| Patents for B43L 23 - Sharpeners for pencils or leads (1,940) |
|---|
| 08/06/1986 | CN85203988U 削笔器 Pencil sharpener |
| 07/22/1986 | US4601316 Electric pencil sharpener |
| 07/08/1986 | US4598478 In a heart stimulator |
| 06/10/1986 | US4593468 Convertible note pad and pencil sharpener |
| 03/26/1986 | CN85200773U Pencil sharpner with a rough inner wall |
| 02/05/1986 | EP0170451A1 Lead sharpener press button for propelling pencils |
| 01/29/1986 | CN85200750U Three-purpose stationery brush for students |
| 01/14/1986 | US4564351 Device for shaping the tip of a soft wax marker |
| 04/30/1985 | US4513798 Sharpener, specifically for cosmetic sticks |
| 03/26/1985 | US4506716 Pencil sharpener |
| 12/04/1984 | US4485862 Pencil sharpener |
| 02/14/1984 | US4431038 Actuating holder for combined electric eraser-pencil sharpeners |
| 09/27/1983 | US4406315 Pencil sharpener |
| 09/06/1983 | US4402354 Sharpener for cosmetic pencils |
| 05/11/1983 | EP0078512A1 Pencil sharpener |
| 06/08/1982 | US4333506 Pencil sharpener |
| 08/04/1981 | US4281698 Pencil sharpener |
| 07/08/1981 | EP0031470A1 Pencil sharpener with receptacle |
| 05/26/1981 | US4269523 Pencils and pencil caps |
| 02/03/1981 | US4248283 Cosmetic pencil sharpener |
| 12/09/1980 | US4237945 Apparatus and method for abrading pencil lead |
| 11/04/1980 | US4231405 Pencil driven mechanical pencil sharpener |
| 12/18/1979 | CA1068235A1 Combined pencil clip and sharpener |
| 10/17/1979 | EP0004786A2 Pencils and pencil caps |
| 02/06/1979 | US4138080 Hermetically self sealing gasket for high vacuum fasteners |
| 12/19/1978 | US4130592 Method for the preparation of chloroacetaldehydedimethyl acetal |
| 11/07/1978 | US4124048 Lead sharpener |
| 03/28/1978 | US4081010 Pencil sharpener for non-circular section pencils |
| 01/03/1978 | US4066109 Pencil sharpener with replaceable blades |
| 11/15/1977 | US4058281 High vacuum fastener |
| 10/18/1977 | US4054164 Pencil sharpener |
| 09/27/1977 | US4050487 Electric sharpener |
| 12/21/1976 | US3998253 Lead-pencil sharpener |
| 11/16/1976 | US3991798 Disposable device for sharpening leads or the like |
| 09/14/1976 | US3980114 Combined pencil clip and sharpener |
| 09/14/1976 | US3980113 Pencil sharpener |
| 08/10/1976 | US3973604 Single cutter pencil sharpener |
| 06/29/1976 | US3965949 Pencil sharpeners |
| 04/27/1976 | US3952784 Pencil pointer |
| 02/10/1976 | US3937239 Time delay mechanism for pencil sharpener |