Road structure – process – or apparatus – Pavement – Vault cover-closure
Reexamination Certificate
2007-04-10
2007-04-10
Addie, Raymond W. (Department: 3671)
Road structure, process, or apparatus
Pavement
Vault cover-closure
C052S019000
Reexamination Certificate
active
10780780
ABSTRACT:
A conventional sewer grate has a locking mechanism for preventing removal of the grate from its mounting frame by unauthorized persons. The locking mechanism includes a grate hold-down device, a threaded nut attached to the mounting frame below the hold-down device, and a bolt extending downwardly through the hold-down device into threaded engagement with the nut. The head of the bolt is specially constructed so that a specially-formed wrench is required to unscrew the bolt from the nut.
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Addie Raymond W.
Grate Sewer Lock Co., LLC
Weide & Miller Ltd.
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