US3863807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid dispensing and transfer device
Assignee: SAID SHAPIRO
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Filing: 1974-02-20
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Granted: 1975-02-04
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Expires: 1994-02-20
Abstract
Abstract A dispensing and transfer pipet having a calibrated barrel and a thumb-actuated dispensing plunger. The plunger has a connection rod extending parallel to the barrel and adjustably attached thereto is a transparent collar member slidably mounted on the barrel and having an index line overlying the calibrations on the barrel. A spring biases the plunger upwardly to bring the collar member against and within a finger grip and guard member installed on the top portion of the barrel. The finger grip and guard member has opposite laterally extending finger-engaging wings and a pair of depending spaced parallel guard flanges between which the transparent collar member is receivable. The normal position of the plunger above the bottom of the barrel, and hence the total intake volume of the pipet, can be set by adjusting the connection of the transparent collar member to the connection rod, for which purpose a manually operated thumb screw is provided. The pipet may be employed either with a liquid container having suitable dispensing check valves and an outlet dispensing conduit, or alternatively, with a liquid transfer syringe vessel.
Inventors
- 👤 Justin Joel Shapiro
- 👤 John W G Chin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:20
CPC Classifications
G; G01; G01F; G01F11/00; G01F11/02; G01F11/04; G01F11/06; B; B01; B01L; B01L3/00; B01L3/02; B01L3/0282
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
178 words
A liquid dispensing device comprising a barrel having fluid conduit means at one end, a scale on said barrel, a movable plunger in said barrel and extending from its other end, a collar member surrounding, slidably engaging, and being longitudinally movable on said barrel, index means on said collar member arranged to overly said scale, a connection rod extending parallel to and adjacent said barrel, means rigidly connecting said connection rod to the external portion of said plunger, means to rigidly connect said connection rod to said collar member, whereby said index means moves relative to said scale in accordance with the positioning of the plunger in said barrel, spring means biasing the plunger outwardly relative to the barrel, and stop means on the barrel engageable by said collar member to limit extension of the plunger, wherein said stop means includes a pair of opposite laterally outwardly extending finger-grip wing elements, and wherein said stop means includes a pair of depending finger guard flanges inwardly adjacent said wing elements, said collar member being receivable between said guard flanges.
Claim 2
Dependent Claim
178 words
A liquid dispensing device comprising a barrel having fluid conduit means at one end, a scale on said barrel, a movable plunger in said barrel and extending from its other end, a collar member surrounding, slidably engaging, and being longitudinally movable on said barrel, index means on said collar member arranged to overly said scale, a connection rod extending parallel to and adjacent said barrel, means rigidly connecting said connection rod to the external portion of said plunger, means to rigidly connect said connection rod to said collar member, whereby said index means moves relative to said scale in accordance with the positioning of the plunger in said barrel, spring means biasing the plunger outwardly relative to the barrel, and stop means on the barrel engageable by said collar member to limit extension of the plunger, wherein said stop means includes a pair of opposite laterally outwardly extending finger-grip wing elements, and wherein said stop means includes a pair of depending finger guard flanges inwardly adjacent said wing elements, said collar member being receivable between said guard flanges.
Claim 3
Dependent Claim
35 words
The liquid dispensing device of claim 1, and wherein the means to rigidly connect the connection rod to said collar member comprises means to adjust the position of said collar member along the connection rod.
Claim 4
Dependent Claim
62 words
The liquid dispensing device of claim 1, and wherein said connection rod extends through said collar member and wherein said means to rigidly connect the connection rod to the collar member comprises a clamping screw threadedly engaged in the collar member and being clampingly engageable with the connection rod, whereby the collar member may be adjusted in position along the connection rod.
Claim 5
Dependent Claim
23 words
The liquid dispensing device of claim 3, and wherein said depending finger guard flanges extend rearwardly sufficiently to receive the connection rod therebetween.
Claim 6
Dependent Claim
93 words
The liquid dispensing device of claim 1, and a liquid reservoir provided with removable top cover means, a dispensing valve assembly mounted subjacent said top cover means, said valve assembly including intake conduit means depending into the reservoir and externally extending discharge conduit means, said dispensing valve assembly having a flow passage, means to connect said first-named fluid conduit means to said flow passage, and respective intake and discharge check valve elements between the depending conduit means and the flow passage and between the flow passage and the externally extending discharge conduit means.
Claim 7
Dependent Claim
207 words
A liquid dispensing device comprising a barrel having fluid conduit means at one end, a scale on said bArrel, a movable plunger in said barrel and extending from its other end, a collar member surrounding, slidably engaging, and being longitudinally movable on said barrel, index means on said collar member arranged to overly said scale, a connection rod extending parallel to and adjacent said barrel, means rigidly connecting said connection rod to the external portion of said plunger, means to rigidly connect said connection rod to said collar member, whereby said index means moves relative to said scale in accordance with the positioning of the plunger in said barrel, an enlarged operating head member on the top end of the plunger, spring means surrounding the plunger and bearing between the top of the barrel and said operating head member, biasing the plunger upwardly, a stop member mounted on the top portion of the barrel, said stop member being engageable by the collar member to limit upward extension of the plunger and being provided with opposite outwardly extending finger-grip wing elements, and a pair of finger guard flanges depending from said stop member inwardly adjacent said wing elements and being spaced apart to receive the collar member therebetween.
Claim 8
Dependent Claim
207 words
A liquid dispensing device comprising a barrel having fluid conduit means at one end, a scale on said bArrel, a movable plunger in said barrel and extending from its other end, a collar member surrounding, slidably engaging, and being longitudinally movable on said barrel, index means on said collar member arranged to overly said scale, a connection rod extending parallel to and adjacent said barrel, means rigidly connecting said connection rod to the external portion of said plunger, means to rigidly connect said connection rod to said collar member, whereby said index means moves relative to said scale in accordance with the positioning of the plunger in said barrel, an enlarged operating head member on the top end of the plunger, spring means surrounding the plunger and bearing between the top of the barrel and said operating head member, biasing the plunger upwardly, a stop member mounted on the top portion of the barrel, said stop member being engageable by the collar member to limit upward extension of the plunger and being provided with opposite outwardly extending finger-grip wing elements, and a pair of finger guard flanges depending from said stop member inwardly adjacent said wing elements and being spaced apart to receive the collar member therebetween.
Claim 9
Dependent Claim
121 words
A liquid dispensing device comprising a barrel having fluid conduit means at one end, a movable plunger in said barrel and extending from its other end, a collar member surrounding, slidably engaging, and being longitudinally movable on said barrel, a connection rod extending parallel to and adjacent said barrel, means rigidly connecting said connection rod to the external portion of said plunger, means to rigidly connect said connection rod to said collar member, whereby said collar member moves relative to said barrel in accordance with the positioning of the plunger in said barrel, and finger-gripping means on the barrel including depending guard flange means adjacent opposite sides of the barrel and spaced therefrom to at times receive said collar member therebetween.
Claim 10
Dependent Claim
121 words
A liquid dispensing device comprising a barrel having fluid conduit means at one end, a movable plunger in said barrel and extending from its other end, a collar member surrounding, slidably engaging, and being longitudinally movable on said barrel, a connection rod extending parallel to and adjacent said barrel, means rigidly connecting said connection rod to the external portion of said plunger, means to rigidly connect said connection rod to said collar member, whereby said collar member moves relative to said barrel in accordance with the positioning of the plunger in said barrel, and finger-gripping means on the barrel including depending guard flange means adjacent opposite sides of the barrel and spaced therefrom to at times receive said collar member therebetween.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |