US3677448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Syringe with wire plunger for dispensing infinitesimally small, accurately measured quantities of fluid
Assignee: PRECISION SAMPLING CORP
•
Filing: 1971-01-29
•
Granted: 1972-07-18
•
Expires: 1991-01-29
Abstract
Abstract A syringe for use in dispensing infinitesimally small, accurately measured quantities of fluid. The syringe is comprised generally of a tubular body, a needle and lateral vent-valve assembly mounted in the forward end of the tubular body. The needle and lateral vent-valve assembly comprises a resilient tubular body, a tubular plunger guide mounted at one side thereof and within the axial opening of the tubular body, a needle mounted on the resilient tubular body at the forward or opposite side of the tubular guide and an on-off valved lateral vent communicated to the bores through the hollow needle, the resilient tubular member and the plunger guide. The plunger assembly includes a telescoping tubular member which is reciprocably mounted upon the plunger guide, and a wire plunger associated therewith which extends through the bore of the plunger guide, the resilient tubular member with which it is snugly fitted and sealed, and is loosely fitted through the bore of the needle. The wire plunger traverses the length of the needle and the annulus formed between the external surface of the plunger and inter wall surface of the needle can be readily cleaned or filled with an accurately measured quantity of fluid when the valve is open and injected when the valve is closed.
Inventors
- 👤 Rano J Harris Sr
- 👤 Rano J Harris Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:16
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/022
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
343 words
In a syringe for dispensing infinitesimally small, accurately measured quantities of fluids the combination comprising a tubular body formed by an enclosing wall defining an axial opening, a needle and lateral vent-valve assembly mounted at the forward end of the said tubular body wherein is included a resilient tubular member formed by an enclosing wall defining an axial opening, sealing the forward end of the said tubular body, a hollow needle, provided with a side opening, mounted within the axial opening at the forward end of the said resilient tubular member, said needle being inserted within the axial opening to a depth sufficient that the side opening lies within the axial opening of the said resilient tubular member, a tubular plunger guide, formed by an enclosing wall providing an axial bore through the said guide, a portion of which lies within the said tubular body and a terminal portion of which is snugly mounted and sealed within the axial opening of the said resilient tubular member, at the side opposite the hollow needle, a lateral opening within the said resilient tubular member connecting with and adjoining the side opening of the hollow needle, valve means for opening and closing the said lateral opening, a plunger assembly mounted at the end of the said tubular body, opposite the needle and lateral vent-valve assembly, wherein is included a tubular member telescoped upon the said tubular plunger guide, reciprocably movable thereon and within the axial opening of the said tubular body, a thin wire plunger, affixed at an end to the rear of the tubular member, extending within the bore of the said tubular plunger guide, through the axial opening of the resilient tubular member and the bore of the needle, the inside diameter of which needle opening is greater than the external diameter of the said wire plunger, whereby when the valve is open, fluid can be withdrawn or capillaried into the said annular opening of the needle as for cleaning purposes, and for measurement of the fluid therein in the quantity desired for dispensing.
Claim 2
Dependent Claim
343 words
In a syringe for dispensing infinitesimally small, accurately measured quantities of fluids the combination comprising a tubular body formed by an enclosing wall defining an axial opening, a needle and lateral vent-valve assembly mounted at the forward end of the said tubular body wherein is included a resilient tubular member formed by an enclosing wall defining an axial opening, sealing the forward end of the said tubular body, a hollow needle, provided with a side opening, mounted within the axial opening at the forward end of the said resilient tubular member, said needle being inserted within the axial opening to a depth sufficient that the side opening lies within the axial opening of the said resilient tubular member, a tubular plunger guide, formed by an enclosing wall providing an axial bore through the said guide, a portion of which lies within the said tubular body and a terminal portion of which is snugly mounted and sealed within the axial opening of the said resilient tubular member, at the side opposite the hollow needle, a lateral opening within the said resilient tubular member connecting with and adjoining the side opening of the hollow needle, valve means for opening and closing the said lateral opening, a plunger assembly mounted at the end of the said tubular body, opposite the needle and lateral vent-valve assembly, wherein is included a tubular member telescoped upon the said tubular plunger guide, reciprocably movable thereon and within the axial opening of the said tubular body, a thin wire plunger, affixed at an end to the rear of the tubular member, extending within the bore of the said tubular plunger guide, through the axial opening of the resilient tubular member and the bore of the needle, the inside diameter of which needle opening is greater than the external diameter of the said wire plunger, whereby when the valve is open, fluid can be withdrawn or capillaried into the said annular opening of the needle as for cleaning purposes, and for measurement of the fluid therein in the quantity desired for dispensing.
Claim 3
Dependent Claim
103 words
The apparatus of claim 1 wherein the lateral opening extends through the resilient tubular member and the valve means for opening and closing the said lateral opening comprises a hollow stem, closed at one end and provided with a side opening, reciprocably mounted within the lateral opening of the resilient tubular member so that the open end of the stem is perpetually open to the atmosphere and the side opening of the stem can be communicated with the needle side opening at one stem position to open the valve, or moved out of communication with the needle side opening to close the valve.
Claim 4
Dependent Claim
14 words
The apparatus of claim 2 wherein the resilient tubular member is constructed of Teflon.
Claim 5
Dependent Claim
26 words
The apparatus of claim 3 wherein a push button is mounted On the closed end of the stem to facilitate opening and closing of the valve.
Claim 6
Dependent Claim
141 words
The apparatus of claim 2 wherein the hollow needle is provided with a projecting lug located between the tip and the side opening of the needle, the forward and rearward sides of the resilient tubular member are of smaller diameter than the center portion of the said tubular member and provided with external threads, the forward end of the tubular body is provided with an internally threaded collar for threadable engagement with the rearward shank, the forward shank is provided with a recess within which the lug can lie for maintenance of the proper orientation and stability of the needle, and for threadable engagement with an externally threaded needle hub through a central opening of which the needle can be projected and held in place by threadable engagement between the needle hub and forward end of the said resilient tubular member.
Claim 7
Dependent Claim
63 words
The apparatus of claim 2 wherein the plunger assembly is comprised of an end button, a tubular member mounted perpendicularly upon a face of the said end button, the said tubular member having an internal diameter substantially equal to the external diameter of the plunger guide upon which it is mounted, and the wire plunger is affixed upon the face of the button.
Claim 8
Dependent Claim
25 words
The apparatus of claim 6 wherein the plunger group extends through a central opening within a ferrule mounted on the rear of the tubular body.
Claim 9
Dependent Claim
79 words
The apparatus of claim 6 wherein the tubular body is constructed of a transparent plastic material scribed with indicia marks, the forward portion of the plunger guide is provided with an enlarged collar, the rear portion of which coincides with the zero fill position defined by the scribed indicia marks, and the forward end of the tubular member of the plunger group abuts the collar when the tip of the wire plunger lies at the tip of the needle.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |