer and inner surface portions thereof, respectively, said means securing said inner member within said outer member being adjustable axially, whereby the size of said annular opening may be varied; d. passageway means defined in said outer member and communicating with said annular chamber to permit fluid under pressure to be fed into said annular chamber; and e. a mandrel support means secured to said inner member adjacent said entrance end thereof, said mandrel support means including a mandrel support element disposed centrally thereof, and an elongated mandrel means carried within said mandrel support element and extending axially through said inner and outer members to a point beyond exit ends thereof, said mandrel means including an outer surface portion maintained by said mandrel support element in spaced relationship to the inner surfaces of said inner and outer members.
Claim 2
Dependent Claim
275 words
A stuffer jet assembly comprising a. an outer member having an entrance end and an exit end and including a generally conical inner surface portion intermediate said ends and a generally cylindrical inner surface portion juxtaposed to said exit end; b. an inner member having an entrance end and an exit end and including a generally conical external surface portion juxtaposed to said exit end and a generally conical internal surface extending from said entrance end to said exit end; c. means securing said inner member within said outer member with said conical external surface portion of said inner member spaced from said conical internal surface portion of said outer member to define an annular chamber therebetween, said chamber including an annular opening defined between said inner and outer members at the exit ends of said conical outer and inner surface portions thereof, respectively, said means securing said inner member within said outer member being adjustable axially, whereby the size of said annular opening may be varied; d. passageway means defined in said outer member and communicating with said annular chamber to permit fluid under pressure to be fed into said annular chamber; and e. a mandrel support means secured to said inner member adjacent said entrance end thereof, said mandrel support means including a mandrel support element disposed centrally thereof, and an elongated mandrel means carried within said mandrel support element and extending axially through said inner and outer members to a point beyond exit ends thereof, said mandrel means including an outer surface portion maintained by said mandrel support element in spaced relationship to the inner surfaces of said inner and outer members.
Claim 3
Dependent Claim
47 words
A stuffer jet assembly according to claim 1 wherein said means securing said inner member within said outer member include cooperating, generally cylindrical, threaded means defined on the exterior of said inner member and on the interior of said outer member adjacent said entrance ends of each.
Claim 4
Dependent Claim
14 words
A stuffer jet assembly according to claim 1 wherein said mandrel means is hollow.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |