Patent US5063025A successfully refreshed from Google Patents.
US5063025A
Expired / Lapsed
US
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Analytical microsyringe with a superelastic plunger
Assignee: Ito Corp
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Filing: 1990-02-20
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Granted: 1991-11-05
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Expires: 2010-02-20
Abstract
Abstract An analytical microsyringe includes a syringe body, an injection needle fixed to the inner surface at one end of the syringe body, a linear plunger formed of superelastic wire and a knob integrally fixed to the rear end of the linear plunger. The linear plunger has the front end thereof formed to have a diameter large enough to tightly and slidably contact the inner surface of the syringe body and a portion thereof other than the large-diameter front end formed to have a smaller diameter and keep clear of the inner surface of the syringe body.
Inventors
- 👤 Tatsuharu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 01:38
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31511; B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/022; A61M5/31525; A61M5/31531
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
An analytical microsyringe comprising: a syringe body having an inner surface; an injection needle fixed to the inner surface of said syringe body at one end of said syringe body; a linear plunger formed of superelastic wire and having one end thereof formed to have a diameter large enough to tightly and slidably contact the inner surface of said syringe body and a portion thereof other than the large-diameter end formed to have a smaller diameter and keep clear of the inner surface of said syringe body; and a knob integrally fixed to the other end of said linear plunger.
Claim 2
Dependent Claim
100 words
An analytical microsyringe comprising: a syringe body having an inner surface; an injection needle fixed to the inner surface of said syringe body at one end of said syringe body; a linear plunger formed of superelastic wire and having one end thereof formed to have a diameter large enough to tightly and slidably contact the inner surface of said syringe body and a portion thereof other than the large-diameter end formed to have a smaller diameter and keep clear of the inner surface of said syringe body; and a knob integrally fixed to the other end of said linear plunger.
Claim 3
Dependent Claim
17 words
An analytical microsyringe according to claim 1, wherein said superelastic wire is made of a superelastic alloy.
Claim 4
Dependent Claim
18 words
An analytical microsyringe according to claim 1, wherein said superelastic wire is made of an superelastic amorphous alloy.
Claim 5
Dependent Claim
24 words
An analytical microsyringe according to claim 1, wherein said linear plunger is made of a braided cord composed of a plurality of superelastic wires.
Claim 6
Dependent Claim
22 words
An analytical microsyringe according to claim 1, wherein said linear plunger has an outer surface thereof formed with a protective coating layer.
Claim 7
Dependent Claim
26 words
An analytical microsyringe according to claim 5, wherein said protective coating layer is of a thermoplastic resin coated on the outer surface of said linear plunger.
Claim 8
Dependent Claim
26 words
An analytical microsyringe according to claim 5, wherein said protective coating layer is of nickel or chromium plated on the outer surface of said linear plunger.
Claim 9
Dependent Claim
16 words
An analytical microsyringe according to claim 6, wherein said thermoplastic resin is polytetrafluorethylene, polyethylene or polypropylene.
References Cited (Backward Citations)
US3232117A
Cited
US3537453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |