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Patent US4412836A successfully refreshed from Google Patents.
US4412836A
Expired / Lapsed
US
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Syringe assembly
Assignee: West Pharmaceutical Services Inc
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Filing: 1981-12-11
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Granted: 1983-11-01
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Expires: 2001-12-11
Abstract
Abstract A syringe assembly comprising a casing for a medicament or the like having a discharge opening at one end, a diaphragm assembly mounted at said end normally sealing said contents, plunger means movable in said casing and operable upon displacement in one direction to effect increase in pressure in said casing to rupture or displace said diaphragm to permit discharge of the contents of said casing.
Inventors
- 👤 Dominic J. Brignola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:32
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31596; A61M5/28; A61M5/285; A61M5/286; A61M5/31511; A61M2005/3103; A61M2005/3104; A61M5/3145; A61M5/31515; A61M5/31598
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A plunger for a syringe made of a resilient material comprising a generally cylindrical body portion, a plurality of radial axially spaced ribs on its outer peripheral, a rupturable diaphragm spaced inwardly from opposite axial ends of the body portion, said diaphragm having a localized weakened area to minimize particle formations when the diaphragm ruptures, and also providing a more accurate control of force required to rupture the diaphragm consisting of a crescent-shaped membrane portion of thinner cross section than the remainder defined by the crescent and the circular trace of the diaphragm.
Claim 2
Dependent Claim
93 words
A plunger for a syringe made of a resilient material comprising a generally cylindrical body portion, a plurality of radial axially spaced ribs on its outer peripheral, a rupturable diaphragm spaced inwardly from opposite axial ends of the body portion, said diaphragm having a localized weakened area to minimize particle formations when the diaphragm ruptures, and also providing a more accurate control of force required to rupture the diaphragm consisting of a crescent-shaped membrane portion of thinner cross section than the remainder defined by the crescent and the circular trace of the diaphragm.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |