TREA

for assembling ladders

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  • CPC
  • B21D39/063
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Parent Industries

BPERFORMING OPERATIONS TRANSPORTING B21Mechanical metalworking B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING METAL B21D39/00Application of procedures in order to connect objects or parts

Current Industry

B21D39/063for assembling ladders
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Ladder with anti-deformed side rails
    • Patent number 6,032,759
    • Issue date Mar 7, 2000
    • Dofair Company, Ltd
    • Chin-Wen Yeh
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Hollow section for coupling with other sections
    • Patent number 5,158,389
    • Issue date Oct 27, 1992
    • VAW Aluminium A.G.
    • Werner Osterwald
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Process for formation of high strength aluminum ladder structures
    • Patent number 4,766,664
    • Issue date Aug 30, 1988
    • Alumax Extrusions, Inc.
    • Joseph C. Benedyk
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Method of applying hollow section coupling to other sections
    • Patent number 4,698,896
    • Issue date Oct 13, 1987
    • Vaw Leichtmetall G.m.b.H.
    • Werner Osterwald
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Apparatus and methods for making rail-to-rung joints for ladders an...
    • Patent number 4,656,721
    • Issue date Apr 14, 1987
    • R. D. Werner Co., Inc.
    • Richard L. Werner
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Device for connecting a tube and a sheet metal element
    • Patent number 4,597,687
    • Issue date Jul 1, 1986
    • Francois Colas
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    T-assembly and method of obtaining same
    • Patent number 4,507,844
    • Issue date Apr 2, 1985
    • Renaud; Maurice
    • Maurice Renaud
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Apparatus for ladder constructions
    • Patent number 4,424,623
    • Issue date Jan 10, 1984
    • William Bailey
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Method of assembling ladder construction
    • Patent number 4,406,048
    • Issue date Sep 27, 1983
    • William Bailey
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Coupling of a tube to a ring member
    • Patent number 4,389,134
    • Issue date Jun 21, 1983
    • Cegedur Societe de Transformation de l'Aluminium Pechiney
    • Francois Colas
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Apparatus for assembling ladder-type frames
    • Patent number 4,293,991
    • Issue date Oct 13, 1981
    • William Bailey
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Method of fabricating metal ladder
    • Patent number 4,205,426
    • Issue date Jun 3, 1980
    • Sears, Roebuck and Co.
    • Harold W. Stillman
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3545072
    • Patent number 3,545,072
    • Issue date Dec 8, 1970
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3541658
    • Patent number 3,541,658
    • Issue date Nov 24, 1970
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3484931
    • Patent number 3,484,931
    • Issue date Dec 23, 1969
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3481026
    • Patent number 3,481,026
    • Issue date Dec 2, 1969
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3477120
    • Patent number 3,477,120
    • Issue date Nov 11, 1969
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3455008
    • Patent number 3,455,008
    • Issue date Jul 15, 1969
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    3388454
    • Patent number 3,388,454
    • Issue date Jun 18, 1968
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3327385
    • Patent number 3,327,385
    • Issue date Jun 27, 1967
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3283402
    • Patent number 3,283,402
    • Issue date Nov 8, 1966
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3280454
    • Patent number 3,280,454
    • Issue date Oct 25, 1966
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3279051
    • Patent number 3,279,051
    • Issue date Oct 18, 1966
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3140540
    • Patent number 3,140,540
    • Issue date Jul 14, 1964
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3119435
    • Patent number 3,119,435
    • Issue date Jan 28, 1964
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3039186
    • Patent number 3,039,186
    • Issue date Jun 19, 1962
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    2911018
    • Patent number 2,911,018
    • Issue date Nov 3, 1959
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    2680179
    • Patent number 2,680,179
    • Issue date Jun 1, 1954
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    1954545
    • Patent number 1,954,545
    • Issue date Apr 10, 1934
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    1907910
    • Patent number 1,907,910
    • Issue date May 9, 1933
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...