US4135021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Net-like product produced by stretching a film composed of two incompatible polymers
Assignee: Smith and Nephew Extruded Films Ltd
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Filing: 1976-06-15
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Granted: 1979-01-16
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Expires: 1996-06-15
Abstract
Abstract A net formed integrally of blended incompatible polymers, with parallel smooth longitudinal ribs interconnected by a plurality of split strands non-uniformly interspersed with a plurality of differently sized voids, by stretching a film with a generally longitudinal set of parallel primary grooves and a transverse or angled set, on the other surface, of parallel secondary grooves.
Inventors
- 👤 Albert G. Patchell
- 👤 William O. Murphy
- 👤 Ronald Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:57
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; B; B29; B29D; B29D28/00; A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/2002; A61F13/202; A61F13/51; A61F2013/51078; B29K; B29K2105/00; B29K2105/0088; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24298
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A netted material integrally formed in a synthetic polymeric material and possessing straight smooth parallel longitudinal ribs interconnected by a plurality of fibrillated and split strands exhibiting a plurality of small fibres non-uniformly interspersed with a plurality of differently sized voids permeable to blood and water, the longitudinal ribs and the small fibres oriented by the biaxial stretching of the material and the synthetic polymeric material consisting of a blend of at least two incompatible polymers to provide a non-lustrous appearance and easy splitting of the interconnecting strands the blend comprising a mixture of a major proportion by weight of a polyolefin and a minor proportion by weight of a polymer containing an aryl group.
Claim 2
Dependent Claim
115 words
A netted material integrally formed in a synthetic polymeric material and possessing straight smooth parallel longitudinal ribs interconnected by a plurality of fibrillated and split strands exhibiting a plurality of small fibres non-uniformly interspersed with a plurality of differently sized voids permeable to blood and water, the longitudinal ribs and the small fibres oriented by the biaxial stretching of the material and the synthetic polymeric material consisting of a blend of at least two incompatible polymers to provide a non-lustrous appearance and easy splitting of the interconnecting strands the blend comprising a mixture of a major proportion by weight of a polyolefin and a minor proportion by weight of a polymer containing an aryl group.
Claim 3
Dependent Claim
20 words
A netted material as claimed in claim 1 with a weight of from 2 to 10 grams per square meter.
Claim 4
Dependent Claim
20 words
A netted material as claimed in claim 2 with a weight of from 5 to 8 grams per square meter.
Claim 5
Dependent Claim
19 words
A netted material as claimed in claim 1, in which the residual structure of the strands is still visible.
Claim 6
Dependent Claim
32 words
A netted material as claimed in claim 1, in which the polyolefin is chosen from the group consisting of polyethylene, polypropylene, copolymers thereof and the aryl-group-containing polymer is a high impact polystyrene.
Claim 7
Dependent Claim
28 words
A netted material as claimed in claim 1 in which the polymer contains up to 5% by weight of a filler material to assist in delustring the material.
Claim 8
Dependent Claim
26 words
A netted material as claimed in claim 1 wherein the softness index, measured as the ratio of longitudinal to transverse flexural rigidity is at least 6.
Claim 9
Dependent Claim
23 words
A netted material as claimed in claim 1 in which the proportion of the aryl-group-containing polymer is not greater than 40% by weight.
Claim 10
Dependent Claim
22 words
A netted material as claimed in claim 8 in which the proportion of aryl-group-containing polymer is not greater than 20% by weight.
Claim 11
Dependent Claim
144 words
A netted material integrally formed in a synthetic polymeric material and possessing straight smooth parallel longitudinal ribs interconnected by a plurality of small fibres non-uniformly interspersed with a plurality of differently sized voids permeable to blood and water and oriented by the biaxial stretching of the material, the synthetic polymeric material consisting of an incompatible blend of at least one polyolefin chosen from the group consisting of polyethylene and polypropylene in admixture with not more than 20 percent by weight of high-impact polystyrene and being itself compounded with up to 5 percent by weight of a filler material, the netted material thereby possessing a non-lustrous appearance and easy splitting of the interconnecting strands and having a weight of from 2 to 10 grams per square meter and a softness indix measured as the ratio of longitudinal to transverse flexural rigidity of at least 6.
Claim 12
Dependent Claim
144 words
A netted material integrally formed in a synthetic polymeric material and possessing straight smooth parallel longitudinal ribs interconnected by a plurality of small fibres non-uniformly interspersed with a plurality of differently sized voids permeable to blood and water and oriented by the biaxial stretching of the material, the synthetic polymeric material consisting of an incompatible blend of at least one polyolefin chosen from the group consisting of polyethylene and polypropylene in admixture with not more than 20 percent by weight of high-impact polystyrene and being itself compounded with up to 5 percent by weight of a filler material, the netted material thereby possessing a non-lustrous appearance and easy splitting of the interconnecting strands and having a weight of from 2 to 10 grams per square meter and a softness indix measured as the ratio of longitudinal to transverse flexural rigidity of at least 6.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |