| Number | Name | Date | Kind |
|---|---|---|---|
| 1738411 | Welch | Dec 1929 | |
| 2822554 | Wenzelberger | Feb 1958 | |
| 4056858 | Weber | Nov 1977 | |
| 4516767 | Eskijian | May 1985 | |
| 4860395 | Smith | Aug 1989 | |
| 5487400 | Dawkins | Jan 1996 |
| Number | Date | Country |
|---|---|---|
| 405179837 | Jul 1993 | JPX |
| Entry |
|---|
| "Special Water Mattress", Waterbed Magazine, p. 24. |