US4059020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for micropipettes
Assignee: Centaur Chemical Co
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Filing: 1976-09-09
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Granted: 1977-11-22
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Expires: 1996-09-09
Abstract
Abstract A disposable two part filter assembly for use on the detachable tip of a laboratory pipette. It comprises a body member with an opening shaped and sized to engage the tip. Such body members may be provided for a wide range of tip sizes and shapes. Inserted within each of the body members is a filter element. The filter elements have essentially the same size and shape but may differ as to material and porosity.
Inventors
- 👤 Souren Avakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:09
CPC Classifications
B; B01; B01D; B01D35/00; B01L; B01L3/00; B01L3/02; B01L3/0275; G; G01; G01N; G01N35/00; G01N35/10; G01N35/1009; G01N35/1016; G01N2035/102; G01N2035/1023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
Filter apparatus for use with a liquid sampling pipette having a detachable tip member in the form of a truncated hollow cone defining an axial reservoir therethrough and an opening defined by the truncated tip and communicating with the reservoir to receive a liquid sample therethrough which comprises: a liquid impervious body member defining a liquid passage therethrough, said passage being dimensioned to frictionally solely by friction engage said tip; and a porous filter plug retained by said body member in alignment with said liquid passage.
Claim 2
Dependent Claim
86 words
Filter apparatus for use with a liquid sampling pipette having a detachable tip member in the form of a truncated hollow cone defining an axial reservoir therethrough and an opening defined by the truncated tip and communicating with the reservoir to receive a liquid sample therethrough which comprises: a liquid impervious body member defining a liquid passage therethrough, said passage being dimensioned to frictionally solely by friction engage said tip; and a porous filter plug retained by said body member in alignment with said liquid passage.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein said passage includes a recessed portion enclosing said filter plug.
Claim 4
Dependent Claim
16 words
The apparatus of claim 2 wherein said recessed portion and said filter plug are substantially cylindrical.
Claim 5
Dependent Claim
12 words
The apparatus of claim 1 wherein said filter plug is porous plastic.
Claim 6
Dependent Claim
12 words
The apparatus of claim 1 wherein said filter plug is porous metal.
References Cited (Backward Citations)
US3449081A
Cited
US3985032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |