US3754687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A multi-positional pipetting dispenser
Assignee: Kontes Glass Co
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Filing: 1971-09-21
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Granted: 1973-08-28
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Expires: 1991-09-21
Abstract
Abstract A pipetting dispenser of the piston-cylinder type with interchangeable fittings by which the operative movement of the piston may be arranged to be in line with or at an angle to the axis of an attached pipette and having adjustable stop means to limit travel of the piston within predetermined limits, together with means automatically retracting the piston from its discharge position to a position in engagement with said adjustable stop means, thereby insuring the repeated dispensing of like volumes of liquid from said pipette in successive operations of the dispenser, for any adjusted position of the stop means.
Inventors
- 👤 R Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:00
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/0224; G; G01; G01F; G01F11/00; G01F11/02; G01F11/04; G01F11/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A pipetting dispenser comprising a body member having a cavity therein, a plunger mounted within said cavity for reciprocation therein, means defining fluid inlet and discharge passage means in said body member in communication with said cavity, means for reciprocating said plunger within said cavity to draw fluid into said cavity by movement thereof in one direction and to discharge fluid from said cavity by movement in the opposite direction adjustable stop means for variably limiting the plunger stroke in one direction and fixed stop means limiting the plunger stroke in the opposite direction means to support a pipette in operative fluid communication with said cavity in said body member, said pipette-supporting means including a body-member-attachment fitting having communicating fluid bores therein, each bore having fluid communication at one end with a pipette supported in said pipette surrpot, each of said bores opening at their opposite ends out through distinct and spaced-apart wall portions of said body member, said body member having mounting means operatively and selectively connectable to either one or the other of said bore openings, and a closure plug for closing the other of said bore openings not connected to said mounting means.
Claim 2
Dependent Claim
196 words
A pipetting dispenser comprising a body member having a cavity therein, a plunger mounted within said cavity for reciprocation therein, means defining fluid inlet and discharge passage means in said body member in communication with said cavity, means for reciprocating said plunger within said cavity to draw fluid into said cavity by movement thereof in one direction and to discharge fluid from said cavity by movement in the opposite direction adjustable stop means for variably limiting the plunger stroke in one direction and fixed stop means limiting the plunger stroke in the opposite direction means to support a pipette in operative fluid communication with said cavity in said body member, said pipette-supporting means including a body-member-attachment fitting having communicating fluid bores therein, each bore having fluid communication at one end with a pipette supported in said pipette surrpot, each of said bores opening at their opposite ends out through distinct and spaced-apart wall portions of said body member, said body member having mounting means operatively and selectively connectable to either one or the other of said bore openings, and a closure plug for closing the other of said bore openings not connected to said mounting means.
Claim 3
Dependent Claim
49 words
The apparatus as described in claim 1 wherein both the fixed stop means and said adjustable stop means are disposed within the cavity in said body member, and wherein means are provided for resiliently biasing said plunger to a normally retracted position in engagement with said adjustable stop means.
Claim 4
Dependent Claim
46 words
The apparatus as described in claim 1 wherein said adjustable stop means comprises a sleeve threadedly mounted in the wall of said cavity in coaxial relation thereto and provided with a stop shoulder adjustably positionable within said cavity in the path of movement of said plunger.
Claim 5
Dependent Claim
30 words
The apparatus described in claim 3 wherein a threaded jam nut is provided and engaged with said sleeve to lock the sleeve in an adjusted position within said body member.
Claim 6
Dependent Claim
62 words
The apparatus as described in claim 1 wherein said pipette supporting means includes a theaded terminal portion on said body-member-attachment fitting provided with a recess dimensioned to receive an end portion of a pipette, and a screw-threaded packing gland engaged with said terminal portion for compressing a packing material within said gland into sealing engagement with a pipette fitted into said recess.
Claim 7
Dependent Claim
30 words
The apparatus as described in claim 1 wherein calibrated indicia are provided on said dispenser to indicate the effective volume of the cavity as defined by said adjustable stop means.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |