US3695478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexibly deformable stopper for a hypodermic syringe
Assignee: Individual
•
Filing: 1970-08-10
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Granted: 1972-10-03
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Expires: 1990-08-10
Abstract
Abstract A flexibly deformable stopper for a hypodermic syringe consisting of a neck having a central channel, a diaphragm at one end of the neck and an annular flange having a quadrangular cross-section at the closed end. The front face and the rear face of the flange enclose an acute angle with the neck and extend in the same direction, the outer edge projecting beyond the front side of the diaphragm in such manner that during the clamping operation of the flange the diaphragm is pre-stretched.
Inventors
- 👤 Tjwan Khing Sie
- 👤 Hendrik Alle Post
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:02
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/28; A61M5/285; A61M5/286; B; B65; B65D; B65D51/00; B65D51/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
A stopper of flexibly deformable material for a hypodermic syringe comprising a neck having a central channel being open at one end thereof and closed at its other end, a diaphragm forming the closure at the closed end of said neck, an annular flange attached to said neck at its closed end, said flange having a quadrangular cross-section, a front face and a rear face extending in parallel directions and forming acute angles with the center line of the neck in the direction of the closed end, the outer edge of the front face projecting beyond the front of the diaphragm remote from the neck whereby the diaphragm will be stretched when said flange is clamped in the syringe.
Claim 2
Dependent Claim
119 words
A stopper of flexibly deformable material for a hypodermic syringe comprising a neck having a central channel being open at one end thereof and closed at its other end, a diaphragm forming the closure at the closed end of said neck, an annular flange attached to said neck at its closed end, said flange having a quadrangular cross-section, a front face and a rear face extending in parallel directions and forming acute angles with the center line of the neck in the direction of the closed end, the outer edge of the front face projecting beyond the front of the diaphragm remote from the neck whereby the diaphragm will be stretched when said flange is clamped in the syringe.
Claim 3
Dependent Claim
38 words
The stopper according to claim 1 wherein said flange has a substantially rhombic cross-section the sides of which form describing lines of four conical surfaces, the apices of which are located on the center line of the neck.
Claim 4
Dependent Claim
42 words
The stopper according to claim 1 further comprising a rounded section connecting the face of the flange with the outer circumference of the neck, the axial wall thickness of said rounded section being smaller than the maximum axial thickness of the flange.
Claim 5
Dependent Claim
57 words
The stopper according to claim 1 wherein the radial distance from said outer edge of the front face projecting beyond the front of the diaphragm to the center line of said neck is larger than the radial distance from the outer edge of the rear face closest to said neck to the center line of said neck.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |