1
Alfred Doderer Winkler: Apparatus for making reusable adhesive envelopes. Winkler & Dunnebier, Kokjer Kircher Bowman & Johnson, July 4, 1995: US05429576 (68 worldwide citation)

A reusable adhesive envelope and a method and apparatus for making same. The envelope includes a pouch adapted to receive the contents and having an open edge. A flap is mounted adjacent this open edge and may be folded about a flap fold to close the pouch opening. The exterior of the pouch mounts a ...


2
Alfred Doderer Winkler: Method and apparatus for the attachment of clasps to letter envelopes. Winkler & Dunnebier Maschinenfabrik und Eisengiesserei KG, Collard Roe & Galgano, February 19, 1991: US04994010 (53 worldwide citation)

There is provided a method and apparatus for the attachment of clasps on letter envelopes incorporated into a machine for the manufacture of letter envelopes. The clasps, at the conclusion of the folding operation of the envelope machine, following the folding down of the lateral flaps of the envelo ...


3
Alfred Doderer Winkler: Method and apparatus for forming clasp envelopes. Winkler & Dunnebier, Kokjer Kircher Bowman & Johnson, February 16, 1993: US05186705 (1 worldwide citation)

An approved method and apparatus for forming clasp envelopes. The apertures extending through the top and bottom panels of the envelope body and the clasp receiving aperture extending through the top flap are formed after the envelope has been completely assembled save for the folding of the top fla ...