US4444330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical container stopper
Assignee: Terumo Corp
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Filing: 1982-07-27
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Granted: 1984-04-24
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Expires: 2002-07-27
Abstract
Abstract A stopper for hermetically sealing the opening of a medical container is made of an injection-moldable polymeric material containing a blend of 30 to 90% by weight of a butyl-based rubber and 70 to 10% by weight of a thermoplastic elastomer.
Inventors
- 👤 Masaaki Kasai
- 👤 Toshiji Ichikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; B; B01; B01L; B01L3/00; B01L3/50; B01L3/508; B01L3/5082; B01L3/50825; C08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08L9/00; C09K2200/00; C09K2200/02; C09K2200/0204; C09K2200/0208; C09K2200/0243; C09K2200/0252; C09K2200/06; C09K2200/0615; C09K2200/0617; C09K2200/062; C09K2200/0622; C09K2200/0632; C09K2200/0645; C09K2200/0655; C09K2200/0687
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
42 words
A medical container stopper for hermetically sealing an opening of a rigid medical container, comprising an injection-moldable polymeric material containing a blend of 30 to 90% by weight of a butyl-based rubber and 70 to 10% by weight of a thermoplastic elastomer.
Claim 2
Dependent Claim
42 words
A medical container stopper for hermetically sealing an opening of a rigid medical container, comprising an injection-moldable polymeric material containing a blend of 30 to 90% by weight of a butyl-based rubber and 70 to 10% by weight of a thermoplastic elastomer.
Claim 3
Dependent Claim
29 words
A stopper according to claim 1, wherein the butyl-based rubber is selected from the group consisting of polyisobutylene, isobutylene-isoprene rubber, partially crosslinked isobutylene-isoprene rubber, and a halogenated isobutylene-isoprene rubber.
Claim 4
Dependent Claim
28 words
A stopper according to claim 2, wherein the thermoplastic elastomer is selected from the group consisting of a polyester elastomer, a styrene-based elastomer, 1,2-polybutadiene, and a polyolefin elastomer.
Claim 5
Dependent Claim
24 words
A stopper according to claim 2, wherein the polymeric material contains no more than 30% by weight of an olefin-based polymer for improving moldability.
Claim 6
Dependent Claim
34 words
A stopper according to claim 4, wherein the olefin-based polymer for improving moldability is selected from the group consisting of polypropylene, polyethylene, an ethylene-ethyl acrylate copolymer, liquid paraffin, wax and an ethylene-vinyl acetate copolymer.
Claim 7
Dependent Claim
29 words
A stopper according to claim 1, wherein the polymeric material contains not more than 80% of a filler based on a total weight of the filler and the mixture.
Claim 8
Dependent Claim
23 words
A stopper according to claim 6, wherein the filler is selected from the group consisting of carbon black, clay, talc, and white carbon.
Claim 9
Dependent Claim
25 words
A stopper according to any one of claims 1 to 7, wherein the stopper has a thin portion through which a cannula may be pierced.
Claim 10
Dependent Claim
38 words
A stopper according to claim 8, comprising a sealing member formed within the thin portion so as to prevent formation of a gap between the stopper and the cannula upon piercing of the cannula through the thin portion.
Claim 11
Dependent Claim
14 words
A stopper according to claim 9, wherein the sealing member comprises a styrene-based elastomer.
Claim 12
Dependent Claim
23 words
A stopper according to claim 9, wherein the sealing member is formed by flowing liquid rubber in a recess in said thin portion.
Claim 13
Dependent Claim
22 words
A stopper according to claim 4 wherein the olefin-based polymer is present in an amount of between 10% and 20% by weight.
Claim 14
Dependent Claim
22 words
A stopper according to claim 1 wherein the butyl-based rubber is present in an amount of between 50% and 70% by weight.
Claim 15
Dependent Claim
21 words
A stopper according to claim 6 wherein the filler is present in an amount of between 20% and 40% by weight.
References Cited (Backward Citations)
US3136440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |