US PATENT SUBCLASS 228 / 50
SEAM BACKUP MEANS
Current as of: June, 1999
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DEFINITION
Classification: 228/50
(under the class definition) Device comprising a tangible instrumentality having a surface portion designed and intended to engage directly the surface area of the work or material being fused, on the side of the work opposite to the side which receives energy for fusion-bonding, for the purpose of reacting against such energy.
SEE OR SEARCH THIS CLASS, SUBCLASS:
46, for a similar instrumentality (a "chill") provided with means to bring it into engagement with work or product.
SEE OR SEARCH CLASS
219, Electric Heating,
160, for back-up means for an electric welder.
285, Pipe Joints or Couplings, for a backup member that constitutes part of, or remains with, the joint as a coupling.
