|
| US4807909 | 3 sept. 1987 | 28 févr. 1989 | Promo-Ad Canada Ltd. | Prescription assembly |
| US5048869 | 8 janv. 1990 | 17 sept. 1991 | Productive Environments, Inc. | Hypertext book attachment |
| US5316341 | 8 mars 1990 | 31 mai 1994 | Productive Environments, Inc. | Hypertext book attachment |
| US5380043 | 16 mars 1989 | 10 janv. 1995 | Productive Environments | Hypertext book attachment |
| US5634668 | 23 nov. 1994 | 3 juin 1997 | | Information indexing method and apparatus |
| US6012594 | 22 déc. 1998 | 11 janv. 2000 | | Free-standing poster portfolio |
