US3567398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-automatic pipetting and diluter device
Assignee: Farr Devices Inc
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Filing: 1968-10-23
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Granted: 1971-03-02
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Expires: 1988-10-23
Abstract
Abstract A LABORATORY APPARATUS FOR SEMI-AUTOMATICALLY ACCURATELY MEASURING OUT A VOLUME OF DILUTING REAGENT AND ALSO ACCURATELY MEASURING OUT A VOLUME OF A LIQUID SAMPLE FOR ANALYSIS, AND FOR DISCHARGING BOTH LIQUIDS INTO A REACTION VESSEL, WITH PRE-SET OR ADJUSTABLE VOLUMES FOR BOTH LIQUIDS. THE OPERATION IS EFFECTED BY MEANS OF A SMALL MOTOR DRIVEN AIR PUMP WHICH PROVIDES AIR AT INCREASED OR REDUCED PRESSURES AS REQUIRED, AND AN AIR-PERMEABLE BUT HYDROPHOBIC POROUS MEMBRANE SERVES TO FIX THE LIQUID LEVEL IN THE MEASURING PIPETTE. D R A W I N G
Inventors
- 👤 Andrew F Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:05
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/38; B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |