Patent US4593837A successfully refreshed from Google Patents.
US4593837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable volume pipette
Assignee: Clinical Diagnostic Systems Inc
•
Filing: 1985-03-15
•
Granted: 1986-06-10
•
Expires: 2005-03-15
Abstract
Abstract There is disclosed a pipette useful with disposable tips, comprising a plurality of differently-sized pistons and a piston chamber for each piston. Each piston chamber has a vent passageway extending to the exterior surface of the pipette. The pipette is improved in that the mounting means for mounting a disposable tip comprises, not one surface, but a plurality of differently-sized surfaces. Furthermore, the vent passageway for all but the smallest piston chamber exits at a location in between the mounting surface for the tip of that particular piston chamber and the next smaller mounting surface, whereby the larger disposable tips seal over the vent passageways of the smaller disposable tips.
Inventors
- 👤 Raymond F. Jakubowicz
- 👤 Stuart G. MacDonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:23
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/0275
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
In a pipette for dispensing variable volumes and comprising a plurality of piston chambers, a piston constructed to reciprocate within each of said chambers, means for reciprocating said pistons, a passageway extending from each chamber to a next adjacent chamber, a vent passageway extending from each of said chambers to the exterior of the pipette, and mounting means for mounting disposable tips on the pipette; the improvement wherein said mounting means comprises differently-sized mounting surfaces for mounting differently-sized disposable tips, and wherein all but one of said vent passageways exits on the exterior surface of said pipette at a location disposed between the mounting surface corresponding to the piston chamber vented by said each vent passageway, and the next smaller mounting surface, whereby the larger disposable tips enclose the vent passageways of the smaller disposable tips.
Claim 2
Dependent Claim
136 words
In a pipette for dispensing variable volumes and comprising a plurality of piston chambers, a piston constructed to reciprocate within each of said chambers, means for reciprocating said pistons, a passageway extending from each chamber to a next adjacent chamber, a vent passageway extending from each of said chambers to the exterior of the pipette, and mounting means for mounting disposable tips on the pipette; the improvement wherein said mounting means comprises differently-sized mounting surfaces for mounting differently-sized disposable tips, and wherein all but one of said vent passageways exits on the exterior surface of said pipette at a location disposed between the mounting surface corresponding to the piston chamber vented by said each vent passageway, and the next smaller mounting surface, whereby the larger disposable tips enclose the vent passageways of the smaller disposable tips.
Claim 3
Dependent Claim
155 words
In a pipette for dispensing variable volumes and comprising first and second piston chambers, first and second pistons constructed to reciprocate within said chambers, means for reciprocating said pistons, means defining a first passageway extending from said first chamber to said second chamber and a second passageway fluidly connecting said first chamber to the exterior of said pipette to form a vent, and mounting means for mounting dispensing tips on said pipette; the improvement wherein said mounting means comprises first and second differently-sized mounting surfaces for mounting first and second differently-sized disposable tips, such first disposable tips being larger in diameter and in volume than such second disposable tips, said vent exiting on the exterior surface of said pipette at a location disposed in between said first and second mounting surfaces, and said mounting surfaces having diameters that cause said first disposable tips but not said second disposable tips to surround and enclose said vent.
Claim 4
Dependent Claim
155 words
In a pipette for dispensing variable volumes and comprising first and second piston chambers, first and second pistons constructed to reciprocate within said chambers, means for reciprocating said pistons, means defining a first passageway extending from said first chamber to said second chamber and a second passageway fluidly connecting said first chamber to the exterior of said pipette to form a vent, and mounting means for mounting dispensing tips on said pipette; the improvement wherein said mounting means comprises first and second differently-sized mounting surfaces for mounting first and second differently-sized disposable tips, such first disposable tips being larger in diameter and in volume than such second disposable tips, said vent exiting on the exterior surface of said pipette at a location disposed in between said first and second mounting surfaces, and said mounting surfaces having diameters that cause said first disposable tips but not said second disposable tips to surround and enclose said vent.
Claim 5
Dependent Claim
29 words
A pipette as defined in claim 2, wherein said diameters of said second piston and piston chamber are larger than said diameters of said first piston and piston chamber.
Claim 6
Dependent Claim
29 words
A pipette as defined in claim 2, wherein said diameters of said first piston and piston chamber are larger than said diameters of said second piston and piston chamber.
Claim 7
Dependent Claim
16 words
A pipette as defined in claim 1 or 2, wherein said reciprocating means includes a motor.
Claim 8
Dependent Claim
25 words
A pipette as defined in claim 5, and further including means for electronically altering the amount of travel of said pistons provided by said motor.
References Cited (Backward Citations)
US3131868A
Cited
US3640434A
Cited
US3831618A
Cited
US4141250A
Cited
US4304138A
Cited
US4327595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |