Patent US3649218A successfully refreshed from Google Patents.
US3649218A
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Method for preparing metered liquid sample dilutions
Assignee: Coulter Electronics Inc
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Filing: 1969-05-07
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Granted: 1972-03-14
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Expires: 1989-05-07
Abstract
Abstract Disclosed is a diluting method and apparatus which pumps a metered volume of a diluent into a conduit system, one portion of which includes a metered capillary tube bypass, into which is separately drawn concentrate. Once the system portions are filled with diluent and concentrate, a metered pumping of diluent forces diluent through the capillary bypass and forces the concentrate to mix with the diluent. The volume of mixed dilution thereby forced from the system equals the volume of the metered diluent. The structural arrangement includes valves which coact to obviate the need for between dilution rinsing of the system.
Inventors
- 👤 Jacques A Pontigny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:16
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/38; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A method according to claim 1 in which aspirating is employed in said step of filling the second conduit.
Claim 2
Dependent Claim
22 words
A method according to claim 1 in which cyclic pumping is employed in said step of forcing the metered volume of diluent.
Claim 3
Dependent Claim
15 words
A method according to claim 1 in which said first conduit comprises a tubular element.
Claim 4
Dependent Claim
41 words
A method according to claim 4 in which constricting the first tubular element just downstream of the entrance to the bypass is employed in said step of diverting and causing a portion of the liquid diluent to pass through the bypass.
References Cited (Backward Citations)
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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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |