Citada por|
| US4251164 | 27 Abr 1979 | 17 Feb 1981 | Pentel Kabushiki Kaisha | Tip for ball point pen | | US4524899 | 8 Abr 1982 | 25 Jun 1985 | Tokyo Sintered Metal Co., Ltd. | Method of manufacturing vent element | | US4603994 | 29 Abr 1982 | 5 Ago 1986 | Pentel Kabushiki Kaisha | Ball-holder of a ball-point pen | | US4795286 | 24 Ene 1986 | 3 Ene 1989 | Teibow Co., Ltd. | Pen tip structure | | US4842433 | 17 Jun 1987 | 27 Jun 1989 | Teibow Co., Ltd. | Pen tip structure | | US4993860 | 12 May 1987 | 19 Feb 1991 | | Applying device | | US5150979 | 16 Sep 1985 | 29 Sep 1992 | | Ball point pen with liquid ink | | US5383901 | 18 Oct 1993 | 24 Ene 1995 | Ethicon, Inc. | Blunt point needles |
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