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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 |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Jan 02 1996 | ABRAHAMSON, KATHLEEN A | Donaldson Company, Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 007849 | /0950 | |
Jan 02 1996 | BOECKERMANN, THOMAS A | Donaldson Company, Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 007849 | /0950 | |
Jan 02 1996 | ELFSTRAND, JAMES | Donaldson Company, Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 007849 | /0950 | |
Jan 11 1996 | Donaldson Company, Inc. | (assignment on the face of the patent) | / |
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