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| US5137494 | 16 mars 1990 | 11 août 1992 | | Two-sided forms and methods of laying out, printing and filling out same |
| US5154668 | 22 mars 1990 | 13 oct. 1992 | | Single paper sheet forming a two-sided copy of information entered on both sides thereof |
| US5197922 | 13 nov. 1989 | 30 mars 1993 | | Method and apparatus for producing two-sided carbonless copies of both sides of an original document |
| US5224897 | 29 juin 1992 | 6 juil. 1993 | | Self-replicating duplex forms |
| US5248279 | 16 déc. 1991 | 28 sept. 1993 | | Two-sided, self-replicating forms |
| US5395288 | 24 sept. 1993 | 7 mars 1995 | | Two-way-write type, single sheet, self-replicating forms |
| US5398867 | 22 nov. 1993 | 21 mars 1995 | | Combination paper and envelopes formed on a continuous paper web |
| US6280322 | 27 févr. 1995 | 28 août 2001 | | Single sheet of paper for duplicating information entered on both surfaces thereof |
| US7201305 | 9 juin 1999 | 10 avr. 2007 | | Postal outgoing and reply envelope form system |
