US3595090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for drawing fluid into, and discharging fluid from, a pipette
Assignee: DRUMMOND INSTR CO
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Filing: 1969-09-17
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Granted: 1971-07-27
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Expires: 1989-09-17
Abstract
Abstract An apparatus for drawing fluid into, and discharging fluid from, a pipette. The apparatus includes a tubular member having caps sealing both ends thereof, a pipette partially inserted into the tubular member through one of the caps and a cylindrical member inserted through the other cap partially into the tubular member. A piston is slidably positioned therein and has a plunger manually operated so as to move the piston longitudinally of the cylindrical member. A squeeze bulb is fitted over a terminal of the tubular member, the squeeze bulb having an aperture through which the cylindrical member extends and complete evacuation of the tube is effected by exerting pressure on the squeeze bulb which forces air into the pipette to expel any fluid remaining therein. The outer periphery of the cylindrical member is slightly spaced from the wall of the cap defining the aperture therein to provide communication between the squeeze bulb and the interior of the tubular member.
Inventors
- 👤 Michael E Drummond
- 👤 John E Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:51
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/022
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
281 words
Apparatus for drawing fluid into, and discharging fluid from, a pipette including: a. a transparent tubular member, b. caps sealing both ends of said tubular member, c. one of said caps having an aperture in communication with said tubular member, d. a pipette partially inserted through the aperture of said one cap into said tubular member, e. a cylindrical member partially inserted into said tubular member through said other cap, f. said cylindrical member being spaced from said tubular member, g. a piston within, and movable longitudinally through, said cylindrical member, h. a plunger one terminal of which is connected to said piston and extending through said cylindrical member, i. the free terminal of said plunger issuing into a finger engaging loop, j. whereby upon placing the outer end of the pipette into a fluid and moving said piston outwardly through said cylindrical member a controlled quantity of fluid is drawn into the pipette and, upon inward movement of the piston, the fluid is expelled from the pipette, and k. a resilient squeeze bulb, l. one terminal of said squeeze bulb being dome shaped and provided with an aperture through which said cylindrical member passes, m. the outer terminal of said squeeze bulb being engaged over a terminal of said tubular member, n. the outer periphery of said cylindrical member being slightly spaced from the wall of said other cap defining the aperture therein, o. whereby upon squeezing of said squeeze bulb air is directed under pressure through the space between the cylindrical member and the other cap aperture, and through the tubular member into the inner end of the pipette for exerting an expelling force on fluid within the pipette.
Claim 2
Dependent Claim
281 words
Apparatus for drawing fluid into, and discharging fluid from, a pipette including: a. a transparent tubular member, b. caps sealing both ends of said tubular member, c. one of said caps having an aperture in communication with said tubular member, d. a pipette partially inserted through the aperture of said one cap into said tubular member, e. a cylindrical member partially inserted into said tubular member through said other cap, f. said cylindrical member being spaced from said tubular member, g. a piston within, and movable longitudinally through, said cylindrical member, h. a plunger one terminal of which is connected to said piston and extending through said cylindrical member, i. the free terminal of said plunger issuing into a finger engaging loop, j. whereby upon placing the outer end of the pipette into a fluid and moving said piston outwardly through said cylindrical member a controlled quantity of fluid is drawn into the pipette and, upon inward movement of the piston, the fluid is expelled from the pipette, and k. a resilient squeeze bulb, l. one terminal of said squeeze bulb being dome shaped and provided with an aperture through which said cylindrical member passes, m. the outer terminal of said squeeze bulb being engaged over a terminal of said tubular member, n. the outer periphery of said cylindrical member being slightly spaced from the wall of said other cap defining the aperture therein, o. whereby upon squeezing of said squeeze bulb air is directed under pressure through the space between the cylindrical member and the other cap aperture, and through the tubular member into the inner end of the pipette for exerting an expelling force on fluid within the pipette.
Claim 3
Dependent Claim
39 words
The apparatus of claim 1 wherein: a. the ratio of the volume of the apparatus including the tubular member and squeeze bulb with respect to the volume of said cylindrical member, is in the range of 15:1 to 5:1.
Claim 4
Dependent Claim
29 words
The apparatus of claim 2, wherein: a. a cylindrical member having a volume of 250 microliters is employed for pipettes in the size range of 50 to 200 microliters.
Claim 5
Dependent Claim
37 words
The apparatus of claim 2, wherein: a. the volume of the tubular member and squeeze bulb is approximately 1500 microliters, and the volume of the small cylindrical member is in the range of 100 to 300 microliters.
Claim 6
Dependent Claim
29 words
The apparatus of claim 4, wherein: a. a cylindrical member having a volume of 150 microliters is employed for pipettes in the size range of 20 to 100 microliters.
Claim 7
Dependent Claim
242 words
Apparatus for drawing fluid into, and discharging fluid from, a pipette including: a. a tubular member, b. caps sealing both ends of said tubular member, c. both of said caps being provided with apertures, d. a pipette inserted through the aperture of one of the said caps partially into said tubular member, e. a cylindrical member inserted through the aperture of said other cap partially into said tubular member, f. a piston slidably positioned in said cylindrical member, g. means connected to said piston for moving the latter within said cylindrical member, h. whereby upon placing the outer end of the pipette into a fluid and moving said piston outwardly through said cylindrical member a controlled quantity of fluid is drawn into the pipette and, upon inward movement of the piston, is expelled from the pipette, and i. a resilient squeeze bulb engaged over a terminal of said tubular member, j. said squeeze bulb being provided with an aperture through which said cylindrical member extends to a point beyond the squeeze bulb, k. the outer periphery of said cylindrical member being slightly spaced from the wall of said other cap defining the aperture therein, l. whereby, upon squeezing of said squeeze bulb, air is directed under pressure through the space between the cylindrical member and the other cap aperture, and through the tubular member into the inner end of the pipette, for exerting an expelling force on the fluid within the pipette.
Claim 8
Dependent Claim
242 words
Apparatus for drawing fluid into, and discharging fluid from, a pipette including: a. a tubular member, b. caps sealing both ends of said tubular member, c. both of said caps being provided with apertures, d. a pipette inserted through the aperture of one of the said caps partially into said tubular member, e. a cylindrical member inserted through the aperture of said other cap partially into said tubular member, f. a piston slidably positioned in said cylindrical member, g. means connected to said piston for moving the latter within said cylindrical member, h. whereby upon placing the outer end of the pipette into a fluid and moving said piston outwardly through said cylindrical member a controlled quantity of fluid is drawn into the pipette and, upon inward movement of the piston, is expelled from the pipette, and i. a resilient squeeze bulb engaged over a terminal of said tubular member, j. said squeeze bulb being provided with an aperture through which said cylindrical member extends to a point beyond the squeeze bulb, k. the outer periphery of said cylindrical member being slightly spaced from the wall of said other cap defining the aperture therein, l. whereby, upon squeezing of said squeeze bulb, air is directed under pressure through the space between the cylindrical member and the other cap aperture, and through the tubular member into the inner end of the pipette, for exerting an expelling force on the fluid within the pipette.
Claim 9
Dependent Claim
39 words
The apparatus of claim 6, wherein: a. the ratio of the volume of the apparatus including the tubular member and squeeze bulb with respect to the volume of said cylindrical member, is in the range of 15:1 to 5:1.
Claim 10
Dependent Claim
37 words
The apparatus of claim 6, wherein: a. the volume of the tubular member and squeeze bulb is approximately 1500 microliters, and the volume of the small cylindrical member is in the range of 100 to 300 microliters.
Claim 11
Dependent Claim
203 words
Apparatus for drawing fluid into, and discharging fluid from, a pipette, including a. a large tubular member, b. cap means sealing both ends of said tubular member, forming an air chamber therebetween, c. said cap means being provided with apertures, d. a pipette inserted through the aperture of one of said cap means partially into the air chamber of said tubular member, e. a small cylindrical member inserted through the aperture of said other cap means partially into the air chamber of said other tubular member, f. a piston within, and movable longitudinally through, said small cylindrical member, g. a plunger, one terminal of which is connected to said piston, for moving the piston through the small cylindrical member, h. a collapsible bulb mounted over one end of said large tubular member, providing a closed chamber, and i. an air passageway in said other cap means connecting the closed chamber of said collapsible bulb with the air chamber of said large tubular member, j. whereby, upon squeezing of said collapsible bulb, air is directed under pressure through the air passageway, and through the tubular member into the inner end of the pipette, for exerting and expelling force on the fluid within the pipette.
Claim 12
Dependent Claim
203 words
Apparatus for drawing fluid into, and discharging fluid from, a pipette, including a. a large tubular member, b. cap means sealing both ends of said tubular member, forming an air chamber therebetween, c. said cap means being provided with apertures, d. a pipette inserted through the aperture of one of said cap means partially into the air chamber of said tubular member, e. a small cylindrical member inserted through the aperture of said other cap means partially into the air chamber of said other tubular member, f. a piston within, and movable longitudinally through, said small cylindrical member, g. a plunger, one terminal of which is connected to said piston, for moving the piston through the small cylindrical member, h. a collapsible bulb mounted over one end of said large tubular member, providing a closed chamber, and i. an air passageway in said other cap means connecting the closed chamber of said collapsible bulb with the air chamber of said large tubular member, j. whereby, upon squeezing of said collapsible bulb, air is directed under pressure through the air passageway, and through the tubular member into the inner end of the pipette, for exerting and expelling force on the fluid within the pipette.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |