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Patent
   D251484
Priority
Apr 08 1977
Filed
Apr 08 1977
Issued
Apr 03 1979
Expiry
Apr 03 1993
Inventors
Howard, Ja…
Assg.orig
Earl Coope…
Assg.curr
Earl Coope…
Entity
unknown
Referenced by
4
References
7
Maint.:
n/a
The ornamental design for electrical testing instrument, substantially as shown.

FIG. 1 is a front perspective view of an electrical testing instrument showing my new design; and

FIG. 2 is a rear perspective view thereof.
INVENTORS:

Howard, James L.

THIS PATENT IS REFERENCED BY THESE PATENTS:
Patent Priority Assignee Title
D254657, Nov 17 1977 Digital counter readout
D275086, Jun 17 1982 PCF Group Inc. Volt meter
D362197, Mar 30 1994 DX Antenna Co., Ltd. Apparatus for measuring electric field strength
D505087, Aug 25 2004 Power Measurement Ltd. Energy monitoring device
THIS PATENT REFERENCES THESE PATENTS:
Patent Priority Assignee Title
1779946,
1965837,
2609409,
2771580,
3646579,
3893028,
4041380, Mar 12 1976 KASTAR, INC , A CORP OF WISCONSIN Multi-function tester with removable circuit cartridge
ASSIGNMENT RECORDS    Assignment records on the USPTO
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Apr 08 1977Earl Cooper, Phifer(assignment on the face of the patent)
MAINTENANCE FEES AND DATES:    Maintenance records on the USPTO
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