Ladder locking mechanism

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4574918
SERIAL NO

06600804

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A portable folding ladder comprising a plurality of U-shaped modules having a rung and two vertical portions, the modules movable connected to each other, and when opened becoming progressible narrower as they approach the top of the ladder, when folded the narrower modules fitting inside of the next wider modules and locking means to lock the modules in a rigid manner which when the ladder is extended and open.

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Patent Owner(s)

Patent OwnerAddress
ANDRAL CORPORATION5792 MAIN ST WILLIAMSVILLA NY 14221

International Classification(s)

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  • 1984 Application Filing Year
  • E06C Class
  • 36 Applications Filed
  • 0 Patents Issued To-Date
  • 0 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances19840255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Marques, Salvador A Barcelona, ES 2 45

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  • 28 Citation Count
  • E06C Class
  • 0 % this patent is cited more than
  • 39 Age
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