US4149550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moulded fibrous material
Assignee: Wiggins Teape UK PLC
•
Filing: 1977-07-29
•
Granted: 1979-04-17
•
Expires: 1997-07-29
Abstract
Abstract A fibrous element comprising an elongated structure having a fibrous core with the fibres arranged in random orientation, said core being stiffened and enclosed by a fibrous crust integral with the core and formed as a surface layer of greater density.
Inventors
- 👤 Kieron P. Green
- 👤 Bruce R. Inglis
- 👤 Roger A. Allen
- 👤 Roger W. Tringham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:47
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/04; A24D3/06; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2927; Y10T428/2929; Y10T428/2933
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
51 words
A fibrous element comprising an elongated structure having a fibrous core with discrete fibres arranged in random orientation, said core being stiffened and enclosed by a fibrous crust integral with the core and formed as a surface layer of greater density which also has discrete fibres arranged in a random orientation.
Claim 2
Dependent Claim
51 words
A fibrous element comprising an elongated structure having a fibrous core with discrete fibres arranged in random orientation, said core being stiffened and enclosed by a fibrous crust integral with the core and formed as a surface layer of greater density which also has discrete fibres arranged in a random orientation.
Claim 3
Dependent Claim
26 words
A fibrous element as claimed in claim 1 in which a higher proportion of fibres in the surface layer are orientated lengthwise than in the core.
Claim 4
Dependent Claim
26 words
A fibrous element as claimed in claim 2, which when parted under tension in a lengthwise direction exhibits substantially coniform interfaces at the point of separation.
Claim 5
Dependent Claim
30 words
A fibrous element as claimed in claim 3 in which the fibrous structure has a substantially coniform integrity but contains coniform structures which define at their peripheries the fibrous crust.
Claim 6
Dependent Claim
46 words
A fibrous element as claimed in claim 1 in which the fibrous material of the core and crust contains a proportion of stiff bulky fibres in combination with finer fibres, thus providing a structured matrix to improve the filtration characteristics and strength of the fibrous element.
Claim 7
Dependent Claim
28 words
A fibrous element as claimed in claim 5 in which the stiff bulky fibres are highly extracted alpha cellulose chemically bleached pulps containing a high degree of summerwood.
Claim 8
Dependent Claim
19 words
A fibrous element as claimed in claim 6 in which the fine fibres have a high specific surface area.
Claim 9
Dependent Claim
22 words
A fibrous element as claimed in claim 7 in which the fine fibres are taken from the group esparto, eucalyptus and cotton.
Claim 10
Dependent Claim
24 words
A fibrous element as claimed in claim 5 in which the fine fibres are present in the concentration of 40% to 50% by weight.
Claim 11
Dependent Claim
40 words
A fibrous element as claimed in claim 1 in which the fibrous material of the core and crust contain up to about 10% by weight of an additive from the group comprising kaolin, calcium carbonate, activated carbon and diatomaceous earth.
Claim 12
Dependent Claim
28 words
A fibrous element as claimed in claim 10 wherein a binder from the group comprising starch and wet strength resins is present to prevent fluffing occurring during manufacture.
Claim 13
Dependent Claim
21 words
A fibrous element as claimed in claim 11 in which the wet strength resins are from the group polyamine, and polyethylenamine.
Claim 14
Dependent Claim
22 words
A fibrous element as claimed in claim 1 wherein the surface of the element contains a coating of starch as a binder.
Claim 15
Dependent Claim
16 words
A fibrous element as claimed in claim 1 wherein a proportion of synthetic fibres is present.
Claim 16
Dependent Claim
16 words
A fibrous element as claimed in claim 14 in which the synthetic fibres are polyolefin fibres.
Claim 17
Dependent Claim
11 words
A smoke filter made from the fibrous element of claim 1.
Claim 18
Dependent Claim
13 words
The product of claim 16 wherein the smoke filter is a cigarette filter.
References Cited (Backward Citations)
US2252999A
Cited
US2688380A
Cited
US3095343A
Cited
US3189506A
Cited
US3359148A
Cited
US3418187A
Cited
US3390039A
Cited
US3442739A
Cited
US3595245A
Cited
US3740304A
Cited
US4034765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |