| Patents for B43K 24 - Mechanisms for selecting, projecting, retracting or locking writing units (2,268) |
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| 03/03/1992 | US5092701 Pen device to prevent ink from being vaporized |
| 02/20/1992 | WO1992002375A1 Pen-type devices |
| 02/04/1992 | US5085352 Dispenser for discharging material and having relatively rotatable male and female screws |
| 12/24/1991 | US5074694 Latch mechanism for retractable writing instruments |
| 11/27/1991 | EP0458326A1 Automatic writing instrument |
| 11/05/1991 | CA1291724C Twist actuated writing instrument |
| 10/17/1991 | WO1991015371A1 Mechanical pencil |
| 10/16/1991 | EP0452281A1 A ballpoint pen with a retractable writing tip |
| 10/15/1991 | US5056947 Dual refill-type writing utensil |
| 10/10/1991 | DE4011087A1 Function-controlled ball point pen - has key at housing point normally held by fingers of writer |
| 09/25/1991 | CN2085304U Tommy gun type pencil |
| 09/17/1991 | US5048991 Structure of driving ball refill for a ball point pen |
| 09/03/1991 | US5044805 Mechanical pencil |
| 08/14/1991 | CN1053770A Writing tool |
| 07/24/1991 | CN1053214A Dual writing element retractable pen |
| 06/26/1991 | EP0433572A1 Writing instrument including stamp |
| 06/25/1991 | US5026190 Dual writing element retractable pen |
| 06/25/1991 | US5026189 Writing implement with coaxial alternately usable tips |
| 06/19/1991 | CN2079118U Health chalk |
| 06/13/1991 | DE4038922A1 Ball pen or propelling pencil - has retraction mechanism operated by sliding tube |
| 06/13/1991 | DE4020209C1 Writing implement with four selectable colour tips - has rotary, sliding, actuating sleeve, acting as selector, in front section of tip retaining casing |
| 06/11/1991 | US5022772 Rotary knock type mechanical pencil |
| 06/05/1991 | EP0430387A1 Clip operated retraction mechanism for a retractable tip writing instrument |
| 05/30/1991 | WO1991004872A3 Dual writing element retractable pen |
| 05/08/1991 | DE3936549A1 Two-colour propelling pencil - has pinions on lead holders rotating in internally-toothed driving sleeve |
| 04/17/1991 | EP0422380A1 Writing instrument |
| 04/10/1991 | EP0421937A2 Retracting writing instrument |
| 04/02/1991 | US5004364 Device for advancing and retracting writing element in writing instrument |
| 03/27/1991 | WO1991004872A2 Dual writing element retractable pen |
| 03/12/1991 | US4999017 Multi-color writing utensil |
| 02/26/1991 | US4995750 Clip-operated retraction mechanism |
| 02/16/1991 | CA2018305A1 Propelling pencil, especially for large diameter black or coloured leads |
| 02/12/1991 | US4991988 Component writing instrument having retractable cartridge |
| 01/29/1991 | US4988227 Writing means |
| 01/17/1991 | DE3922562A1 Fluid dosing atomiser system - has outlet valve with float to control feed passage to tank |
| 01/10/1991 | DE3921525A1 Ball pen - has retractable writing tip which is actuated by moving pen clip radially outwards |
| 01/10/1991 | DE3921187A1 Ball pen with protective housing for ball tip - has elements to retract housing to bring ball tip into use |
| 01/09/1991 | EP0407002A1 Device for advancing and retracting writing element in writing instrument |
| 01/09/1991 | CN1048354A Multirow writing-core writing-drawing pen of automatical changing core |
| 01/03/1991 | CA2009920A1 Screw adjustment mechanism with pre-set backlash |
| 01/01/1991 | US4981382 Clip actuated latch mechanism for retractable writing instruments |
| 12/25/1990 | US4979839 Mechanical pencil having an automatic lead extending mechanism |
| 12/19/1990 | EP0402558A1 Extensible body ball pen |
| 12/11/1990 | US4976561 Writing tools |
| 11/27/1990 | US4973179 Clip actuated latch mechanism for retractable writing instruments |
| 11/20/1990 | CA1276591C Mechanism for extruding and retracting a writing member of a writinginstrument |
| 11/07/1990 | EP0395973A1 Writing instrument |
| 11/06/1990 | US4968168 Ballpoint pen with clicking |
| 11/06/1990 | US4968167 Combined writing tool |
| 10/31/1990 | EP0394511A1 Multi-lead writing apparatus |
| 10/30/1990 | US4966483 Valve operating mechanism |
| 10/16/1990 | US4963048 Note pen device |
| 09/27/1990 | DE3908960A1 Ballpoint pen |
| 09/26/1990 | EP0388632A2 Writing instrument |
| 09/11/1990 | US4955739 Mechanical pencil having side push button actuated lead advance |
| 09/05/1990 | CN1045063A Non-sharpenning pencil |
| 09/04/1990 | CA1273605A1 Writing instruments |
| 08/29/1990 | EP0384452A2 Multiple colour writing instrument |
| 08/22/1990 | EP0322550B1 Writing instrument with two ball point units |
| 08/22/1990 | CN2060729U Improved writing-core feeding mechanism of propelling pencils |
| 08/16/1990 | WO1990009288A1 Writing appliance that closes automatically after a given time-interval |
| 08/16/1990 | DE3904578A1 Schreibgeraet mit zeitgesteuerter, vollautomatischer kappe Schreibgeraet with time-controlled, fully automatic cap |
| 08/16/1990 | CA2045668A1 Writing appliance that closes automatically after a given time-interval |
| 08/14/1990 | US4948285 Ball point pen with two cartridges |
| 07/25/1990 | EP0378724A1 A combined writing tool |
| 07/24/1990 | US4943175 Feed mechanism for a writing device |
| 06/13/1990 | DE3922777C1 Pen with retracting tip - has tip moved backward and sideways and brought in contact with sealing ring |
| 06/13/1990 | DE3841746A1 Writing device |
| 06/06/1990 | EP0371135A1 Extrusion member |
| 05/30/1990 | CN2057617U General ball pen |
| 05/29/1990 | US4929107 Swing-type mechanical pencil |
| 05/23/1990 | EP0369995A2 Dual refill writing utensil |
| 04/26/1990 | DE3835679A1 Insert stick, in particular cosmetic stick |
| 04/17/1990 | US4917519 Writing instruments with rotatable wheel actuator |
| 04/17/1990 | US4917518 Automatic pencil |
| 03/27/1990 | US4911569 Mechanical pencil with a fluid actuator |
| 03/14/1990 | EP0357833A1 Writing implement comprising leads |
| 02/07/1990 | EP0353379A2 Mechanical pencil having an automatic lead extending mechanism |
| 01/25/1990 | DE3921822A1 Painting or writing instrument |
| 01/23/1990 | US4895467 Rotary knock type mechanical pencil |
| 01/11/1990 | WO1990000118A1 Painting or writing implement |
| 10/25/1989 | CN2046440U 不用削的铅笔 Do not cut the pencil |
| 10/18/1989 | EP0337447A1 Mechanism for put in and out the head of writing shaft in a writing tool |
| 08/31/1989 | DE3806221A1 Mechanism for writing instruments and writing instrument equipped therewith |
| 08/22/1989 | US4859103 Self-sealing retractable writing implement |
| 08/16/1989 | CN2042795U Auto-push type chalk clip |
| 08/10/1989 | WO1989007078A1 Extrusion member |
| 07/20/1989 | DE3800558A1 Manual writing instrument |
| 07/19/1989 | CN2041256U Projecting and locking mechanism for clip-type pen |
| 07/05/1989 | EP0322700A1 Writing means |
| 07/05/1989 | EP0322550A1 Writing instrument with two ball point units |
| 07/04/1989 | US4844640 Simplified retractable tip writing instrument |
| 06/28/1989 | EP0321581A1 Writing utensil |
| 06/27/1989 | CA1256403A1 Writing device with multiple writing element |
| 06/20/1989 | CA1255963A1 Hand printer for marking tickets |
| 05/24/1989 | DE3737000A1 Push-button ball point pen with integral pusher |
| 05/17/1989 | EP0316007A2 A valve operating mechanism |
| 05/10/1989 | EP0315337A1 Mechanical pencil |
| 04/12/1989 | CN1032311A Writing implement with writing unit enclosed in a pincers-acting body |
| 04/06/1989 | DE3732139A1 Writing instrument, especially a ball-point pen |