US Patent 7530767 Trench box safety ladder
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Patent abstract
Various embodiments of the present invention relate to trench box safety ladders and methods of constructing trench boxes with safety ladders. In one embodiment, a trench box comprises two side walls with a plurality of supports between the two walls, a built-in ladder within the inner face of a side wall, and an extension ladder positioned on the top face of the side wall.
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US Patent 07530767 Trench box safety ladder US Patent 7530767 Trench box safety ladder
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Patent Number
0753076700
Patent Number
753076700
Edits on 25 Mar, 2023
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Patent Jurisdiction
Patent Number
075307670
Date of Patent
May 12, 2009
0Patent Application Number
118336640
Date Filed
August 3, 2007
0Official Website
Patent Primary Examiner
Edits on 23 Sep, 2022
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Infobox
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Patent Jurisdiction
Patent Number
075307670
Date of Patent
May 12, 2009
0Patent Application Number
118336640
Date Filed
August 3, 2007
0Official Website
Patent Primary Examiner
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US Patent 07530767 Trench box safety ladder
Infobox
Is a
Patent jurisdiction
Patent number
07530767
Date of patent
May 12, 2009
Patent application number
11833664
Date Filed
August 3, 2007
Patent primary examiner
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