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2023
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Invention
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Manhole lock system. A manhole lock system includes a frame positioned over an access opening, a ... |
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|
Invention
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Manhole lock system |
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2022
|
Invention
|
Manhole lock system.
A manhole lock system includes a frame positioned over an access opening, a... |
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2019
|
P/S
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Composite drainage structures, namely, storm manholes; composite covers and frames for manholes |
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2018
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P/S
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Manholes, not of metal; Non-metal covers and frames for manholes |
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2016
|
Invention
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Skirt for forming an access hatch in concrete. A skirt supports an access hatch at a predetermine... |
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Invention
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Skirt for forming an access hatch in concrete. A skirt supports an access hatch at a predet... |
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2014
|
Invention
|
Explosion mitigating vault. A controlled pressure release vault panel assembly is capable of func... |
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Invention
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Manhole cover. A manhole cover assembly configured to behave as a relief valve in an explosion ev... |
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Invention
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Explosion mitigating cover. A manhole cover assembly configured to behave as a relief valve in an... |
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Invention
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Removable fire hydrant nozzle with improved locking structure. A removable hydrant nozzle with a ... |
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2013
|
Invention
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Floating manhole frame assembly.
A manhole frame assembly according to one embodiment of the pre... |
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Invention
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Manhole cover with insert. A manhole cover includes a cover panel formed from a first material, w... |
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Invention
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Security bolt |
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2011
|
P/S
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Metal construction and utility castings, namely, manholes, manhole covers and frames, catch basin... |
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P/S
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Consultation in the field of civil engineering relating to cast-iron and steel products used in p... |
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1982
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P/S
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Metal-Work Castings and Fabrications Used in the Building and Construction Industries-, namely, M... |
