US4401536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biocompatible, steam-sterilizable irradiated articles comprised of ethylene copolymer and polypropylene blends
Assignee: Delmed Inc
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Filing: 1981-01-23
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Granted: 1983-08-30
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Expires: 2001-01-23
Abstract
Abstract A semi-rigid sterilizable biomedical article for use in handling vital fluids comprising a blend of about 20-50% medical grade radiation-stabilized polypropylene by weight, the balance being a copolymer of ethylene and a comonomer selected from the group consisting of (i) vinyl esters of saturated carboxylic acids having up to 8 carbon atoms in the acid moiety, and (ii) alkyl esters of α,β ethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms in the acid moiety and from 2 to 8 carbon atoms in the alkyl moiety said comonomer comprising about 1-15 mole percent of the copolymer, said article having been irradiated to a dose of ionizing radiation ranging from about 1 to 35 Mrad.
Inventors
- 👤 Edwin O. Lundell
- 👤 George T. Kwiatkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:25
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/70; B29C66/71; A; A61; A61L; A61L2/00; A61L2/02; A61L2/04; A61L2/06; A61L2/07; A61L2/08; B29C66/73; B29C66/739; B29C66/7392; B29C71/00; B29C71/04; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0869; C08L23/10; C08L23/12; B29C65/00; B29C65/02; B29C66/73921; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/08; B29K2023/083; B29K2023/10; B29K2023/12; B29K2033/00; B29K2105/00; B29K2105/0085; B29K2105/0088; B29K2105/24; C08L2203/00; C08L2203/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1345; Y10T428/1352; Y10T428/1397
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A semi-rigid biomedical article for use in handling vital fluids consisting essentially of a blend of about 20-50% medical grade radiation stabilized polypropylene by weight, the balance being a copolymer of ethylene and a comonomer selected from the group consisting of (i) vinyl esters of saturated carboxylic acids having up to 8 carbon atoms in the acid moiety, and (ii) alkyl ester of α,β ethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms in the acid moiety and from 2 to 8 carbon atoms in the alkyl moiety said comonomer comprising about 1-15 mole percent of the copolymer, said article having been irradiated to a dose of ionizing radiation ranging from about 1 to 35 Mrad; steam sterilized; and heat-sealed; said blend being free of toxic amounts of migratable components and possessive of flexibility, tensile and impact strengths suited for handling vital fluids.
Claim 2
Dependent Claim
145 words
A semi-rigid biomedical article for use in handling vital fluids consisting essentially of a blend of about 20-50% medical grade radiation stabilized polypropylene by weight, the balance being a copolymer of ethylene and a comonomer selected from the group consisting of (i) vinyl esters of saturated carboxylic acids having up to 8 carbon atoms in the acid moiety, and (ii) alkyl ester of α,β ethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms in the acid moiety and from 2 to 8 carbon atoms in the alkyl moiety said comonomer comprising about 1-15 mole percent of the copolymer, said article having been irradiated to a dose of ionizing radiation ranging from about 1 to 35 Mrad; steam sterilized; and heat-sealed; said blend being free of toxic amounts of migratable components and possessive of flexibility, tensile and impact strengths suited for handling vital fluids.
Claim 3
Dependent Claim
21 words
The article of claim 1 wherein said ethylene copolymer is selected from the group consisting of ethylene/ethyl acrylate and ethylene/vinyl acetate.
Claim 4
Dependent Claim
21 words
The article of claim 2 wherein said comonomer content ranges from about 3.5 to about 6.5 mole percent of said copolymer.
Claim 5
Dependent Claim
16 words
The article of claim 3 wherein said radiation dose ranges between about 10 and 20 Mrad.
Claim 6
Dependent Claim
17 words
The article of claims 1, 2, 3 or 4 wherein said blend comprises 25% polypropylene by weight.
Claim 7
Dependent Claim
12 words
The article of claim 4 wherein the dose is about 12.5 Mrad.
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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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |