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B21D39/063
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Parent Industries
B
PERFORMING OPERATIONS TRANSPORTING
B21
Mechanical metalworking
B21D
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING METAL
B21D39/00
Application of procedures in order to connect objects or parts
Current Industry
B21D39/063
for assembling ladders
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Patents Grants
last 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...
Patents Applications
last 30 patents