Patent
   D378744
Priority
Jan 11 1996
Filed
Jan 11 1996
Issued
Apr 08 1997
Expiry
Apr 08 2011
Assg.orig
Entity
unknown
4
5
n/a
The ornamental design for restriction indicator, as shown and described.

FIG. 1 is a perspective view of a restriction indicator according to the present invention;

FIG. 2 is a top plan view of the restriction indicator shown in FIG. 1;

FIG. 3 is a side elevational view of the restriction indicator shown in FIG. 1; and,

FIG. 4 is a bottom plan view of the restriction indicator shown in FIG. 1.

Abrahamson, Kathleen A., Boeckemann, Thomas A., Efstrand, James

Patent Priority Assignee Title
D551943, Feb 28 2006 Gates Corporation Dual-mass damper
D671201, Jun 15 2010 Nitto Denko Corporation Vent filter
D672447, Jun 15 2010 Nitto Denko Corporation Vent cap
D672857, Jun 15 2010 Nitto Denko Corporation Vent cap
Patent Priority Assignee Title
3939457, Nov 07 1974 Air filter restriction indicating device
4020783, Jun 19 1975 Donaldson Company, Inc. Air cleaner with restriction indicator
4031847, Apr 21 1976 Donaldson Company, Inc. Pressure ratio reversal indicator
4254731, May 24 1978 Engineering Components Limited Filter restriction indicator
4445456, Jun 19 1978 EPCI ACQUISITION CORP Air filter restriction indicating device
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Jan 02 1996ABRAHAMSON, KATHLEEN A Donaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0078490950 pdf
Jan 02 1996BOECKERMANN, THOMAS A Donaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0078490950 pdf
Jan 02 1996ELFSTRAND, JAMESDonaldson Company, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0078490950 pdf
Jan 11 1996Donaldson Company, Inc.(assignment on the face of the patent)
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