Stably fastened safety plug

Electrical connectors – With coupling movement-actuating means or retaining means in... – Retaining means

Reexamination Certificate

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Reexamination Certificate



A safety plug includes a pair of prongs each prong having a hook portion formed on an end portion of the prong to be locked or engaged with a fastening loop portion formed in a receptacle when plugged in the receptacle to prevent from unexpected withdrawal of the safety plug from the receptacle for enhancing electrical safety and for maintaining a normal power supply to an electric equipment.

patent: 2447597 (1948-08-01), Reed
patent: 2479234 (1949-08-01), Hammerly et al.
patent: 2850711 (1958-09-01), Terlinde
patent: 3159445 (1964-12-01), Wolk
patent: 5630726 (1997-05-01), Baldwin
patent: 5921799 (1999-07-01), Forrester
patent: 6875040 (2005-04-01), O'Keefe et al.
patent: 2004/0102103 (2004-05-01), Kling et al.
patent: 2004/0235334 (2004-11-01), Kim


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