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3021900
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Information
Patent Grant
3021900
References
Source
Patent Number
3,021,900
Date Filed
Not available
Date Issued
Tuesday, February 20, 1962
62 years ago
CPC
B29C33/505 - cores or mandrels
B28B21/205 - having a rigid frame inside the inflatable part of the core
B29C49/44 - for applying pressure through the walls of an inflated bag
B29C43/12 - using bags surrounding the moulding material or using membranes contacting the moulding material
US Classifications
162 - Paper making and fiber liberation
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