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Individual
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Individual
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Priority to ES75106UpriorityCriticalpatent/ES75106Y/en
Publication of ES75106UpublicationCriticalpatent/ES75106U/en
Application grantedgrantedCritical
Publication of ES75106YpublicationCriticalpatent/ES75106Y/en
Improved paper sack, characterized in that its walls are formed by two, three or more superimposed sheets of paper, each of whose leaves is provided, in all its surface, a series of more or less regular undulations, achieved by adequate means , said corrugated sheets being assembled by means of an appropriate adhesive that is applied only on the ridge backs of the outer sheets, so that the intermediate sheet is glued to the other two adjacent precisely by the ridges or ridges of its corrugations, which results in a series of air chambers that give the whole a certain elasticity, cushioning, flexibility and resistance. (Machine-translation by Google Translate, not legally binding)
ES75106U1959-07-221959-07-22
Perfected paper sack
ExpiredES75106Y
(en)
An apparatus and procedure for obtaining flexible and extensible corrugated paper up to a limited extension (Machine-translation by Google Translate, not legally binding)