Patent US5068597A successfully refreshed from Google Patents.
US3855868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple pipette
Assignee: Thermo Fisher Scientific Oy
•
Filing: 1973-01-30
•
Granted: 1974-12-24
•
Expires: 1993-01-30
Abstract
Abstract A multiple pipette has inside its body a piston mover rod which is provided with a push button at its upper end and surrounded by a spiral spring. Once the rod has been pressed downwardly, the spring returns the rod to its original position so that liquid is sucked into containers connected with the lower ends of the cylinders and provided with points. The rod can be pressed down again against the spring force for discharging the liquid from the containers.
Inventors
- 👤 O Sudvaniemi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:46
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/0224; G; G01; G01N; G01N35/00; G01N35/10; G01N35/1065
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A multiple pipette comprising a body, a piston rod disposed within the body, a push button attached to one end of the piston rod, a plurality of containers for holding liquid, a plurality of cylinders connected to the containers, a plurality of pistons within the cylinders, a plurality of O-rings surrounding the pistons, spiral spring means surrounding the piston rod for returning it to a position in which the containers are filed after the push button has been pressed, and connecting means for connecting the pistons to the cylinders while permitting sideways movement of the pistons, the connecting means including connecting spring means that restrains axial movement of the pistons in relation to the piston rod, said connecting spring means having a force that exceeds the friction force of the Orings.
Claim 2
Dependent Claim
131 words
A multiple pipette comprising a body, a piston rod disposed within the body, a push button attached to one end of the piston rod, a plurality of containers for holding liquid, a plurality of cylinders connected to the containers, a plurality of pistons within the cylinders, a plurality of O-rings surrounding the pistons, spiral spring means surrounding the piston rod for returning it to a position in which the containers are filed after the push button has been pressed, and connecting means for connecting the pistons to the cylinders while permitting sideways movement of the pistons, the connecting means including connecting spring means that restrains axial movement of the pistons in relation to the piston rod, said connecting spring means having a force that exceeds the friction force of the Orings.
Claim 3
Dependent Claim
37 words
The apparatus of claim 1, further comprising an O-ring stay for positioning the O-rings, a plurality of springs for positioning the O-ring stay, and a plurality of bolts for adjusting the force of the O-ring positioning springs.
Claim 4
Dependent Claim
41 words
The apparatus of claim 1, further comprising a joiner member by which the containers are interconnected and means for guiding and positioning the containers, said guiding means including sleeve-like extensions attached to the containers and air tight seals contacting the extensions.
Claim 5
Dependent Claim
45 words
The apparatus of claim 1, further comprising setting means for adjusting the stroke of the pistons, said setting means including a rotatable setting sleeve, a scale for indicating the adjustment of the setting means and a transparent ring through which the scale can be read.
Claim 6
Dependent Claim
18 words
The apparatus of claim 4, further comprising locking sleeve means for locking the position of the setting spring.
Claim 7
Dependent Claim
25 words
The apparatus of claim 4, further comprising a micrometer scale and calibrating means cooperating with the micrometer scale for changing the volume of each container.
References Cited (Backward Citations)
US3498342A
Cited
US3718439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |