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Patent
   D428128
Priority
Apr 26 1996
Filed
Apr 30 1998
Issued
Jul 11 2000
Expiry
Jul 11 2014
Inventors
Gillingham…
Assg.orig
Donaldson …
Assg.curr
Donaldson …
Entity
unknown
Referenced by
118
References
24
Maint.:
n/a
The ornamental design for a conical filter, as shown and described.

FIG. 1 shows a perspective view of a conical filter showing our new design;

FIG. 2 shows a side elevational view thereof, the other sides being indentical to that shown;

FIG. 3 shows a top plan view thereof; and,

FIG. 4 shows a bottom plan view thereof.
INVENTORS:

Gillingham, Gary R., Wagner, Wayne M., Risch, Daniel T., Tokar, Joseph C., Rothman, Jim C., Carter, Steven A.

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ASSIGNMENT RECORDS    Assignment records on the USPTO
///////
Executed onAssignorAssigneeConveyanceFrameReelDoc
Apr 30 1998Donaldson Company, Inc.(assignment on the face of the patent)
Oct 27 1998GILLINGHAM, GARY R Donaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0110470850 pdf
Oct 29 1998WAGNER, WAYNE M Donaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0110470850 pdf
Nov 05 1998TOKAR, JOSEPH C Donaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0110470850 pdf
Nov 06 1998RISCH, DANIEL T Donaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0110470850 pdf
Nov 06 1998ROTHMAN, JIM C Donaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0110470850 pdf
Nov 06 1998CARTER, STEVEN A Donaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0110470850 pdf
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