US3591056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipetting syringe of precisely variable displacement volume
Assignee: WHALE Inc
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Filing: 1969-06-12
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Granted: 1971-07-06
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Expires: 1989-06-12
Abstract
Abstract A pipetting syringe of precisely variable displacement volume which includes a dispenser body having a plurality of holes for receiving and holding a removable stop pin in a selected one of the holes and wherein a fill plunger having a projection thereon for engagement with the stop pin is located within the body. An ejection plunger is slidably located within the body and within a longitudinal groove of the fill plunger for ejecting material from the syringe. The stop pin is placed in the desired hole which corresponds to the desired volume to be received and ejected by the syringe and the fill plunger is then pushed forwardly as far as possible and released so that a fill spring mounted within the body and in engagement with the ejection plunger forces the plungers rearwardly. The syringe is thus filled and the material is then ejected by independently pushing the ejection plunger forward.
Inventors
- 👤 Richard J Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:54
CPC Classifications
A; A61; A61M; A61M3/00; B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/0224
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
152 words
A pipetting syringe of precisely variable displacement volume, comprising: a dispenser body with an axial bore therethrough; said body also having a plurality of holes therein for receiving and holding a removable stop pin in a selected one of said holes; a fill plunger at least partially and slidably located within said bore and including a longitudinal groove therein, said fill plunger having a projection for engagement with said stop pin and with the rearward portion of said body, respectively, upon the filling of said syringe; an ejection plunger slidably carried within said bore and within the longitudinal groove of said fill plunger for ejecting material from said syringe; and a fill spring mounted within said bore and at the forward portion of said body for engagement with said body and with said ejection plunger for causing the rearward movement of said fill and ejection plungers when the syringe is being filled.
Claim 2
Dependent Claim
152 words
A pipetting syringe of precisely variable displacement volume, comprising: a dispenser body with an axial bore therethrough; said body also having a plurality of holes therein for receiving and holding a removable stop pin in a selected one of said holes; a fill plunger at least partially and slidably located within said bore and including a longitudinal groove therein, said fill plunger having a projection for engagement with said stop pin and with the rearward portion of said body, respectively, upon the filling of said syringe; an ejection plunger slidably carried within said bore and within the longitudinal groove of said fill plunger for ejecting material from said syringe; and a fill spring mounted within said bore and at the forward portion of said body for engagement with said body and with said ejection plunger for causing the rearward movement of said fill and ejection plungers when the syringe is being filled.
Claim 3
Dependent Claim
47 words
A syringe as in claim 1 wherein said fill plunger further includes a shoulder portion adjacent to said groove for contacting the rearward portion of said ejection plunger and for enabling the simultaneous forward movement of said ejection plunger with the forward movement of said fill plunger.
Claim 4
Dependent Claim
100 words
A pipetting syringe of precisely variable displacement volume, comprising: a dispenser body with an axial bore therethrough; said body also having a plurality of Holes therein for receiving and holding a removable stop pin in a selected one of said holes; first means at least partially located within said bore for enabling a filling of said syringe to a precisely determined volume; and second means in slidable contact with at least a portion of said first means and at least partially within said bore for ejecting material from said syringe whereby said precise volume of material is substantially completely ejected.
Claim 5
Dependent Claim
100 words
A pipetting syringe of precisely variable displacement volume, comprising: a dispenser body with an axial bore therethrough; said body also having a plurality of Holes therein for receiving and holding a removable stop pin in a selected one of said holes; first means at least partially located within said bore for enabling a filling of said syringe to a precisely determined volume; and second means in slidable contact with at least a portion of said first means and at least partially within said bore for ejecting material from said syringe whereby said precise volume of material is substantially completely ejected.
Claim 6
Dependent Claim
48 words
The syringe of claim 3 wherein said first means includes: a fill plunger having an elongated groove therein and including a projection at the forward end thereof for engagement with said stop pin and with the rearward portion of said body, respectively, upon the filling of said syringe.
Claim 7
Dependent Claim
55 words
The syringe of claim 4 wherein said first means further includes a fill spring mounted within said bore and at the forward portion of said body in engagement with said body and with said second means for causing the rearward movement of said fill plunger and said second means when the syringe is being filled.
Claim 8
Dependent Claim
42 words
The syringe of claim 3 wherein a portion of said first means has a longitudinal groove therein and wherein said second means includes: an ejection plunger slidably located within said bore and within the longitudinal groove for ejecting material from the syringe.
Claim 9
Dependent Claim
40 words
The syringe of claim 6 wherein said second means further includes a dispensable pipette tip removably fastened to the forward end of said ejection plunger whereby succeeding loads of material drawn into the syringe are not contaminated by previous loads.
Claim 10
Dependent Claim
47 words
The syringe of claim 6 wherein said ejection plunger is of such a length as to extend beyond the forwardmost portion of said body when the ejection plunger is pushed forward to eject the material, whereby overtravel of said ejection plunger with respect to said body occurs.
Claim 11
Dependent Claim
123 words
The syringe of claim 6 wherein said ejection plunger includes an enlarged projecting area substantially midway along the length of said ejection plunger; said first means including a fill plunger within said bore and a fill spring mounted within said bore and at the forward end of said body in engagement with said body and with said enlarged projecting area for causing the rearward movement of said ejection plunger; and said enlarged projecting area also being in removable contact with said fill plunger whereby said enlarged projecting area is removed from contact with said fill plunger when said ejection plunger is moved forwardly independently of any movement of said fill plunger to cause the substantially complete ejection of the material from the syringe.
Claim 12
Dependent Claim
75 words
The syringe of claim 6 including a fill plunger located within said bore with a handle portion integral therewith; and wherein said ejection plunger includes a separate handle integral with said ejection plunger; whereby said syringe may be filled by first pushing said fill plunger forward by the handle thereof and whereby said syringe may be substantially completely emptied by later independently pushing said ejection plunger forward by the handle integral with said ejection plunger.
Claim 13
Dependent Claim
47 words
The syringe of claim 6 wherein said ejection plunger is of such a length as to extend beyond the forwardmost portion of said body when the ejection plunger is pushed forward to eject the material, whereby overtravel of said ejection plunger with respect to said body occurs.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |