| DE901624C
              (de)
            
            * | 1941-08-13 | 1954-01-14 | Ernst Klein | Ventilsack aus Papier | 
        
          | US2778173A
              (en)
            
            * | 1950-11-29 | 1957-01-22 | Wilts United Dairies Ltd | Method of producing airtight packages | 
        
          | DE953235C
              (de)
            
            * | 1951-09-13 | 1956-11-29 | Arno Andreas | Verfahren und Vorrichtung zum Verpacken und Verschicken von Massenguetern wie Zement, Kalk, Gips u. ae. | 
        
          | DE1012160B
              (de)
            
            * | 1952-12-17 | 1957-07-11 | Bischof & Klein Papierverarbei | Kreuzbodenventilsack oder Kreuzbodenventilbeutel aus Papier oder aus einem aehnlichen Werkstoff | 
        
          | DE1085027B
              (de)
            
            * | 1958-04-16 | 1960-07-07 | Bischof & Klein Papierverarbei | Ventilsack aus Papier oder aus einem aehnlichen Werkstoff | 
        
          | DE1212858B
              (de)
            
            * | 1958-12-24 | 1966-03-17 | Papierwerk Haemmern G M B H & | Ventilsack | 
        
          | DE1210731B
              (de)
            
            * | 1960-07-08 | 1966-02-10 | Du Pont Canada | Beutelartige Verpackung aus Kunststoff | 
        
          | DE1212857B
              (de)
            
            * | 1962-04-25 | 1966-03-17 | Olin Mathieson | Ventilsack zur Aufnahme und Verpackung von schuettbarem Gut | 
        
          | DE1245697B
              (de)
            
            * | 1962-04-30 | 1967-07-27 | Windmoeller & Hoelscher | Vorrichtung zum Einlegen eines Ventilblattes in einen offenen Kreuzboden von Kreuzboden-Ventilsaecken | 
        
          | US4026460A
              (en)
            
            * | 1976-05-03 | 1977-05-31 | The Dow Chemical Company | Valve type shipping bag | 
        
          | DE2831036C2
              (de)
            
            * | 1978-07-14 | 1984-11-15 | Windmöller & Hölscher, 4540 Lengerich | Verfahren zum Herstellen von mit Kreuzböden versehenen Ventilsäcken | 
        
          | FI981843L
              (fi)
            
            * | 1998-08-28 | 2000-02-29 | Upm Kymmene Corp | Paperinen venttiilisäkki | 
        
          | AU2002234998B2
              (en) | 2001-02-21 | 2005-07-28 | Tilia International, Inc. | Method for preparing air channel-equipped film for use in vacuum package | 
        
          | US20050034806A1
              (en) | 2003-03-05 | 2005-02-17 | Tilia International, Inc. | Method for manufacturing liquid-trapping bag for use in vacuum packaging | 
        
          | US7087130B2
              (en) | 2003-03-05 | 2006-08-08 | Tilia International, Inc. | Method for manufacturing a sealable bag having an integrated zipper for use in vacuum packaging | 
        
          | US7138025B2
              (en) | 2003-03-05 | 2006-11-21 | Tilia International, Inc. | Method for manufacturing a sealable bag having an integrated tray for use in vacuum packaging | 
        
          | US7517484B2
              (en) | 2003-03-24 | 2009-04-14 | Sunbeam Products, Inc. | Forming evacuation channels during single and multi-layer extrusion process | 
        
          | US7220053B2
              (en) | 2003-12-16 | 2007-05-22 | Sunbeam Products, Inc. | Flexible composite bag for vacuum sealing | 
        
          | US7534039B2
              (en) | 2004-07-22 | 2009-05-19 | Sunbeam Products, Inc. | Vacuum packaging films patterned with protruding cavernous structures | 
        
          | SE1750351A1
              (en)
            
            * | 2016-03-25 | 2017-09-26 | Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi | Progress to kraft sacks that are used for large industrial-purpose dust and granule product |