| Number | Name | Date | Kind |
|---|---|---|---|
| 3092520 | Buskirk et al. | Jun 1963 | |
| 4374188 | Campbell et al. | Feb 1983 | |
| 5372899 | Kuipers et al. | Dec 1994 |
| Entry |
|---|
| "High Technology Fibers" Part A--Handbook of Fiber Science and Technology/vol. III, Scruggs & Reed, Publisher: Marcel Dekker, Inc., 1985, pp. 335-347. |
| "Properties and Performance", Ryton, Phillips Fibers Corporation/Oct. 1989, pp. 1-6, 69-70. |