Key operated padlock construction with visual indicator

Details Key operated padlock construction with visual indicator Key operated padlock construction with visual indicator

2006-04-17

2008-12-23

Engle, Patricia L (Department: 3673)

Locks

Portable

Padlocks

C070S035000, C070S337000, C070S432000, C070S441000

Reexamination Certificate

active

07467531

ABSTRACT:
By providing an automatically activated positive indicator or signal which is responsive to only the use of a master key, a padlock construction is achieved which is highly effective for providing notice to the user whenever the padlock has been opened by said master key. In accordance with the present invention, the positive indicator or signal is constructed for being automatically activated whenever the master key is employed, with said indicator or signal being locked in its activated position, and capable of being re-set by only the user.

REFERENCES:
patent: 1757020 (1930-05-01), Ramey
patent: 2048570 (1936-07-01), Slaymaker
patent: 2048571 (1936-07-01), Slaymaker
patent: 2163311 (1939-06-01), Raymond
patent: 2834195 (1958-05-01), Stackhouse
patent: 3221526 (1965-12-01), Stackhouse
patent: 3824819 (1974-07-01), Neary
patent: 6047577 (2000-04-01), Klimas
patent: 6516643 (2003-02-01), Olshausen
patent: 6860131 (2005-03-01), Armstrong et al.
patent: 6877345 (2005-04-01), Misner et al.
patent: 7216517 (2007-05-01), Ling et al.

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