Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Reexamination Certificate
2008-01-15
2008-01-15
Ludlow, Jan M. (Department: 1743)
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
C422S105000
Reexamination Certificate
active
10278270
ABSTRACT:
An apparatus and method of manufacture for a pipette tip having a membrane filter includes a pipette tip having an interior annulus for receiving an exterior perimeter of the membrane filter. A shear plate overlying the pipette tip defines an aperture having a dimension equal to the exterior perimeter of the membrane filter. A cylindrical punch has a path of motion for passing through the aperture in the shear plate to the interior annulus of the pipette tip. Membrane filter material is placed over the shear plate in the path of motion of the cylindrical punch. By the expedient of moving the cylindrical punch through the membrane filter material, the aperture in the shear plate, to the interior annulus of the pipette tip to place sheared filter material over the annulus of the pipette tip. Specific embodiments of pipette tips are illustrated including tips having a first filter for filtering material drawn into the pipette tip and second filters from preventing contamination of the pipette.
REFERENCES:
patent: 3985032 (1976-10-01), Avakian
patent: 4022576 (1977-05-01), Parker
patent: 4267729 (1981-05-01), Eddelman
patent: 4973450 (1990-11-01), Schluter
patent: 4999164 (1991-03-01), Puchinger et al.
patent: 5496523 (1996-03-01), Gazit
patent: 5556598 (1996-09-01), Raybuck et al.
patent: 5580529 (1996-12-01), DeVaughn et al.
patent: 5648266 (1997-07-01), Astle
patent: 5697522 (1997-12-01), Mayes
patent: 5833927 (1998-11-01), Raybuck et al.
patent: 5876918 (1999-03-01), Wainwright et al.
patent: 10-288571 (1998-10-01), None
patent: WO 95/27797 (1995-10-01), None
Anonymous, “Pipette tip which aspirates without filtering and filters dispensed liquid,”Research Disclosure(Emsworth, GB), Sep. 1993, pp. 586-593.
LandOfFree
Membrane filtered pipette tip does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Membrane filtered pipette tip, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Membrane filtered pipette tip will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3944609