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Patent
   D251183
Priority
Apr 08 1977
Filed
Apr 08 1977
Issued
Feb 27 1979
Expiry
Feb 27 1993
Inventors
Howard, Ja…
Assg.orig
Earl Coope…
Assg.curr
Earl Coope…
Entity
unknown
Referenced by
5
References
5
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:
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11398707, Jul 10 2020 Fluke Corporation Calibrator lead set for automated calibration
7064554, Oct 07 2004 Fluorescent light bulb test apparatus and method of use
7102344, May 27 2005 Circuit tester
D352009, Aug 27 1990 Circuit analyzer
D505087, Aug 25 2004 Power Measurement Ltd. Energy monitoring device
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2460830,
2771580,
3818325,
3875510,
236594,
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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