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The ornamental design for a portable door knob alarm, as shown and described. |
FIG. 1 is a perspective view of a portable door knob alarm showing my new design, with the broken lines showing for illustrative purposes only and forming no part of the claimed design;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a top plan view thereof.
Patent | Priority | Assignee | Title |
6154130, | Dec 09 1997 | Portable room security system | |
8912903, | Nov 06 2012 | Door knob security alarm | |
D430500, | Dec 13 1999 | Door alarm |
Patent | Priority | Assignee | Title |
D305508, | Jul 15 1986 | Audible window and door intrusion alarm | |
D311349, | Jul 21 1988 | W W B A INCORPORATED | Combined personal alarm and key ring |
D336054, | Dec 13 1991 | Burglar alarm | |
D337960, | Jan 29 1991 | John Manufacturing Limited | Portable burglar alarm |
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