US3574334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dilutor pipette
Assignee: Oxford Laboratories Inc
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Filing: 1969-02-10
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Granted: 1971-04-13
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Expires: 1989-02-10
Abstract
Abstract A dilutor pipette for accurately dispensing a precise amount of sample material together with a variable selected precise quantity of diluent is described having a diluent container, measuring and dispensing mechanism and a sample syringe barrel connected to said diluent dispensing mechanism with diluent and sample barrels provided with annular sharp transverse edges.
Inventors
- 👤 William J Roach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:27
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/38; B; B01; B01L; B01L3/00; B01L3/02; B01L3/0282
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
242 words
A dilutor pipette adapted to repeatedly dispense a constant volume of sample solution and a preselected volume of diluent therefor, comprising a diluent container having a cover, a diluent barrel within said container supported at its upper end by said cover, a diluent plunger having an operating handle exterior of said cover, a scale post cooperating with said operating handle to preselect a desired volume of diluent, said diluent plunger extending downwardly through said cover and within said barrel, a tubular member within said container, a connection between the lower end portion of said barrel and said tubular member, said latter mEmber having valves below and above said connection within said container and having its upper end portion extending outwardly of said cover, a sample syringe barrel coupled at its lower end to the upper end portion of said tubular member and having a transverse output stem, a delivery tip coupled to said output stem, a sample plunger extending downwardly into said sample syringe barrel to a point adjacent said output stem, a sample knob, and a connection including a threaded structure between said sample knob and said sample plunger, the turning of said sample knob through a definite angle serving to cause said threaded structure to move said plunger to aspirate a predetermined quantity of sample from a container into said delivery tip, and depressing said diluent operating handle thereafter serving to dispense the sample and the preselected volume of diluent.
Claim 2
Dependent Claim
242 words
A dilutor pipette adapted to repeatedly dispense a constant volume of sample solution and a preselected volume of diluent therefor, comprising a diluent container having a cover, a diluent barrel within said container supported at its upper end by said cover, a diluent plunger having an operating handle exterior of said cover, a scale post cooperating with said operating handle to preselect a desired volume of diluent, said diluent plunger extending downwardly through said cover and within said barrel, a tubular member within said container, a connection between the lower end portion of said barrel and said tubular member, said latter mEmber having valves below and above said connection within said container and having its upper end portion extending outwardly of said cover, a sample syringe barrel coupled at its lower end to the upper end portion of said tubular member and having a transverse output stem, a delivery tip coupled to said output stem, a sample plunger extending downwardly into said sample syringe barrel to a point adjacent said output stem, a sample knob, and a connection including a threaded structure between said sample knob and said sample plunger, the turning of said sample knob through a definite angle serving to cause said threaded structure to move said plunger to aspirate a predetermined quantity of sample from a container into said delivery tip, and depressing said diluent operating handle thereafter serving to dispense the sample and the preselected volume of diluent.
Claim 3
Dependent Claim
79 words
A dilutor pipette as defined in claim 1 wherein said threaded structure comprises a threaded shaft coupled to said sample knob, a spherical nut threaded on said shaft below said knob, a hollow spherical bearing means supporting said nut, said threaded shaft having its lower end coupled to said sample plunger for actuating the latter, said bearing means allowing automatic alignment of said sample plunger and sample syringe barrel to facilitate easy operation of said sample knob in use.
Claim 4
Dependent Claim
107 words
A dilutor pipette as defined in claim 2 wherein said diluent barrel and said sample syringe barrel are open at their upper ends for receiving said diluent plunger and said sample plunger respectively, said barrels and their cooperating plungers being of uniform diameters throughout their lengths, whereby there are no pockets in the opposing surfaces of said barrels and their plungers to accumulate harmful deposited material resulting from evaporation of liquid from the surfaces of said plungers, said barrels providing annular sharp transverse upper edges for scraping off any such material lodged on said plungers in use each time the plungers are moved downwardly into their barrels.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |