Lockable manhole cover

Details Lockable manhole cover Lockable manhole cover

2007-01-09

2007-01-09

Hartmann, Gary S (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

Reexamination Certificate

active

11103876

ABSTRACT:
A manhole system including a cover, a frame receiving the cover and at least one security device securing the cover to the frame.

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patent: 6752565 (2004-06-01), Schrage
patent: 6769834 (2004-08-01), Stange
patent: 6886577 (2005-05-01), Phillips et al.

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