|
| US4807907 | 12 janv. 1987 | 28 févr. 1989 | | Article of stationery |
| US5135437 | 24 juin 1991 | 4 août 1992 | | Form for making two-sided carbonless copies of information entered on both sides of an original sheet and methods of making and using same |
| 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 |
| US6280322 | 27 févr. 1995 | 28 août 2001 | | Single sheet of paper for duplicating information entered on both surfaces thereof |
