Dispensing – With filter – Internally extended outlet pipe
Reexamination Certificate
2000-03-03
2001-05-08
Huson, Gregory L. (Department: 3754)
Dispensing
With filter
Internally extended outlet pipe
C222S464100, C222S383100, C222S382000
Reexamination Certificate
active
06227412
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to a filter mounted at the distal end of a dip tube of a manually actuated dispenser, and more particularly to such a filter as having a perforate area greater than the outer diameter of the dip tube to which the filter is attached to thereby avoid filter clogging and to minimize flow resistance of liquid product into the dip tube during pumping operation.
Known prior art dip tube filters, of one-piece or multiple part construction, typically include a mesh screen or the like having its perforate area confined within the interior diameter of the dip tube which thereby reduces the available mesh area for functioning as a filter. Moreover product flow into the dip tube is limited to that area immediately adjacent the end of the dip tube.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to improve upon the prior art dip tube filters by the provision of a one-piece, non-hinged dip tube filter having an open mesh area greater than the inner area of the dip tube to thereby improve upon the filtering function. The filter comprises an open tubular member having a perforate bottom wall, the dip tube to which the filter is attached being spaced inwardly of the inner wall of the tubular member by the provision of spacers. A greater open mesh area is therefore provided in which a portion of the perforated area lies in alignment with the inner diameter of the dip tube while another portion lies outside that inner diameter area. Moreover the spacers for the dip tube can provide for filtering of product along the length of the tubular filter from its open end into the distal end of the dip tube.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: D. 240036 (1976-05-01), Tada
patent: 3804258 (1974-04-01), Okuniewski et al.
patent: 4107043 (1978-08-01), McKinney
patent: 5154317 (1992-10-01), Roppolo, III
patent: 5154320 (1992-10-01), Bolduc
patent: 5240151 (1993-08-01), Worm
patent: 5376272 (1994-12-01), Spearman
patent: 5497945 (1996-03-01), Steinberg et al.
Dykema Gossett PLLC
Huson Gregory L.
Nicolas Frederick C
Saint-Gobain Calmar Inc.
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