US4997423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated sliding stopper for a syringe
Assignee: DAIKYO GOMU SEIKO Ltd
•
Filing: 1989-06-14
•
Granted: 1991-03-05
•
Expires: 2009-06-14
Abstract
Abstract A laminated sliding stopper for a syringe, excellent in sliding or moving property and free from contamination of an injection liquid, is provided which consists of a rubber elastic body whose part to be contacted with the injection liquid and sliding part on the inner wall of the barrel are fully laminated with a film of tetrafluoroethylene.
Inventors
- 👤 Tamotsu Okuda
- 👤 Tomoyasu Muraki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:12
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/24; A61M5/2422; A61M5/2429; A61M5/31; A61M5/315; A61M5/31511; A61M5/31513; A61M2205/00; A61M2205/02; A61M2205/0222; A61M2205/0238; A61M2205/58; A61M2205/583
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
A sliding stopper for a syringe, consisting of a rubber elastic body whose part to be contacted with a liquid medicament and sliding part on an inner wall of a barrel are fully laminated with a film of tetrafluoroethylene.
Claim 2
Dependent Claim
39 words
A sliding stopper for a syringe, consisting of a rubber elastic body whose part to be contacted with a liquid medicament and sliding part on an inner wall of a barrel are fully laminated with a film of tetrafluoroethylene.
Claim 3
Dependent Claim
21 words
The sliding stopper as claimed in claim 1, wherein the film of tetrafluoroethylene has a thickness of 0.01 to 0.2 mm.
Claim 4
Dependent Claim
19 words
The sliding stopper as claimed in claim 1, wherein the syringe additionally serves as a container for a medicament.
Claim 5
Dependent Claim
15 words
The sliding stopper as claimed in claim 1, wherein the film of tetrafluoroethylene is colored.
Claim 6
Dependent Claim
34 words
The sliding stopper as claimed in claim 4, wherein the coloring is carried out by the use of a coloring agent selected from the group consisting of ultramarine blue, carbon black and red oxide.
Claim 7
Dependent Claim
35 words
The sliding stopper as claimed in claim 1, wherein the rubber elastic body is made of a rubber or elastic material selected from the group consisting of isoprene, butadiene, styrene-butadiene, ethylene-propylene, isoprene-isobutylene and nitrile rubbers.
References Cited (Backward Citations)
US2735735A
Cited
DE141411C
Cited
US2607342A
Cited
US3628523A
Cited
US3958570A
Cited
JPS5219435A
Cited
JPS5532602A
Cited
US4501192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |