US4635807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stopper for sterile fluid containers
Assignee: Merck Sharp & Dohme LLC
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Filing: 1985-09-03
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Granted: 1987-01-13
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Expires: 2005-09-03
Abstract
Abstract A stopper for holding fluid in a container comprising a body of vulcanized elastomer having a convex surface, and, laminated to the convex surface without adhesive, a thin layer of thermoplastic, which forms a surface intended to contact the fluid and a side of an opening in the container.
Inventors
- 👤 Julius Z. Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:02
CPC Classifications
B; B65; B65D; B65D51/00; B65D51/002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A stopper for holding fluid in a container comprising: (a) a body of vulcanized elastomer having a convex surface and laminated to the convex surface without adhesive, (b) a thin layer of stretched thermoplastic to form a surface intended to contact the fluid and a side of an opening in the container, said thermoplastic having had an elongation of at least 450% prior to stretching.
Claim 2
Dependent Claim
65 words
A stopper for holding fluid in a container comprising: (a) a body of vulcanized elastomer having a convex surface and laminated to the convex surface without adhesive, (b) a thin layer of stretched thermoplastic to form a surface intended to contact the fluid and a side of an opening in the container, said thermoplastic having had an elongation of at least 450% prior to stretching.
Claim 3
Dependent Claim
21 words
A stopper of claim 1 wherein the vulcanized elastomer is selected from the group consisting of natural rubber and butyl rubber.
Claim 4
Dependent Claim
19 words
The stopper of claim 7 wherein the thermoplastic is selected from the group consisting of propylene and propylene copolymer.
Claim 5
Dependent Claim
43 words
The stopper of claim 8 adapted to seal containers of injectable fluid comprising a flat top, an annular convex protrusion from the flat top and a concavity within the protrusion, wherein the layer of thermoplastic is laminated to the annular protrusion and concavity.
Claim 6
Dependent Claim
33 words
The stopper of claim 1 adapted to act as a plunger within a hypodermic syringe and further comprising engagement means on a side of the stopper not intended to contact the injectable fluid.
Claim 7
Dependent Claim
19 words
The stopper of claim 1 wherein the thermoplastic is selected from the group consisting of propylene and propylene copolymers.
Claim 8
Dependent Claim
15 words
The stopper of claim 1 wherein the thermoplastic is a copolymer of propylene and ethylene.
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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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |