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2013
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Invention
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Explosion mitigating cover. A manhole cover assembly (10) configured to behave as a relief valve ... |
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2011
|
Invention
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Manhole cover safety device. A manhole cover assembly includes a frame that includes a central op... |
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P/S
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Metal construction and utility castings, namely, manholes, manhole covers and frames, catch basin... |
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Invention
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Composite compression molded article and method of manufacture. A composite compression molded ar... |
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2008
|
Invention
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Manhole cover hinge assembly. A manhole cover assembly includes a frame defining an access openin... |
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Invention
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Manhole system. A manhole system that includes a manhole cover and a frame with at least one lock... |
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Invention
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Lift-assisted manhole cover.
A lift-assisted manhole cover assembly with a flush surface and ext... |
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2007
|
Invention
|
Swing-out manhole cover. A swing-out manhole cover assembly having at least one ramp to facilitat... |
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Invention
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Dual lifting manhole cover. A one-piece, unitary manhole cover has dual lifting ports that drain ... |
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Invention
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Municipal casting frame and method of manufacturing same. A municipal casting frame with cast nut... |
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2006
|
Invention
|
Lift-assisted manhole cover. A lift-assisted manhole cover assembly with a flush surface and exte... |
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Invention
|
Municipal casting frame and method of manufacturing same. A municipal casting frame is provided w... |
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Invention
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Detectable warning plate.
A detectable warning plate having integrally cast lugs. The lugs may e... |
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Invention
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Municipal casting portion |
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2005
|
Invention
|
Weld-free connectors for structural elements.
Weld-free connections and connectors and methods o... |
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Invention
|
Cast hatch with lift assist.
A cast hatch having a frame, a hinged cover and a lift assist mecha... |
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2004
|
Invention
|
Fire hydrant valve seat flange. A fire hydrant having a valve seat flange with an integral liner.... |
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Invention
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Grate |
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2003
|
Invention
|
Tree grate |
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Invention
|
Tree grate portion |
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2002
|
Invention
|
Safety hatch for preventing fall-through and unauthorized entry. An access hatch having a frame c... |
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1999
|
Invention
|
Safety hatch for preventing fall-through and unauthorized entry. An access hatch comprises a fram... |
|
1997
|
P/S
|
Rubber gaskets for sealing against water infiltration, leveling adjacent surfaces and protecting ... |
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Invention
|
Parabolic cover for manhole. A manhole cover of substantially monolithic construction is claimed.... |
